But star HALOS... ANTLIA 5nm dual band Filter - FOR RASA AND HYPERSTAR!

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[@CuivTheLazyGeek]

An interesting take from @lukomatico ! kzbin.info/www/bejne/Z4O0p2pqqbhoes0 Thanks to my Patreon for their early feedback on the video and for their support! If you wish to support me: www.patreon.com/cuivlazygeek

[@astrofalls]

I got some similar gradients too from my Oiii channel that went away when I enabled per channel flat frame scaling in WBPP. The R vs G+B channels are so radically different they don’t really work with one flat scaling number.

[@CuivTheLazyGeek]

Thanks for the tip!! I think I have that on already but I'll check :)

[@dumpydalekobservatory]

I've been waiting for a review of this filter very interesting results Cuiv as I'm looking for a narrower dual band filter for the RASA, the halos are putting me off a bit so for now I'll be sticking with the NBZ especially after seeing Luke & Bills comment below.

[@CuivTheLazyGeek]

Luke's video is very interesting! Such a different point of view!

[@-Jeremiah-]

Cuiv, I’m terrified of buying an expensive filter now that you’ve shown us that we need to test them. Have you found a service that will test m?

[@CuivTheLazyGeek]

No service that I know of... Some people have started building their own spectrometers for cheap to test filters...

[@TroyRubert]

I’m a complete noob and waiting on my dwarf2. I’m in the suburbs with street lights everywhere. Would a filter like this be useful for it? I hope this question even makes sense 😆

[@CuivTheLazyGeek]

The non-highspeed (e.g. standard) version would be a good tool, but you need to adapt a 2 inch filter to the 1.25 inch holder!

[@TroyRubert]

@@CuivTheLazyGeek I'm looking to get a couple of filters can you link any aftermarket ones you recommend here or in your next video on it?

[@endrihajdaraj130]

Hello this filter is also fine with canon? and for galaxies

[@CuivTheLazyGeek]

Should work with Canon cameras, but I'd recommend having the camera astromoded - it will work to get the nebular details of galaxies as well, but you then may want to get some broadband data too

[@lukomatico]

Very interesting video bud!! I'm about to create my own video on this exact filter too, it's really handy two of us have been able to test at a similar time haha 😀 Seems like a great filter, but with some halo issues in certain circumstances I've noticed! Thanks for sharing mate! Clear skies :-)

[@CuivTheLazyGeek]

Will be looking forward to your review!

[@N4GW]

I have both as well and the Antlia wins. Mine is the normal version

[@richards3192]

Hi Cuiv, you're probably familiar with the following but halos are quite complex issues and can be down to a bunch of reasons including the AR coating on camera windows, there's a couple of references worth reading up on, the Baader piece 'Halos viewed without prejudice' and Jim Thompsons 'understanding filter induced halos'

[@starsips]

I managed to score one of these filters when they launched. I highly recommend it! My use case; it was paired with a RASA36 and QHY268C. Results with the filter have been excellent!

[@CuivTheLazyGeek]

Excellent to hear!

[@yellowlynx]

I have a discussion with a dealer about difference between the high-speed version and regular version (not just ANTLIA, but also IDAS-NBZ) - my issue is that I have setups at F3 or faster, and regular setup at F5 or above. It will make no sense for me to buy two versions of them, so I was advised to use the regular one, because the light cone that got through won't produce the effect that is really significant.

[@CuivTheLazyGeek]

The IDAS NBZ has wide bandpasses so you right, UHS vs normal has almost zero impact. I personally would go (and have gone) with the normal version because it can be used so successfully at any speed. For tighter bandpasses, 7nm and tighter, the placement of the bandpass compared to the signal wavelength becomes critical, and varies from filter to filter of the same model! For something that's 5nm like the Antlia it becomes even more important. Using the standard ALPT on Hyperstar can be quite bad (I tested it) because then the outside of the aperture (which represents a large percentage of the total light gathering area) gathers only light pollution and no signal. It actually becomes better to mask the outside of the aperture a bit in terms of SNR!

[@siegfriednoet]

Very thorough review Quiv as always . I've been using an Alp-T filter for a while now but it produces halos, not so bad as the L-extreme but they are still there. So a few months ago I switched to an Optolong L-Ultimate 3Nm filter and must say that I was blown away of the better details, more contrast, .... and also almost no halos at all. But that 3Nm is very narrow, so star colors are completely gone. So have to shoot extra luminance for the stars.

[@CuivTheLazyGeek]

Thanks for the feedback! Yes the L-Ultimate looks great, but wouldn't work on Hyperstar!

[@danielm4703]

Hey Cuiv, thanks for this review. I know you said it should provide good results at just about any focal ratio. Do you think f/1.4 would be pushing it too far? I'm interested in getting this for my Sigma Art 105.

[@christopheguigot841]

bonjour,pour toi quel est le meilleur filtre anti pollution sur une camera couleur pour un hyperstar c11....merci beaucoup. france

[@CuivTheLazyGeek]

Ça dépend de tes préférences et de ta situation. Pour moi à Tokyo, dorénavant je vais utiliser le Antlia, simplement parce que le SNR est vraiment bien. Et les halos ne me dérangent pas plus que ça! Si les halos dérangent, alors une valeur sûre est le IDAS NBZ (UHS ou pas, les deux fonctionneront bien)

[@PopeAstro]

Sold!!! Cuiv you are a naughty bad guy. I just ordered it and will sell my L-Extreme. 😂

[@CuivTheLazyGeek]

Hahaha I hope you enjoy! I've been using it the past couple of nights, will soon stack to see the result :-)

[@PopeAstro]

@@CuivTheLazyGeek i can't wait to see it. I follow you closely. I'm using NINA, the Starizona Nexus, Pixinsight and now the Antlia highspeed dual band with my GSO 6 " imaging Newtonian. I'm thinking of making the cardboard cutout for the back of the Newtonian like you did with yours. I've only been doing astrophotography for about a year-and-a-half now and you've helped me tremendously!

[@deep_space_dave]

Great video! Fix that collimation 😁Because of the steep angle of incidence, this can cause internal reflections and other odd issues of the optics are not aligned. Also I noticed that Antlia and possibly other Chinese designed filters (Optolong?) only have the AR coating on the side facing the camera (the gold color). So there is a possibility you are seeing reflections off of the back of the corrector plate. Clear Skies!

[@grrrsoft]

Interesting, that Cuiv is also seeing some reflections or artifacts. I also noticed a strange (although different) artifact on my f5 Newtonian when doing a 15min exposure on the horsehead. So I went on the facebook page, where Antlia had an older picture on how to test with a pen, which side of the filter had the AR coating. The response I got was somewhat interesting: "In fact, Antlia has optimized the new coating process. The front and back sides have no effect on the transmittance and halo. If there is halo, it will definitely have it on either side. ALP-T dual 5nm #goldenfilter achieves a balance between improving halo and SNR." Given though, this reply is not talking about reflections, but I did not follow up on this, since the weather did not allow me to get another shot at the Horsehead for further testing...

[@deep_space_dave]

@@grrrsoft Yeah I have to some more testing myself. I was too busy chasing a comet 🙂 I live in a Bortle 9 area so my exposures are really short especially using a RASA, like no more than 30 seconds even in narrow band. So I have not tried anything longer than that and have not seen halos nor reflections. I did see odd reflections on other filters but that was before I fixed my tilt issue. F2 can be a pain sometimes, like a fast car, needs a lot of maintenance!

[@barrycampbell532]

Cuiv. Could you please test the Antlia Triband RGB Filter. It's been out now for several months and other than the Chinese review to my knowledge no one has reviewed it.

[@CuivTheLazyGeek]

It doesn't really look like my kind of filter, for Tokyo at least, so I don't think I'll be purchasing it to test...

[@kennetknudsen7042]

makes me need to plan better if i want to get a Rasa 8, going to shoot mono and atm i have some optolong SHO 7nm and LRGB kit in 2"

[@CuivTheLazyGeek]

Exactly, narrowband is more complex in terms of equipment at F2!

[@kennetknudsen7042]

@@CuivTheLazyGeek yeah will make a shopping list to buy, but might want to give my old SHO kit a spin first might be lucky with em being 7nm and buy the ones i need after.

[@celiaxel3448]

Thanks for another great video @Cuiv ! I suppose you wouldn't have the same bandwidth shift issue with the Samyang 135 at f/2 as you don't have an obstruction in the middle? These specialised filters seem really to be designed for the RASAs and Hyperstars or am I wrong?

[@CuivTheLazyGeek]

You're not entirely right nor wrong! The Samyang will still suffer if you use a normal very narrow NB filter: the outer edge of the lens (e.g. the most surface!) Will end up rejecting the target bandpass but accepting light pollution! Better to simply close the aperture!

[@qx3V45p]

Besides collimation maybe the hyperstar experiencing a bit of pinching as well? Could try wrapping a small dew heater around it if thats the case

[@CuivTheLazyGeek]

Thanks! I'll be working on it next clear night :)

[@robertw1871]

Love your channel, I find it very interesting, even though I image from Bortle 3 and have none of these issues, it keeps me informed on what my friends are facing and the incredible technology available these days…

[@CuivTheLazyGeek]

Thanks Robert!

[@Alucard400]

We need a comparison of this filter to the IDAS NBZ UHS filter.

[@CuivTheLazyGeek]

IDAS will have no halos, but worse SNR, that would be the gist of it :D

[@billblanshan3021]

Cuiv, talk to Lukomatico about this filter as he is reviewing it right now. I believe he is having huge halo issues on yellow stars. Thanks for the video and keep up the great work.

[@CuivTheLazyGeek]

Thanks Bill! It will be interesting to see Luke's review!!

[@ckott99]

15:46 No need to apologize for the collimation, your corners look just like my corners🙂

[@CuivTheLazyGeek]

Hahaha thanks!

[@CDigata]

Are you saying you think this filter is better the NBZ UHS?

[@CuivTheLazyGeek]

For me, yes. Much narrower band passes are really useful for Tokyo light pollution

[@astrocatinfo]

As always, really interesting video. I’m interested in that spectrometer. It would be great to have a commercial solution for astrophotographers. Just to be able to test our units 🙏🏽

[@CuivTheLazyGeek]

It's available from Goyalab (Goyalab Indigo) but it's not super cheap either

[@andrewweller5119]

how does this filter compare to the L-Ultimate which is cheaper and is 3nm?

[@CuivTheLazyGeek]

The L-Ultimate won't work well at all on a F2 scope! Otherwise, an L-Ultimate that performs up to spec (not a given) should beat a standard ALP-T very handily at F4 or slower

[@nikanj]

Looks like a winner. The ball is now in Optolong's court to come out with a highspeed L-Ultimate. However 3nm is so narrow that they'd have to do an f3 and and f2 version like Baader.

[@CuivTheLazyGeek]

Yep, and I like to think my videos had a hand in making Baader provide those F2 and F3 specific filters :) An alternative would be another 5nm bandpass filter with higher transmission and no halos!

[@nikanj]

@@CuivTheLazyGeek I really do think you had some influence on getting Baader to come out of the f3 filters. And I'm very thankful because I own them and they blow my old 7nm filters out of the water. Previously people shooting with f3 systems had 3 choices. Shoot with 7nm filters which kind of defeats the purpose of owning a fast scope since you are sacrificing the better SNR of more narrowband filters. Use 3nm filter anyways and potentially have even worse SNR than with 7nm. Or order custom shifted 3nm filters for Chroma (I didn't even bother asking how much they cost). I hope more companies follow suit. Currently there's no good off-the-shelf option for OSC shooters who want an ultra narrowband filter. But maybe this use case is too niche for companies to invest the effort.

[@andrewweller5119]

donuts are from dust no? so your flat frame arn't being processed correctly or the image chain changed post imaging and it is removing the dust from the image even though it wasn't there at the time of imaging?

[@CuivTheLazyGeek]

I don't think it's dust, I've taken images with the ALP-T right before and right after taking images of the Horsehead, and those images showed no donuts at all, even after stacking... I've also double checked the flat frames, no sign of donuts there...

[@andrewweller5119]

@@CuivTheLazyGeek that would bend my brain as I would have to find it haha

[@anata5127]

Is f3.3 fast enough to shift spectrum?

[@CuivTheLazyGeek]

F3.3 will have some steep angles, but you're mostly in the clear, especially at bandpasses of 5nm FWHM or more

[@anata5127]

@@CuivTheLazyGeek Ok. Thanks

[@anata5127]

@@CuivTheLazyGeek Nice! I have 5nm Astrodon filters. I just don’t want to change them and start picking unpredictable, like “black cats in bag” filters, from some companies. Debates about quality of products from Antilas, Askars, Optolongs, ioptrons, etc will go forever. Their quality is just unpredictable. How they told in a movie “don’t understand it, rid of it”.

[@AdmiralSym]

I

[@CuivTheLazyGeek]

You're gonna make me blush :p