Gear Talk > Lens Talk

Coastal Optics (Jenoptik) 60mm lens mysterium

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Dr Klaus Schmitt:
Well, there is a some mysterium going on, on their site about the presented data...

Their new presented data show much less transmission... (magenta is new)



But their lens is much better than that...



I wonder what happened when JENOPTIK bought them, and I did ask their president Jay Kumler about that...

longzoom:
I see only one explanation for this innovation: they used a new kind of glass for some optical elements. The new MC cannot deliver so radical changes to the charts you show. LZ

BruceSD:
Maybe some more magical "pixie dust" conjured up the the maestro himself - Dr Thomas Caldwell ?

Birna Rørslett:
The designer of the original 60mm, Brian Caldwell, likely has the explanation?

Dr Klaus Schmitt:

--- Quote from: Birna Rørslett on February 19, 2021, 09:17:43 ---The designer of the original 60mm, Brian Caldwell, likely has the explanation?

--- End quote ---

That old graph was from him, along with the CA diagram showing "Apo" correction -
the new however seems from Jenoptik and the CA diagram only shows Achromatic
correction...??

We chatted ever so often, so I could ask him, but my feeling is that he cannot talk
about it (NDA) most likely...

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