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We build custom imaging systems.
Yes, some applications require cheap solutions...

 

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The high tech photomicroscopy routine is performed by pressing a digital camera lens against the eyepiece of a student grade microscope.  We set the camera focus to infinity.
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The microscope was being tossed in the trash; what could be cheaper?  The camera was $200 a year ago; now (December 2003) a similar 2 megapixel camera can be purchased for under $150.
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The only trick was that the 10X eyepiece had a black plastic lip around the edge which kept the camera lens too far away from the eyepiece glass.  We tried a magnifying glass interposed, a method which worked great for a dissection microscope, but this didn't work.  Fortunately, we had a 12X eyepiece with a flat top which worked fine.

 

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Photomicroscopy by Michael Cammer.
Photos of Michael by Dustin Grzesik.