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Metallurgical 2x objective 45mm parfocal design

Posted: Fri May 06, 2022 1:10 am
by urbanpiper3
I am looking for design references on a 45mm parfocal 2x metallurgical objective (WD > 6 at least) for a starting design. It seems difficult to get a design reference for low power microscope objectives. While there are so many copies and clones out there, I can't seem to find any resource for lens designs of these commonly copied clones. A starting design point would be good.

Any advise is appreciated!