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JA,
Those lenses are modified - I removed focus stop, so they can be focused on sensor even couple mm apart from thread (yes, Rubinar has M42x1 and Samyang has M42x0.75 thread).
Field curvature will be another issue of course.. but for guider not detrimental I hope.
I also plan do make adapter to ø31.8 mm for camera to fit into 1.25" eyepiece... just to enable another possibility.
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