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09-12-2017, 07:43 AM   #1
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Just Noticed that the Zenitar-K2 might be an Apochromat

The IR index seems to be right on the visible light index, my guess is that it is CA corrected for not only both visible light but also near IR. Any ideas?

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09-12-2017, 08:42 AM   #2
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Isn't part of being an apochromatic lens that it corrects spherical distortion?


(Taken with a Zenitar K2)
09-12-2017, 08:44 AM   #3
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Ummmm...I believe the "R" is in place of the "4". The Helios 44M-6 has a similar marking...




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09-12-2017, 08:50 AM   #4
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QuoteOriginally posted by stevebrot Quote
Ummmm...I believe the "R" is in place of the "4". The Helios 44M-6 has a similar marking...




Steve



my Helios 44K-4 has the same markings...

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