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The microscope uses BH2. Used in combination with a phase difference capacitor. Listed lens type / long neck objective lens / mount sizeRMS 20.25mm. You can judge the accuracy of the objective lens from the photo.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.