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06-07-2023, 09:50 AM
I finally got around to buying one of these, and I think I've made a very accurate model of the lens.
I made a series of paper templates, with different radii cut out, and the 65mm radius seems to be a perfect match:
![[Image: oo0MgO3z_o.jpg]](https://images2.imgbox.com/62/f2/oo0MgO3z_o.jpg)
The back of the lens is completely flat:
![[Image: osDIjYKX_o.jpg]](https://images2.imgbox.com/e4/6a/osDIjYKX_o.jpg)
I haven't been able to remove the lens, so I placed a spacer on the back of the lens, measured the total thickness of the lens and spacer, then subtracted the thickness of the spacer to get a lens thickness of 13mm. I assumed the perimeter of the lens has the same dimensions as the perimeter of the retaining ring. Here is the model I ended up with (Link to STL).
![[Image: 4f3L0ouX_o.png]](https://images2.imgbox.com/a5/df/4f3L0ouX_o.png)
I made a series of paper templates, with different radii cut out, and the 65mm radius seems to be a perfect match:
The back of the lens is completely flat:
I haven't been able to remove the lens, so I placed a spacer on the back of the lens, measured the total thickness of the lens and spacer, then subtracted the thickness of the spacer to get a lens thickness of 13mm. I assumed the perimeter of the lens has the same dimensions as the perimeter of the retaining ring. Here is the model I ended up with (Link to STL).