Oversampling explained like you’ve never heard before.

[@DylanODonnell]

Cyberskunk over on /r/astrophotography discord quite rightly pointed out that for the "critical sampling" 2x2 pixels I showed in my drawing that's actually 2x sampling, not 4x. The "5x-7x F ratio" rules push you to 3-4x oversampling, but if you want to aim for "critical sampling" which is what I believe is best, then you should aim for 2x oversampling in the calculator. Some people swear by the 7x F ratio rule (4x oversampling) .. maybe they have better seeing than me! But somewhere in that 2x - 4x oversampling ballpark is probably fine.

[@kenkoskela3357]

Hi, Dylan - Thanks very much for making this video which is helpful as I am choosing my planetary setup. I want to make sure I understand this comment. Does this mean that on the bintel calculator I should be aiming for Oversampling of ~2.0? When I do, I end up below 5x. For example, I enter my ASI678 which has Pixel size um2 and my Celestron HD9.25. I get to 5x with no barlow and would get to 7x with a theoretical 1.4 barlow. On the bintel calculator, entering a 1.5 barlow (there is no 1.4) I am at 4.22x on the oversampling which sounds about right for 7x. To get to approximately 2x on the oversampling calculator, I need to add a 0.7 reducer, which brings me below 5x even. So, it seems I should still be aiming for 4x in the sampling calculator to get to 7x ratio? I am probably misunderstanding something. :) Thanks!!!!

[@DylanODonnell]

2-4x oversampling is the sweet spot. I reckon 2x but if you have great seeing you can get away with 4x :)

[@bradleypout1820]

Great video, mate! I love living vicariously through your astrophotography adventures. Even though I can't afford all the fancy equipment myself, it's still so much fun and entertaining to watch! Thanks for sharing your passion with the world.

[@DylanODonnell]

Cheers Brad!

[@chris091090]

​​@@DylanODonnelldoublecheck your f-stop multiplications? - its not a linear scale - doubling light gathering isnt double the f-stop number. (F-stops can also be measured in full, half or thirds of a stop, where 1 stop always equals double the light) For 'normal photography', a 1.4x teleconverter reduces light gathering by 1-stop and a 2x by 2-stops. Assuming the same rule applies to barlows, thats F22 and F32, so your maths is only out by 1/3 stop.

[@DylanODonnell]

Hi @@chris091090 ! Do you mean something on the calculator or the 5x rule in general? Because the "rule" isn't my invention but it's not shorthand for light gathering power but sampling and focal length so people don't have to work out max resolving power and just use the F-number as a general shortcut.

[@TheAntibozo]

Not doing any astrophotography these days; too much tree coverage where i am. I watch your videos just to beef up my knowledge for those nights some time in the future when i get back to the hobby, but also i watch because they are just plain entertaining. 🐿

[@DylanODonnell]

Huge compliment .. thanks !

[@ahmadhasan3258]

Dylan, you have explained the one concept I hated approaching and touching because it was soo confusing! Well done!! Do make sure to add something about sampling in the title so those who are looking this up know to go to your video

[@DylanODonnell]

Good idea .. thx !

[@TiKevin83]

When I looked into this before what I had researched was that you want the Line Pairs Per MM of the lens/telescope to know the analog sampling limit, then the nyquist limit of the digital resolution needed to capture that analog information fully would be 2*sqrt(2) or ~2.83 times the analog limit, as it would be the hypotenuse of the normal nyquist limit of 2x in both dimensions. If your camera is one shot color instead of monochrome I think that just means needing to dither and drizzle stack to have the full resolution of the camera covered in all colors, not needing any actual additional image resolution. For my Roki 135 the LPMM has been measured at just above 45 at f2.8 which I usually use which would give a target of 127.35 digital image space resolution, and the sony a6100 I use has an image space resolution of 128.2 lp/mm, so the camera is nearly perfectly suited to the limit of the lens.

[@NautilusCL]

Thanks for the explanation of the rule! I recently bought a QHY294MM, which is a deep space camera but I tried it with Jupiter just for kicks. I got very good results with my Celestron C6N! The best image of Jupiter so far. Now I want a planetary camera, do you think it is better to stick to mono or use a color camera? Considering I already have the filter wheel and LRGB filters 🤔? Greetings from Chile! (southern sky is the best sky 😎)

[@DylanODonnell]

Definitely Mono all the way! You won't regret it :)

[@jonservo]

It’s nice to see someone going into more depth on this. There isn’t a whole lot out there on this subject. I’m trying to find a dedicated astrophotography camera for my setup. I have a 90mm f10 refractor, and a 150mm f4 Newtonian astrograph (I got it cheap from someone in my area). I’m trying to get something to start imaging the moon and planets that can also dabble in the deep sky objects and possibly become a guide camera eventually. It’s not easy navigating all the options available, especially since there aren’t a lot of reviews on all the cameras out there. Of course I see zwo everywhere, but these qhy cameras caught my eye recently

[@DylanODonnell]

Yeh I’m loving the qhy stuff .. zwo stuff is good too but I’ve always found the build quality just slightly better with qhy. The adapters are generally easier with zwo .. qhy adapters can be confusing:)

[@Jdub8025]

Love the videos and calculator. It would be nice to see some of the newer William Optics refractors on the calculator though. Like the Gran Turismo 81 WIFD. GREAT VIDEOS

[@matadorbeagles1120]

Thanks for the explanation and update to the calculator! Do the same oversampling recommendations apply to lunar imaging as for planetary imaging?

[@DylanODonnell]

Yes if you’re going for small details, craters surface stuff :)

[@ericknudson2387]

I’m gonna check out that calculator. I was trying to learn all this a few months ago and got overwhelmed and decided to save it for a week where I had more time. Thanks for making it easy!

[@aw7425]

Thank you Dr Dylan. Snowing here in Colorado, no Astro until mod next week….we hope, clear skies

[@BariumCobaltNitrog3n]

Good info to have for the camera but what about exposures and stacking and processing and...I'll probably just use my Pixel 6 in slow motion and slowly turn the knob.

[@DylanODonnell]

Yeh I had a section but the video was getting too long! (I'll demo when I have good seeing)

[@BariumCobaltNitrog3n]

@@DylanODonnell okie dokie

[@ziggyfrnds]

Always a great day when Dylan uploads! I'm in sydney and the forecast says clouds for the whole week ahead :( Hope you get clear skies in Byron bay mate! Can't wait to see results with your new camera

[@DylanODonnell]

We’re having the same weather. It’s killing me!

[@garunixreborn2416]

this el nino is a lie

[@DylanODonnell]

@@garunixreborn2416 worst El Niño ever. 0 stars.

[@SKYST0RY]

Here in Nova Scotia it is endless cloudy night season.

[@DylanODonnell]

Hasn’t been so good here either !

[@davejenkins8524]

No Astro right now ! Everything is in boxes, Moving to New Mexico for clearer skies... Some DSLR stuff, but not much.

[@DylanODonnell]

Clearer skies !

[@OlliesSpace]

This is cool information thanks Dylan, Ive been using the X5 to now so good to see this explained. BTW I think the ASI 432 camera has incorrect pixel size on the Bintel Calculator. Cheers Ollie.

[@DylanODonnell]

I'll check it.. thanks!

[@DylanODonnell]

fixed!

[@swagonman]

Regarding over/under sampling and resolution, doesn’t the scope’s spot diagram come into play? On the small refractors I’m considering for purchase for DSO imaging, almost all have spot diagrams larger than their airy disk size, but nobody seems to ever mention this with regards to sampling. Am I missing something? At high f numbers like the C14 or any planetary setup, I guess the airy disk becomes much larger, so maybe their spot diagrams are smaller and don’t matter. But I haven’t checked this. Coming from terrestrial photography, almost every lens review does cover the lens’s sharpness. But I generally see this lacking in telescope OTA reviews and on suggestions about pixel over/under sampling. I’m just surprised.

[@johncooper9746]

As a newb learning , I will have to watch this a few more times , but getting the most out of your glass seems worthwhile

[@skesinis]

This one was a real eye opener Dylan! Being on a Bortle 9 sky, I can pretty much only use my 5 inch scope just for planetary observations. Looking back at combinations I used in the past, your calculator I was oversampling up to 10x sometimes! 😂 I knew I was magnifying a blurry image, but I didn’t know by how much! On the other hand, this exaggerated magnification, helped me develop a stepper motor focuser using an Arduino, to focus accurately without shaking the scope, and some DIY vibration absorbing pads for the tripod. So, it didn’t all go to waste…

[@DylanODonnell]

Ahh I’m glad it helped! Sounds like your kicking ass :)

[@skesinis]

@@DylanODonnell I was trying to calculate the pixel binning or skipping that my Canon 90D does when it shoots 4K video. Do you normally divide the resolution of the sensor (i.e. 6960x4640) with the resolution of the 4K video (i.e 3840x2160) to get an approximation of it? This would give me about 1.8x2.15 or about 2x2. Would that be about right?

[@DylanODonnell]

Yeh 2x2 is probably a decent estimation it may be out by some overlap edge pixels or some other nuance but likely actually 2x2 binned.

[@skesinis]

@@DylanODonnell Thanks! Deciding to go for a dedicated planetary camera instead, is now down to the frame rate, since the Canon 90D can go up to 25FPS in 4K or up to 100FPS in 1080p.

[@laurence4282]

Thank you a lot for your video. I can confirm that the x7 rule is the best. Until late last year I used the x5 rule and when I heard about the x7 rule I bought a new camera with smaller pixels (zwo 662 mc). With my c11 I kept my x2 Barlow and with the smaller pixels (2.9microns vs 3.76 with my previous camera) I now have x7. Indeed I have made huge progress with my planets pictures.

[@crawfprof]

Thanks for the straight-forward explanation of oversampling Dylan. The new Bintel Setup Calculator is also excellent and incredibly insightful. It cleared up a few questions I had.

[@spacetechtips]

I'm trying to get into planetary photography, so this is helpful. Thanks!

[@martinsastrophotography]

Great video Dylan. I checked my setup….EdgeHD 11, 2x Barlow, ASI662MC (2.9um pixels)…..7x2.9=F20.3…I am at f/20. Happy days.

[@DylanODonnell]

Perfect!

[@DangeeksC]

So, just so we are clear. You did the calculator on the Bintel site? :)

[@DylanODonnell]

I did yep! I did all the tools on that website. Actually I did the whole website. :)

[@terrance_huang]

actually, by using Rayleigh Criterion, F28 has image side resolution of 28 * 550e-9 *1.22 = 18um, which is approx 4x of pixel pitch, 16x pixels(resolution), which is really necessary for Bayer CFA sensors. F20 is about 3x of pixel pitch

[@claudiotenreiro3111]

Hi Dylan, something did happen with your calculator, I did used it after you released this video, but now that I decided to buy a new camera...it is not showing the results...Hopefully will be back online. Cheers and nice and useful video.

[@aradani3]

Great video, but I still have something bothering me. I have a F5 750mm Newtonian I can use a camera with 3.76mu pixels and a 5X Barlow (F25 vs F26.3 for the 7x rule) or use a camera with 2.9mu pixels and a 4X Barlow (F20 vs F20.3 for the 7x rule) or buy a camera with 2mu pixels and a 3X Barlow (F15 vs F14 for the 7x rule) All these should give me similar results?

[@DylanODonnell]

Given similar good seeing, yep!

[@croenan]

Is there a way to add a scope to the list? Mine isn't there. 😢

[@DylanODonnell]

You can add the r-ratio and focal length manually :)

[@philkidd]

Okay, so very informative (although somewhat confusing, but that’s okay, I’ll just watch if a few more times). Thanks mate!

[@fszocelotl]

In my channel I have a video of a take I took of Jupiter with a point and shoot camera and a 3 inch newtonian reflector. I added a link to the image I got, which is at my FB page. In it, I got to oversampling to 0.36 arc seconds per pixel, and got hints of festoons... It was a lucky day.

[@stevendrexler6138]

Dylan you're amazing how you answer almost every comment! Very impressive!

[@DylanODonnell]

I try !

[@tobbler0ne]

There is a thing called ”eyepiece” on the calculator website.. Whats an eyepiece and what do I do with it?

[@Joshs4stro]

They're like the silica gel packets you get in the box, just chuck them.

[@DylanODonnell]

They’re like dust caps for when you’ve got the camera off the scope.

[@tobbler0ne]

@@DylanODonnellAh so thats where I was supposed to stick it..? Awkward..

[@Joshs4stro]

@@tobbler0ne Where'd you stick it? 😳

[@tobbler0ne]

@@Joshs4stro Well I read something about not looking at the sun and lets just say that there will be no sunlight for this bad boy..

[@rosscayley8773]

Thanks Dylan ..good info to know. A few years ago I used the 'old' Bintel calculator to select a new camera for my kit, but an instinct told me to ignore that advice and go for significantly more oversampling than the calculator recommended back then.....knowing I could always bin the pixels to get it into the reccomended Bintel 'sweet-spot' anyway....and so...I 2xbinned the pixels to get it into the Bintel 'sweet spot' right off the bat and it did deliver a pretty decent result- and very quickly. But then I unbinned it out of curiosity, doubled the camera resolution to native, and the result was nearly twice as good! And the upgraded Bintel calculator now explains why- my existing setup now plots bang on the 7x rule.....

[@DylanODonnell]

100% ! Was definitely DSO centric before so trying to make it clearer for the planetary crew now too :)

[@rosscayley8773]

​@DylanODonnell I don't know for sure, but I suspect a bit of supposed oversampling plays well with drizzling....the extra pixels are 'empty'.....but not completely 'empty'....

[@DylanODonnell]

@@rosscayley8773yes definitely .. I left out a whole section on drizzling because the video was getting long but that’s why 4x is the magic number. It’s the doubling from 1x1 to 2x2 that allows drizzling to infer the sub pixel data :)

[@carlosmiranda1592]

Nice to see the community change their focus from deep sky 🌌 $$$$ to planetary 🪐$$$. 🤔

[@steppen57]

But before I die, let me take one or two more pics of Jupiter. Great video. I have been trying to understand the right F/camera combination for a while and this video and the calculator just did the trick. Thank you!. My oversample is at 4.85x with the 2.5 Powermate. I could get 3.88 if I use a 2x Barlow. The question is, should I go for the 3.88 even if the image is a little smaller? Or do I keep using the 2.5 knowing that there's a .85 inefficiency? I wonder. I am happy with the quality of my images, albeit they are a bit soft. But don't look too dissimilar from your Jupiter image in your video. Now I know why too. And you are correct that planetary imaging is a hands-on/contact sport.

[@DylanODonnell]

Interesting :) I guess just know your images will always be a rock soft at that X but you can always make them a little smaller in post to sharpen things up. I’d go for the 2x though.

[@blobrana8515]

Fantastic first light image.

[@Mrpaulgs]

I look forward to your videos and enjoy the content. I have the same scope and I am trying to set up the image train for planetary imaging. What is in your image train? What is the piece that has the green lettering?

[@DylanODonnell]

Heya thanks! That’s the 2.5x powermate :) some of my older videos discuss the image train for planetary .. maybe the last Saturn one ?

[@olivierdamiron7279]

Lol!!! The hot cousin comment..... So random!!!! Good to see you again too DOD, it's been a while! Good to hear you are in fine form! Cheers! And the FU D&D dice.... Love it!

[@DylanODonnell]

Thanks Oliver!

[@91ABaker]

Trying to get a picture of the monolith around Jupiter.... I am sorry Dave I can't let you do that.

[@carvrodrigo]

Nice video sir!! We all were missing your tech adventures videos!

[@ryanmichaelhaley]

Wow, thank you for this! I will definitely check out your calculator and see what camera may work best for my setup! Kudos, sir!

[@DylanODonnell]

Thx Ryan!

[@craiglowery4427]

Outstanding video Dylan. I've been using the 5X rule with my F11 Celestron 14" Edge along with a 2X Powermate. My camera has 2.9um pixels. I thought I was oversampling but now not sure.

[@DylanODonnell]

Thanks! The benefit really only affects good seeing nights but it’s good to know your gear will be ready and primed for it :)

[@OhanSmit]

She didn't say anything anymore, after mentioning your name Dylan . . .

[@markf5175]

It would be great to see a comparison of your images at different sampling rates, for example, at 4x, 5x & 7x. Then separately stack the frames in say, Autostakkert and run a comparison of those as well.

[@DylanODonnell]

Yes but would only make sense if the seeing was the same on each so you’d have to change the image train three times in the night.. and seeing changes sometimes even quicker than that! But it would be a good test .

[@astroskyman]

Excellent explanation, thanks for posting.

[@DylanODonnell]

Thanks for watching !

[@joshuamuller9705]

All good here. Thanks for asking. And yes my cousin asked about you. Again🙄😄 Not the best weather here in Switzerland but I can get some hours in every few days😊

[@DylanODonnell]

Nice :) say hi for me.

[@The13rannon]

Best Astro videos on KZbin! Always makes my day! 🍻 I often go back and watch your older how to videos, like recently your firecapture video helped me snag a great shot of Jupiter and Saturn. Thank you! #ditherordie

[@DylanODonnell]

Hey thanks so much !

[@nethertamer9943]

Is 4.85x a little too mutch oversampling

[@DylanODonnell]

In theory yes, you’ll never get more detail just slightly soft results.

[@damienk2372]

As a planetary nerd i am deeply offended.............Just kidding im a snow flake everything offends me. My understanding was originally the 7x rule was for colour cameras because of their loss of resolution due to the bayer matrix and the 5x was for Mono cameras. But my 16" F4.5 and 24" F3.3 are at 8200mm (F20.2) and 9500mm (F15.5) for imaging and i don't change it regardless of type of camera. Seems to me though as long as you are somewhere in the ball park you will be ok with more than a few of my favorite images have been taken at 7000mm with the 16" at F16. Another great video mate. Damo

[@DylanODonnell]

Yeh the rabbit hole goes deeper for various wavelengths etc but I stand by my assertion that 4x critical oversampling is the goal .. and it’s only going to pay dividends on perfect seeing anyway :) so ballpark is fine.

[@damienk2372]

@@DylanODonnell Think the spam filter picked up my reply, after a trip to Bintel i found my sample rate on the 16" when at my desired 8200mm FL i am at 3.92x sample rate so i think we concur on this.👍

[@DylanODonnell]

Yes.. perfect ! Forget the 5x 7x fratio stuff .. 4x over sampling is where it’s at .. it just happens to correlate with 7x better than 5x which is why ppl use the rule of thumb but no need to use the rule if you can calc the sampling to several decimal places .. that’s perfect :)

[@astrosrscat]

Love the new calculator

[@DylanODonnell]

Hey thanks !

[@kelyho82]

Is that the Tim Henson signature Ibanez? 😮

[@Joshs4stro]

7:41 prove it.

[@DylanODonnell]

1, 2, um

[@billblanshan3021]

Very well done buddy! With new equipment purchases, you forgot to play the gear porn music, lol. That's the funny shit

[@DylanODonnell]

Hehehe

[@skylinevspec000]

Cool so when I did Jupiter and made it look fkn huge on the screen. I was right bout 4x :) happy days

[@tolman33]

Hey Dylan, I'm doing well thank you for asking. I hope you have been too! Pacific northwest near Vancouver has had some oddly clear weather so its been half decent recently, but that will change soon. My cousin did recently ask about that hot astrophotographer on youtube, I immediately thought of you but she gave a yeah naw and was talking about Trevor from astrobackyard. Sorry mate. Still #1 in my books though. Do miss the covid/hobo-esque hairstyle from years past, not gonna lie. Keep truckin on!

[@DylanODonnell]

Haha great to hear. Apart from your cousin. How dare she? Full hobo mode is setting in. Dunno how she can resist.

[@volens31]

Did you take the dog shit out of the bag first? 😉 Great vid as ever👍👍

[@DylanODonnell]

Oh no

[@drunk_astronomy]

What else can I say other then, excellent.

[@DylanODonnell]

Thx drunk!

[@roderickwho1983]

That was stuff I didn't know that I didn't know. Thanks Dylan. I now feel that I should grow some sort of beard. Just like you, (Or Trotsky).

[@DylanODonnell]

Yes comrade !

[@roderickwho1983]

I off to mobilize the proletariat. (Em that's a euphemism btw ;-) )

[@richhudnut5110]

Ha, you said eyepiece...! Yea yea I know the dice.... "very nice, loved that.."

[@DylanODonnell]

Shutup!

[@richhudnut5110]

And thanks for the Bintel tool, best one out there@@DylanODonnell

[@TheRhike]

Your video is great, if only you have made this video 2 months ago before i bought my gear!!, now you have create a need for a new Camera and a new Barlow, 😂😂

[@DylanODonnell]

Haha I’m so sorry !

[@DawgcityClev]

Who needs the know-it-all elitists forums on CN when this guy is breaking it down right here! 🤣

[@DylanODonnell]

To be fair I’m paraphrasing them .. a little … just with more sarcasm.

[@ohwell2790]

When planets rotate so fast even my Sbony cameras do a fine job and have gotten good images of Saturn and Jupiter . I have not used my telescopes in a least two years and are gathering dust. Just do not enjoy them anymore light pollution has become a real problem and do not have transportation to go anywhere . But enjoy your videos thou.

[@DylanODonnell]

Glad you enjoyed! LP won’t affect any planetary work you do.

[@Beta_soy_chad]

Yulla Habib, there is only one rule with photography, the rule of thirds. Also, no one cares about 5X or 7X. We only drink XXXX up here. Also, have you thought of getting a Ring doorbell. It never misses a capture….

[@anandarochisha]

Yeah..umm my cousin wanted me to mention that she still has a restraining order against You..but yes ..she still asks about You..

[@AstroDanno]

Isn’t 7x best for excellent seeing? That’s what I had read while digging into planetary setups. My seeing is usually dogshit around here anyways. 😂

[@DylanODonnell]

Hehe yep the “limit” is really the seeing but making sure your scope is at its limit anyway is good just in case a miracle occurs and you get perfect seeing :)

[@AstroDanno]

@@DylanODonnell I was running a celestron 8 with a 2.5x Barlow and the ZWO 224mc with 3.75úm. I think that gets me pretty close but man is it hard getting a planet into that tiny FOV! That’s the hardest part of planetary for me so far.

[@yeeeeeeeeeeeeeeeeeeeeeeeeeeeat]

5 minutes ago? Damnnnn im early

[@johnjewell219]

👍🇦🇺🐈‍⬛😎

[@vinylnumpty]

I just feel bad for not having a hot cousin... would thick / shallow cousins work?

[@DylanODonnell]

Bahaha

[@newzerozeroone]

I appreciate the info but it still didn't answer the core question...

[@DylanODonnell]

What do you want to know ?

[@DeanLouviere]

My cousin unfortunately doesn’t ask about you 😭😭

[@DylanODonnell]

God dammit

[@rudyastro]

Fancy seeing you here lol

[@huf67]

My hot cousin wants you to catch up on your child support !!!

[@DylanODonnell]

Who? *cough*

[@Astroduck44]

My “hot cousin” is a man btw, if that’s ok with you 😊

[@DylanODonnell]

No judgement :)

[@zorzevic]

Man can you tell my hot cousin to stop asking about you please? It's getting really annoying.

[@garunixreborn2416]

my setup gets me to 2.33x, so im guessing i should use my 2x barlow? But then again, manual tracking with 2400mm sounds like a lot of pain

[@FisTheDucc]

im manually tracking at 3600, its not at all

[@oocoder]

How come you look so fresh and alive.

[@DylanODonnell]

It’s not the cocaine

[@dumpydalekobservatory]

I must get some dog shit bags so I can create ambient lighting in the observatory & round the home what the hell lol, Great video mate I haven't done planetary in years maybe I will again someday though.

[@VintageBlacklist]

Lining my dome in individually addressable RGBW was one of my best, "why?" investments ever. Yes, it is ironic to have very bright RGB on an observatory, but is it always clear out? Nope, enjoy Kipp's scrolling eye effect on the dome. Cheers from Oakland Bay Observatory

[@DylanODonnell]

Yeh man .. lasers and flashing lights make everything better !

[@Astronurd]

I have been planetary imaging for years and I found that the 5x rule is a good guide for average seeing conditions however what you say is correct in that the 7x or capturing to your scopes resolution is indeed correct but it can only be beneficially employed under almost or perfect seeing conditions. For myself it simply means having both powemates and using either the 2x or 2.5x depending on the seeing on any particular night.

[@pavlikm85]

A cycle equals two pixels, not one. So it should be 200×200 pixels, not 100×100. Edit: actually times sqrt2 (for the diagonal), so 283×283.

[@deltacx1059]

1:23 thats what i did, it won't get you amazing results but if it's your first time go for it. I built my first telescope a year ago to try the whole astronomy/AP thing and my scope is a middle of the road type thing, it's about f/5.3 so it's not great for planets or deep space stuff but it works ok at everything.

[@johnellsphoto]

Great stuff, your star stuff, in the case, planetary stuff!

[@messier7849]

Correct. Planetary imaging is a totally different thing.😮

[@messier7849]

0%flashing in the vid. Cuts out. 😅😅

[@OnceShy_TwiceBitten]

If the result is as blurry as that, what a waste of time.

[@AstroQuest1]

Thanks for the video Dylan - excellent info. If I ever do planetary, maybe in a few years, I will hav a better understanding of what the Heck is going on. I especially like your week long continous camera experiment - shows how durable it is. Cheers !

[@JoeBob79569]

This is fantastic stuff. I just randomly pointed my 480mm scope at Jupiter last month, and of course it was very undersampled, and a blurry mess, and I was planning to stick a Barlow on it the next time. But these little calculations are fantastic, I'll definitely give them a shot. I have a 2x and a 5x Barlow, so I might do some calculations.. But to be honest I most likely won't do any calculations, I'll probably just try both of them and see how much of a mess the 5x is before switching to the 2x. And then do the calculations afterwards to see how I screwed up.

[@DylanODonnell]

Haha I use that method too.

[@angryBOT]

My hot cousin thinks astrophotography is boring :(

[@DylanODonnell]

What does SHE know anyway

[@angryBOT]

@@DylanODonnell true! She is a teacher. We all know how teachers think they know everything...

[@craiglowery4427]

Hi Dylan. I've noticed that some of the newest planetary cameras have pixel sizes around 1.4um. So I'm hearing planetary imagers say that now they don't need a Barlow and that their images are great because of less glass in the optical train. What is your opinion?

[@DylanODonnell]

Yep.. that's why you don't need a Barlow with them!

[@matte5810]

Hey mate I have a C9.25 With the ASI224MC and im trying to find the best Barlow based on your 7X rule if I go with a 2.5X Barlow it gets me 3.75X but if I go with a 3X Barlow it gets me 4.5X over sample. So my question is the 4.5X over sample pushing it way too far and best go with the 3.75X over sample or the 4.5X is still the better option?

[@hyparh]

3.75 will be better

[@robmailconway]

Dylan thanks for the calculator it helped to give me a better understanding. 👍 Also i know you like your music, i went to see the Queens of the Stone Age here in Ireland on Wednesday night and some of your country men were the support act The Chats" great concert 🤘

[@DylanODonnell]

Hell yeh! Love the chats boys :) I’ve got to see QOTSA a fair few times now too! At least 4 .. maybe 5

[@M42-Orion-Nebula]

I must say, your Chess skills are much stronger than I anticipated... (Also, great video!)

[@DylanODonnell]

Haha enjoy even when I lose !

[@gregmac8268]

You make me feel dumb but talk smarterer

[@DylanODonnell]

Haha!

[@zacharyhudson618]

i love you

[@DylanODonnell]

I love you too

[@cosmoscarl4332]

Love the 20 sided die!😂

[@DylanODonnell]

Critical hit!

[@LogansAstro]

Excellent explanation Dylan. Just tried out the calendar and it looks like the ASI533mmPro I will be adding to the Meade 10" should be a good fit with the 7x rule. By the way, my cousin said "Dylan who?" 🤣

[@DylanODonnell]

Haha how dare she

[@IvanVazquezS]

I did a similar calculation before buying my first amateur setup because I wanted to be portable and efficient. I got the skymax 127 and a QHY5iii715c camera, and apparently I was very right because my telescope Dawes limit is said to be around 1 arcsec and my camera is 0.19 arcsecs, so it's basically a 5x multiplier. With this I got amazing images using a 200 USD camera, a UV IR filter and a very cheap 500 USD telescope with alt az mount controlled from my phone :D, no Barlow and nothing extra needed!

[@mikabuck9866]

My telescope with 2x Barlow and the camera have are at 3.41x. So not the 4x your suggesting. However the 2.25x Barlow puts me at 3.84x, and a 2.5x Barlow is 4.27. What would be your recommendation or do you believe my current setup is ok? Excellent video by the way😊

[@DylanODonnell]

It's pretty close to fine .. the only difference will be when you have great seeing :)

[@mikabuck9866]

@@DylanODonnell thank you

[@wcoastsands]

The calculator upgrades are super helpful. Thanks!

[@astrolibrarian]

Great video! That QHY200 has fantastic UV sensitivity. You should give Venus a shot with it. I’d love to see how Venus looks with a Astrodon UVenus filter along with that camera.

[@DylanODonnell]

True!

[@Mohammed-zo3qq]

God i love your sense of humor 😂

[@DylanODonnell]

Thanks Mo!

[@deep_space_dave]

Thanks for the video Dylan! Perfect timing as I finally decoupled the mirror on my RC 8 and now it's collimated and ready! I plan to put my QHY5III715C to the test maybe even push it with a barlow! Also AutoStakkert!4 is in beta! Yes planetary is like a whole other hobby to itself. No guiding, super long F ratio, super fast cameras vs long exposures. Making sure your scope doesn't stare naked at the SUN at dawn! Now if only the seeing will cooperate 😕. What do you think about an ADC?

[@DylanODonnell]

Adc is recommended for colour imaging but I think k with those small pixel cams you might not even need the Barlow to hit the 4x sampling / 7x rule .. run it through the calculator and see

[@deep_space_dave]

@@DylanODonnell yes I see after running through the calculator I don't need a barlow. Thanks for creating this!