New objective and question about my 20x Apo

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Rossf
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Joined: Mon Jan 20, 2020 12:39 am
Location: Victoria Australia

New objective and question about my 20x Apo

#1 Post by Rossf » Fri Sep 18, 2020 12:44 pm

Firstly has anyone else got this Leica objective? EF L 20x N/A .30 corrected for 0-2mm but no correction collar? Just arrived today and It’s a beauty-it’s seems about plan achromat sharp despite low N/A but stays as sharp wether thin coverslip, thick Petri dish on inverted scope or even deep chamber slide with no cover slip! It’s a keeper for sure but it’s only a little lens at the tip and hollow the entire barrel and has quite a lot more depth of field than normal 20x (low N/A no doubt)-some of these leica lenses can seem to have secret mojo I don’t understand . A definite recommend-oh and quite long working distance.
Second I noticed my Olympus short barrel 20x Apo is a bit different from catalogue-it has the letter F after the 20 lettering-it doesn’t look fluorite image wise-I wonder if Olympus made a later edition to fill the missing gap in their BH-1 era DIC system-any other ideas?
Regards folks ross
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