Diaphragm for Lighted Magnifier to Reduce Distortion
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Diaphragm to improve a cheap lighted magnifier.
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- Creative Commons — Public Domain
Some time ago I purchased a small lighted magnifier; the optics were not perfect, but surprisingly good. So recently I decided to purchase some additional units. Unfortunately, while the new ones looked similar, the optics were very poor with a great deal of edge distortion.
The picture below shows the new units on the left (blue dots for future identification), and the original unit on the right. Note the diaphragm installed on the leftmost unit.
In an effort to improve the new units somewhat, I printed this diaphragm to install in front of the lens assembly. The diaphragm reduces the distortion somewhat, at the cost of reducing the field of vision. But at least the new units are now usable.
Assembly
The picture below shows the lens assembly taken apart, but this is not necessary to install the diaphragm. Simply unscrew the knurled ring (rightmost in photo below), drop in the diaphragm, and screw the ring back on.
Print Instructions
Print in Black PLA using the 3mf file provided; otherwise :
- 0.2mm layer height
- perimeters = 2
- monotonic top bottom fill
- 0% infill
- iron top surfaces
CAD
The OnShape 3D CAD files for this are here :