[Objectif] Hello, I’m a newbe and try to build a microscope for my son. I bought these objectives but the image is a disk rather than a square and very difficult to focus. Could someone explain how to read this reference on the photo? I guess: 40X means magnification factor of 40 infinity sign…

Howto read this?

Patrick 17 January 2021 19:47 5

Thanks so much!

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