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Message: <blockquote data-quote="Vollmeise" data-source="post: 3664452" data-attributes="member: 143821">Moin!Sounds clever to meet these special needs! The angle of the mount seems to be fixed?I'm going to check my CAD-drawings and let u know..The thickness of the inner collar is 1.5mm, the outer height is 3mm (oops.. maybe it's just 2.5mm, have to check that) around. The front part of the collar is 10mm. This makes the whole collar quite sturdy.The outer collar's height should not exceed too much height, as you need enough space to place your fingers to tighten the threadened cover ring. This ring is tapered, so its not easy to apply much force. I'm thinking about turning a new ring with a more finger friendly shape to tighten it with some more force if necessary.The angle between the optical axis of the lens and the eyepiece is 45°.I also was not sure about that (measured 46°), but the real life test and measuring between the attached mounting plate and the collar showed exactly 45° then.Cheers <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>