Svbony Dielectric Diagonal

[@anjconsultant6832]

Bought one of these as I had some vouchers for Christmas - and needed a 90-degree diagonal. Had our first clear night last night and YES brighter and clearer. REALLY good thank you for this review, Jason!

[@smalloptics753]

You're more than welcome my friend . All the best for the new year.

[@markdavis4754]

Something that is so over looked when it comes to compression rings is they help keep collimation in check. With out a compression ring whatever is been clamped is been push to one side while with a compression ring its been squeezed into place in the middle. It might only been a very small movement but if you add a barlow as well I think the effect is quite noticeable.

[@smalloptics753]

Hello there, totally agree buddy, its something I have addressed in past videos.

[@Ajajambo]

That's a great tip! Especially when collimating on a star. Having the compression ring ensure the ep is nicely centered. Sometimes I use my Cheshire ep to get a good look at the system and again the svbony is perfect.

[@nekite1]

I bought one of these a while ago and I'm very happy with the quality.

[@paganphil100]

That's a good price.....I got one from William Optics which is virtually identical to this one except that it cost me £105 from FLO. I have a small (102mm) telescope so I need every bit of light that I can get and these dielectric mirrors certainly do the job.

[@txdave2]

Thanks for the info. I just ordered one from Amazon.

[@sakuntharanaweera2457]

Thank You so much Mr. Jason..❤🤘 I'll buy as soon as possible..❤ God bless you..! Clear skies..!

[@garyb6219]

Compression rings, great idea. I'm going to have to get one of those now. The thumbscrew could be unreliable at star parties when people mistakenly would grab at the eyepiece. Thanks for letting us know about this!

[@chrisgates4791]

Firstly, after retiring I bought a 105mm refractor about 18 months ago. I've found your videos very helpful as a lot of those out there are not really aimed at beginners on a budget. I started taking your advice on SVBony stuff. Bought an 8-24 zoom (which you don't like) :) and then 20, 9 & 6 x 68 deg EP's and plus a 15x72 deg . After a mishap I also bought this diagonal, whilst I am very happy with them all, I did get a beginners surprise, last night to see that Saturn seems to travel West to East across the Southern sky. :) I'll get used to it I suppose. Keep them coming. Thanks again.

[@timodell5728]

The ring method of securing eyepiece tends to keep eyepiece straighter and light path straight. Better view when path remains centered.

[@LoboSolitario.__]

Hi, I just wanna say ive been using alot of your videos (mainly on the sv105) I just wanna say thanks. You explain very well and I'm not sure if its the accent but you keep reminding me of Brain Cox with how you talk, it's very pleasing to listen to you talk haha. Have a good day sir!

[@fazergazer]

Another advantage of dielectric vs. prism diagonals. Prism types are ok with F7 or slower scopes, but with faster scopes they can produce color dispersion as the light rays are at a steeper angle with fast scopes. Here a mirror diagonal saves the day. Doesn’t contribute to chromatic dispersion❤

[@gladiatormaximus4913]

I’m tempted to try that diagonal with my 70 m 400m focal length telescope

[@glennnorwood21]

Great review!! I was just on Amazon looking for an affordable upgrade for my recently purchased Celestron Omni 102 AZ.. and was basically overwhelmed by the number of choices. Especially since I’m new to this and don’t really know a lot about it. I saw this particular diagonal listed before I watched this review.. but still wasn’t sure. Now I am sure.. and I went ahead and ordered one.

[@lukeboy61]

I've just started with astronomy and I'm really liking your channel. I just about made out a faint smudge that was andromeda last night. I'm hoping to spot the new comet Nishimura one day soon

[@oninoyakamo]

One thing to remember, especially for MCT & SCT owners because of their long focuser travel, is a diagonal isn't mandatory. No matter how good the reflectivity, if it doesn't provide ergonomic benefit on your target and you have enough back-focus without it, removing the diagonal and viewing straight-through will always provide brighter views.

[@endautrestermes]

Nice tips for these types of telescope; Japanese are purists in that department ;) However for 90% of European population, light pollution is too present to allow viewing anything too low in the horizon unfortunately. And I won't try aiming around the zenith without a diagonal ;)

[@NuttyPotato]

lol i would need a 2m long tripod to look up

[@IonutNedelcu]

Thank you for the review. I've been looking at this exact diagonal to replace the one that came with my telescope. With regards to SVBONY, I have 2 barlows that were given to me with the telescope (both svbony) and I'm not sure of their quality but I don't have anything to compare them with. The image quality takes a huge hit with the 2x barlow (the other is a 5x which is essentially useless).

[@kevinbyrne5037]

Just ordered one, thanks for the review

[@jeffroach5716]

I have the 1.25” on my 50mm Svbony finder scope and 2” version on my 127mm refractor. Both are great. The 2” has a potentially unique advantage as the telescope side tube is fully threaded internally which allowed me to cut the tube to get me back into focus when I added a 2” Astromania filter wheel. The dielectric diagonal supplied with my telescope was only threaded about 10mm deep and of course the body of neither diagonal was threaded to 48 mm where I could have used an off the shelf extension.

[@Medicated1]

Good shout, I need to change the diagonal out of my skywatcher 102 SkyTravel. The 45 degree diagonal they use while being ok for terrestrial, make it back breaking for targets at zenith in the sky. I'll pick up one of these soon. Thank you sir.

[@AtlanticCanadianAstronomy]

I just kneel on the ground when using the 45. My 90° just arrived today. Best of luck to you! Many clear nights for you hopefully

[@davek12]

I'm glad it's good. I bought one to go with my also Svbony 105mm Mak. I haven't used it yet because of weather here. I checked it yesterday after reading online and mine is black inside, so maybe they've actually read what people wrote and improved.

[@smalloptics753]

Maybe that is the case because mine is also flat blacked inside. Thanks for watching my friend 🙂

[@iansteane2586]

Thanks for the tip Jason. Just picked one up on a Prime day deal for £46 😃

[@patrickmcdaniel2845]

I have one model down from this diagonal. Love the quality of the unit. One thing I wish that Svbony would do……..I have my childhood scope that uses .965 eyepieces. This diagonal has a nose piece that unscrews. I would love to see them release a .965 nose piece so that I can use this as a hybrid diagonal. I emailed them about this and never heard back from them. Perhaps you can make this suggestion as well. I think that a lot of folks with older scopes would jump on this accessory if the price is reasonable.

[@robertbryce7626]

Just bought a slightly used Celestron CPC 1100 and it came with a Zhumell 2" 90 degree coated mirror diagonal. Cannot find anything about this one, but is sure resembles all the features you discuss about higher end diagonals like the interior coating, threaded for cameras and filters, compression ring and such. No part number on it that I can find, but it looks remarkably like the Orion 2" star diagonal. What can you tell me about this diagonal?

[@ronm6585]

Thank you.

[@MrLongy1970]

Was going to upgrade diagonal on my nextstar 6se with the celestron dialectric at £150. Is the sv bony dialectric a better option at 1/3 of rhe price. Currently £47 on amazon?

[@dish8690]

Thank you for the Very Informative Vids. Beginner at this I just purchased a very nice used Meade ETX 60 to get started. Will this possible fit a Meade ETX 60 ? Or what would suggest as upgrading abit.

[@typhoonnamikaze1567]

Do another "targets to find" video especially for this summer, requesting for Messier objects to find near Sagittarius ♐.

[@smalloptics753]

Stay tuned loads more targets to find coming soon my friend 🙂

[@rockethair]

​@@smalloptics753looking foreword to it!

[@stuartclarke9241]

Jason I think your videos are brilliant I'm about to purchase the skywatcher explorer 130m been looking at it for a while now and watching your videos has prepared me in expectations and ease in getting set up for sky watching! Do you think this is a good investment for a beginner like me I've never used a telescope before so everything is new to me?

[@smalloptics753]

Hello there, thank you my friend.. Yes I own that very telescope and they are great for both beginner and seasoned astronomers.. Enjoy your new telescope buddy.

[@stuartclarke9241]

@@smalloptics753 Thankyou, will you be partaking in any more live streams in the near future?

[@endautrestermes]

Great advice, thank you so much ! Do you have any alternative in the same price range ? SVbony is hard to beat in their value prop, but I try to stay away from buying on Amazon.

[@avt_astro206]

Another Great Review Jason! My old Refractor had such a Poor Diagonal. Like a Piece of Paper, with Paint, lol! That looks Like Great Tool!

[@smalloptics753]

Hey Avanteesh thank you my friend, yes they are fantastic for the money.

[@rakitakhan]

These are available thru Aliexpress. I just got one for $14.45 US. I had previously got one from Amazon for $45ish. I'll have the Aliexpress order next week.

[@Dackelvamp]

Small Optics ... also known as SV Bony Teleshopping 🤣

[@midnightprowler243]

Just watched your video on the svbony dialectic diagonal, I have the same scope as you sky watcher 130/900 but then read in the blurb on Amazon it is not suitable for reflective telescopes? My main interest is Astro photography, yet when you watch your videos you always say not suitable for Astro photography, if it isn’t can you say what is?

[@napke8571]

I have a simmilar dielectric diagonal from Artesky, around 79 Euro, major upgrade to any scope indeed!!

[@starsandnightvision]

Would it be possible to screw a smal night vision camera on this thing with an adapter? I'm thinking to combine night vision and a telescope.

[@smalloptics753]

Hello there. Great idea, even though I have never tried it I'm sure if you could get the right adaptor it would work.

[@OogaBoogaman7]

Hello! I just bought a 50080 vultus (it’s dutch) telescope. My question is, is it a good telescope? The lenses it comes with are 25 and 10mm eyepieces and a 4mm aspheric eyepiece and a 3x barlow lens, its focal length is 500mm and the apature size is 83,2 mm and (using your method of calculation) it has 375x zoom. So yeah, is it a good beginner telescope and what other lenses should i buy?

[@EulysesTuya]

👍

[@edufau815]

Be careful when disassembling the Barlow lens and screwing it between the focus tube and the diagonal, we must consider that in this case we are altering the multiplying factor of the Barlow lens. The nominal magnification factor of a Barlow lens is calculated based on two things: the eyepiece will always be placed at a certain distance; and in the focal length of the Barlow lens itself. The multiplying factor is proportional to the distance from the lens to the eyepiece, and since the focal length of the Barlow lens does not change (no matter where it is placed), we can say that as the distance to the eyepiece increases, the multiplying factor increases, and vice versa. If between the Barlow lens and the eyepiece we put such an element as a diagonal, which somehow "extends" the path of light, then most likely we are increasing the distance between the eyepiece and the Barlow lens, relative to the native Barlow distance (which we can measure ourselves, since it roughly corresponds to the hollow part of the Barlow tube), so we are also increasing the magnification factor. And if we increase it, we may run the risk of viewing at inappropriately high magnifications, or experiencing disturbing visual artifacts or aberrations in the field of view. For this reason it is often recommended to place the Barlow lenses behind the diagonal.

[@donloughrey1615]

Good 👍

[@andrianosvasiliadis6960]

What eyepieces do you use for your 130 mm apeture and 900mm Focal length telescope?

[@pierspinelli8352]

Hello, im kinda new to telescopes in general, tho i already got one, it's a bresser ar-102xs/460, my aim with it is to do astrophotography and ive got an eq mount aswell, the only problem is atm what kind of eyepieces to buy, because i wanna start first to do planetary viewing and then proceed to dsos observations, any tips about which eyepieces or barlows to see fairly well jupiter and saturn? Help im desperate😢😢😢

[@gecko-sb1kp]

I just wish they would turn the street lights out at 10pm like they did when I was a kid. Now they were starry starry nights. And my eyesight was probably better...lol. Those were the days of stargazing. Laying in a sleeping bag on the back lawn between mum and dad on hot summer nights looking up into an ocean of stars. Trying to find the USS Enterprise...

[@geoffreyevans1549]

Hi Jason. Am I right in saying the diagonal is for refractors only?

[@smalloptics753]

Hello Geoffrey yes and also Maksutov-Cassegrain type telescopes too.

[@A0111.]

... and for SCT, and RC scopes, but it's better to invest to 2" diagonal, if your scope supports it.

[@cdz9400]

When will your next video be?

[@ivanmikov4143]

is this better than the one which came with my 127slt?

[@kevinoverbeck4250]

I wonder that myself.

[@frize1994]

hey everyone, I have a 70mm celestron, is it worth to buy this diagonal? Or its just a waste of money for a beginers telescope? thanks :)

[@3dfxvoodoocards6]

Yes it’s worth it, with this one you will get 10-15% more light than with the one delivered with your telescope.

[@demej00]

I have one with my 90mm refractor.

[@astroslap]

if only SVBony was more spread in Romania. It's quite rare to see in an astro shop one.

[@renato575]

Guys please Help me, i haver a dobsonian 6, and i buy a dialetric diagonal , and when i put on eyepiece and telescope, i cant see nothing, just blury.. i already try everything..

[@edufau815]

You must save your diagonal for use in a refractor or a catadioptric, as Newtons are not set up to support diagonals. You see blurry because you can't focus correctly, since you lack intrafocus. In fact, the observation position in a Newton is usually very comfortable without the need to use a diagonal.

[@robertsonsid]

I like my Celestron 91145A prism Star diagonal. Celestron has been supplying them with telescopes for decades. Get an Affiliate link for your product reviews so we can help support your channel.

[@BrightonandHoveActually]

A couple of months ago I purchased a similar one of a different make from the South American River. The side panels on mine were not blackened on the inside but I took them off with an Allen key and used car primer and matt black spray paint to correct that. and saved myself about £15. A significant improvement in image quality compared to my prism diagonal but remember that the image is reversed left to right, which takes a bit of getting used to..

[@cosmonautsan131]

Sir, I have a problem, I use F70060 telescope, and when I locate jupiter or saturn I see the primary mirror inside the telescope, when I adjust the focus it turns into a white dot literally like this ( • ) I use these lenses: 32omni eyepiece and 2X barlow lens, I also tried with other lenses but nothing new the same issue

[@smalloptics753]

Hello there, sounds like you are not using enough magnification... With your current setup you are getting about 40 X.. When viewing the planets you do need quite a lot of magnification to have any chance of seeing detail or size.. Try a 12mm eyepiece with your barlow which will give you about 116 x... Its important though not to use to much magnification every telescope has it's max and the maximum power for your telescope is 120X.. Hope this helps. Clear skies 🙂

[@mattjohn7700]

I made one ,out of a binocular prizam. what I find it brilliant.

[@MrJames19676]

What is the main use of this bit of kit?

[@Arimaquinador]

I have svbony dialetric and aluminium versions, you can't tell the difference. Good diagonals, aluminium is much cheaper. For F10 and above I rather use a prism.

[@lornaz1975]

You should get affiliate links from these companies. After all you are advertising for them and there should be compensation as a result.

[@ranjitkoothuparambil9782]

can i use this dielectric diagonal on 90/900mm refractor?

[@smalloptics753]

Hello there. Yes, it would be perfect.

[@ranjitkoothuparambil9782]

@@smalloptics753 Thank you!

[@xro5841]

Should have better explained why "Dielectric-Coated". I did a little research cause I did not get the 99% reflective idea. Just assumed a good mirror is, a good mirror, and all were about 99% (and all Good one's are). BUT - Dielectric-Coated = "In general", "dielectric coatings are harder, have higher reflectivity and higher damage thresholds than metal coatings" took this from a website that explained it. Sold me. And they are not over priced, just because Dielectric-Coated sounds cool.

[@artyombeilis9075]

Small error: It isn't blackned inside so there is a chance that in lots of light there will be red reflections inside - but I never had problem with it. Most problematic diagonals are erect diagonals that have multiple reflection surfaces and frequently have both internal reflection. For me upgrading standard erecting diagonal to this dialectic was significant update.

[@smalloptics753]

Hello there, that's odd the one I have is completely flat blacked inside 🤔

[@artyombeilis9075]

@@smalloptics753 Interesting because it is one of the main complains about this particular diagonal. Many DIY unscrew the red panels and painted inside red parts. It was absolutely not that way before. Maybe they fixed it (finally)

[@artyombeilis9075]

@@smalloptics753 Are you sure? It is kinda hard to see (I checked right now)

[@MrEarbuckets]

@@smalloptics753 Same mine is blacked inside as well.

[@Cakebattered]

Just checked my unit and the interior walls are all blackened out.

[@bill5982]

I have one. I challenge someone to tell the difference between looking through it and your naked eye. For the price there is no reason to buy any other one.

[@hugohazendonk340]

I bought one. Open it up. Its red inside and will add false colour. Need to paint the inside matt black. Typical of svbony its a branding house that doesnt understand the basic of optics.

[@smalloptics753]

You must have one of the old versions I can assure you that they are now fully mat black inside.

[@brenthann2623]

hello my friend, as always i loved your video. an affiliate link wouldnt be a bad thing. it would be a simple way for us to help support your channel. i put quite a bit of stock in your opinions and a affiliate link would be an easy way to find your "favorite" things.