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Oldish microscope: the iris diaphragm seems to have two adjusters but they seem to do the same thing? Is there any difference between the bottom most knob and the lever arm and
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Na1.25 Abbe Condenser Variable Diaphragm, Xsp-05 Microscope - China Microscope, Case | Made-in-China.com
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Microscope Aperture, 1.5-23mm Adjustable Iris Diaphragm Microscope Iris Adapter Lens Optical Diaphragm for Laboratory Microscope
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Iris Diaphragm Microscope | Camera Microscope Laser Module - Microscope Parts & Accessories - Aliexpress
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