Quote:
Originally Posted by adam ant
not on the lens itself, the housing or base of the unit. in the PDF file there is a photo which (unclearly) shows some sort of metallic container or device on the bottom. corrct me if i am wrong.
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There is no metal supporting the lens, or encasing it. I'm not sure what you see, but it may be the support bracket for the incandescent lamp I used for illumination.
The test jig I used for capturing this image consists of a PVC ring painted flat black that supports the lens, and it's mounted on a movable stage (up-down) like an optical microscope uses. Below the lens assembly is another PVC housing painted black that the light source is contained in. The mounting hardware is brass and aluminum (non-ferrous).
I can upload the test jig on my server for you to view, if you desire- and provide a link to it here.
