Alignment jig for cementing doublets (lenses) (FreeCAD/parametric)
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A 3D-printable, parametric jig designed to align the lenses of a glued doublet for re-cementing.
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- Creative Commons — Public Domain
I recently purchased a used film camera, a Yashica FX-3 Super 2000. The camera arrived in excellent condition, and the lens also appeared to be in good shape at first glance. However, upon looking through the viewfinder, I noticed that something was not quite right - the image was uniformly hazy.
Naturally, I first tried cleaning the outer lenses, but this had no effect. Next, I disassembled the lens and cleaned the accessible inner surfaces of the lenses, only to achieve the same disappointing result. Finally, I completely disassembled the optics to discover that the issue lay within a cemented doublet.
Since a lens as hazy as this is just as useless as a broken one, I decided to separate, clean, and re-cement the doublet. I followed this very helpful video for guidance:
As the two lenses need to be cemented together as precisely as possible, I designed this jig. It uses a VarSet, which allows you to easily adjust the values to your needs and then export the custom parts.
PS: Two M3 bolts are required.
PPS: FreeCAD source file (obviously) included. 🙃