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In order to use the ZWO EAF with the Samyang 135mm you need a focusser ring to adapt to GT2 belts. I designed the rings and the EAF holder myself, but the Adapter for GT2 belts can be found here: https://www.thingiverse.com/thing:4761672/files It is a tight fit but can easily be made a little wider with some sanding paper Have fun, Michael |
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 Here's the design for the Adapter rings: https://a360.co/42DEtjU and the STLs for the bigger (80mm) and the smaller (70mm) ring 80mm top.stl80mm bottom.stl70mm top.stl70mm bottom.stl and the dovetail: https://a360.co/43zqGMv Dovetail v1.stl Print the Dovetail standing on it's small side, this will make the print more stable for claming things into the dovetail. The knobs for tightening the rings were taken from this model: https://www.printables.com/model/466697-samyangrokinon-135mm-rings-fine-bahtinov-mask/files |
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Hi Michael! Nice setup! I noticed in the photo that you are using the ZWO adapter. I recently purchased the Astro Essentials M48 adapter and was wondering when you started using it. Have you noticed any improvements in star quality in the corners of your images? CS |
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I have two Samyangs, one with Nikon Mount and the other one with a Canon Mount. What I saw is that with the M48 Adapter (which is only available for the Canon Version) the overall stability was much improved so that there is an actual chance to better correct out tilt. The Nikon adapter is quite flimsy, you can easily move the camera position with a finger and even gravity can cause issues when you use longer cables or have stiff cables that slightly move the camera. The Canon may be a bit better because it has bigger diameter so the effect of the mass hanging behind the adapter is perhaps not that big. But I did not even care to buy one, I first bought the M48 Adapter and after that looked for a reasonably priced 2nd Hand Samyang with Canon mount. I also found out that mounting plays an important role for tilt, I had versions of my rig where I supported both lens and camera, but this was actually not helping much because it was difficult to get good alignment, so I ended up with only supporting the lens, please see attached picture.... For your setup with the filter wheel I'd imagine that the M48 adapter should be a game changer because you have even more weight hanging at the end of the lens. I am currently developing a tilt adapter, first started with a 3d printed version, now I have everything to cut Acrylic, so I cannot say for sure that I will end up with close to no tilt with the adapter but I can say for sure that there will be less variability with the M48 Adapter compared to the Nikon Mount Michael  |
