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I have a big problem to achieve correct focus. Somebody solve with this setup? samyang 135 ( for nikon ) + adapter ( zwo ) + filter wheel or drawer ( zwo , usually 20 mm ) + zwo camera asi6200 |
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F mount lenses require 46.5mm of backfocus. The ASI6200 needs 17.5mm by itself which leaves 29mm to play with. The following adapter/filter drawer from ZWO would do the trick: https://www.365astronomy.com/zwo-2-filter-drawer-for-nikon-lenses-with-male-m42-connection-for-the-camera?path=160_303 You'd still have 0.5/0.7 mm of extra backfocus to play with, depending on the filter you'd be using. You'd be needing a M54 to M42 female-male adaptor to go with it. There will be still some vignetting I'm afraid. Custom modification of a standarf filter drawer with a M54 back thread is another possibility but isn't in the ZWO catalog. Otherwise you'd need a ASI filter wheel for 2" filters and the following adapter: https://astronomy-imaging-camera.com/product/nikon-lens-adapter-for-2filter-wheel |
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Many have problems like this. I wonder whether this might be your answer, you need to remove the bayonet and screw this to the back of your lens. https://www.firstlightoptics.com/adapters/astro-essentials-samyang-lens-to-m48-adapter.html Carole |
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| Hi, thanks. It’s a good possibility. |
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I should add that you will not find that adapter anywhere else as it was designed by a member of Stargazers Lounge having the same problem as you and made by First Light Optics the sponsors of Stargazers Lounge. Carole |
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I had a similar problem but Sony e-mount and an ASI 294mm pro and I built my own adaptor: https://www.cloudynights.com/topic/810468-diy-asi-to-sony-e-mount-adapter-with-filter/ Clear skies, Achim |
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Carastro: That won't work. It is for a Canon fit not a Nikon. You'd need to add a 2.5mm spacer to make it work. |
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I believe the bayonet gets removed altogether, it certainly fits some of the more modern CMOS cameras, but not sure which since I just know it doesn’t fit my Atik cameras. The Retailer knows what cameras it will fit. Carole |
