A26 to M42 Lens Adapter
Description
This is a partial solution to adapt a Rollei A26's 40mm f/3.5 Sonnar to your modern digital MILC (SLRs and DSLRs are not compatible). You press-fit the lens assembly into this print to give it an M42 screwmount and almost-standard 49mm filter threads. With a little blue painter's tape filling the gap, it stays in place nicely such that it should be safe to slap on your camera. The lens was not intended to cover a full frame sensor, but it kinda-sorta does albeit with some significant but correctable light falloff! With the square baffle screwed in to the rear of the lens assembly (also harvested from the camera), there is a noticeable vignetting from it, but I do choose to keep it on there because the rear of the lens has lots of reflective bits and bobs. It's minimized if you rotate the assembly just right, and it seems to go away as you focus closer. In the product images, I have this print screwed-in to my M42 to Sony E focusing adapter, "M42-4-E-Var". (https://www.thingiverse.com/thing:4902657). If you're curious about this lens and you want a very small, compact, lightweight, and disposable lens setup, I'd encourage you to check it out. It has a very pleasant rendering at close-up distances and seems very clean when it comes to longitudinal CA, but it does suffer towards the edges/corners. This may perform better on a thinner sensor stack, on a BSI sensor, and/or on a smaller sensor (APS-C, MFT), but it does well enough on my A7 II considering how dinky it is. If you want to be able to focus it, you'll need a helicoid that maintains or falls below M42's register distance of 47.46mm at its shortest for your camera setup. Disclaimer: This model is offered AS-IS with no guarantee that it will print for you as well as it did for me. The tube may interfere with the aperture pin ledge of your M42 adapter (it doesn't/shouldn't interfere with my 3D-printed one though) if it has one. Print and use this adapter at your own risk (risks include, but are not limited to, the following: introducing small dust/PLA particles to your camera's internals, having prints break on you, having the lens slip out towards your sensor[!] if you neglected to give it a safe fit and/or you have an unfortunate accident).
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