Here you can discuss different microscopic techniques and illumination methods, such as Brightfield, Darkfield, Phase Contrast, DIC, Oblique illumination, etc.
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My microscope is a no name without a field diaphragm or collector lens so Kohler is impossible? Would anyone inquire other methods of reducing uneven illumination when taking pictures? I was thinking of using a ground glass diffuser but I'm not sure about other approaches.
If your microscope has any sort of substage illumination source (besides a mirror!) built in, don't despair. You can fake up a field iris easily enough by cutting a small hole (1/8"-1/4") in a piece of black paper or cardstock, and laying that on top of the light well (the port the light comes out of). This simulates closing down a field iris. Then with the specimen in focus, raise your condenser until the hole edges are also in sharp focus. Your condenser is now set. Then remove the card & you're ready to observe.