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| Got it, will test as soon as I get it. |
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| I designed rings and dovetail for this lens see https://www.thingiverse.com/thing:5205883 for 3d files. |
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| I use the Astrodynium ring set and the ZWO camera lens adapter and it works straight out of the box. Its an awesome set up and so forgiving to use combined with a Bahtanov mask. The William optics clean masks are really good (not cheap) |
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John O'Mahony: How does your imaging train "look"? If you use the ZWO lens adapter - I assume you have the Nikon version of the Samyang? |
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For me, the William Optics "Cat Ring" and "Cat Series Saddle Handle Bar" worked the best for my set up. You don't have access to aperture but that's okay for me. The ring spacer and EAF mount are 3D printed. Note that I have the First Light Optics M48 adapter and am using a ZWO filter wheel and ASI-1600MM in these photos when looking at the spacing below. https://williamoptics.com/products/accessories/cat-mounting-ring-cat-series-saddle-handle-bar https://www.firstlightoptics.com/adapters/astro-essentials-samyang-lens-to-m48-adapter.html    |
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Christian Bennich: Hi. I use ZWO adaptors on my 135mm Samyang. they have everything you need to attach and also use filter draw etc. good instructions on the gear also. i don't auto focus because i found very very little if any need to autofocus during sessions. the lens is stiff enough to stay and is reasonably temp resistant. |
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| Do you all have your own 3D printer - or do you use some service to have the spareparts printed? |
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Norman Tajudin: Your imagetrain is the same as the one I am trying to build. But you have 50mm backfocus in your setup, should it not be 44 for the Canon version or 46.5 for the Nikon version of the Samyang or is your version a different one? The spacer ring - where could I find the print file for something like that? |
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Christian Bennich: Mate I am super happy with my Astrodymium 3D printed rings and support for accessories like the focuser , guiding scope and the controller … arrived in Australia very fast and consistent built quality . ( I have 2 of them to shoot on a double system ) |
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Looks like everyone has dumped all the relevant equipment in this thread so no need to add on to that. As for tilt/backfocus adjustment here are some things to consider:
Not all lenses are created equal. If you find the stars too soft at F/2, I recommend most of your data at F/2 and then doing stars at F/4. That is what I did for this:  Veil of the Veil |
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Looks like everyone has dumped all the relevant equipment in this thread so no need to add on to that. That's exactly my goto method as well, albeit with the more forgiving 533 sensor. I think the trunk section of my test image is pretty good and I agree, I want to collect data at F/2 for narrowband at least. As long as the stars are looking good stepping down and can be removed without creating nasty artifacts that's ok by me. |
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This little bad boy of a lens sounds like a fun challenge 🤪 I look forward to receive my gear and start playing with it. My first task is 44mm backfocus. Does it make sense to go for 43mm or 42mm and then use shims to get to the right result? Leaving a few millieters could give room for fine adjustments in either direction. |
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| @SemiPro is dead on. Stepping the lens down is just reducing light gathering ability which is the main reason to use this lens. Nothing else gives you so much aperture in such a small, affordable package. I’ve found with APS-C that stars need to be as close to perfect as possible to be fully removed. If not, bright stars will be left behind and removing them with clone stamp is tough. |
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| @SemiPro - I for one, don’t know about the charts you mention to adjust curvature. If you have a link of sorts - that would be awesome. I have been looking into the measurements that ASTAP can do - but have not come across charts like you mention. |
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Christian Bennich: I think I posted a link to OPT where you can find the charts illustrating backfocus but I'll re-post it here: https://optcorp.com/blogs/deep-sky-imaging/how-to-set-the-correct-back-focus If you scroll down a bit you can see how the star shapes indicate too far/close the sensor is. |
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Christian Bennich: Hahah, thx @Jan Erik V - I have been working my way through that article in between my sunbed and the pool on my vacation here. I guess I just need to keep reading 👍🤪 |
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Christian Bennich:Christian Bennich: Lucky you, enjoy your vacation! |
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All you guys with the nice Samyang lens, have you considered contributing to the Astrobin community Survey? We are still looking for people that want to put their Samyang to good use: https://www.astrobin.com/groups/5818/astrobin-community-survey/ Michael |
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Michael Ring: So absolutely - I volunteered initially. But only had a 1000mm focal length newt. Now I can help out as soon as I have the rig etc. up’n running 🤓🤓 |
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Michael Ring: I actually have. But for the last year, weather here has been atrocious (6 images or so finished), my Samyang is not in my permanent setup and I‘m in Bortle 6, rising. I‘m quite certain there isn‘t anything for me to contribute. Anyone in Bortle 3 and below will just fly by my SNR contribution within minutes even if I dedicate all my clear sky time. |
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| @Torben van Hees : Yes, you are right, Bortle 6 can be a little painful when it comes to integration time. I am in Bortle 4 and it hurts to see that I need roughly double the integration time than lucky guys like Brian who has Bortle 2 Skies. Nevertheless, I have learned so much in the last months from our Mosaic guru and from the other guys on the project that I still think it was (and still is) worth the effort anyway. @Christian Bennich : Glad to have you on board, currently the guys from south are contributing the biggest part, but I hope we can catch up now that the nights get longer.... (Actually I am just setting up, this night is supposed to be clear...) Michael |
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Michael Ring: Been in Italy the last weeks - very clear skies - no astro gear. But I have learned a ton of constellations I didn’t know and tried to do milkyway shots with my phone. Not super successful but fun. Heading back to Denmark tomorrow. Back home, I am in bortle 4/5 skies - close to the sea though so my eastern sky is much darker than my western skies. |
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| @Michael Ring - where are you based? I am 35 km south of Copenhagen, Denmark on the coast. And in general - where are you all in the world? |
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I am in Switzerland, just far away enough from the city of Bern so that my home has bortle 4 skies. But the mountains are close so I try to be on 1600m as often as I can where the Bortle 4 is scratching on the Bortle 3 mark. Michael |
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Michael Ring: NICE - I love Switzerland, spent a week hiking in Zermatt in early July. Beautiful 🤩🤩 |
