Goerz red dot lens board removal

**Bernice Loui** · 27-Jun-2022, 11:45

Possible this "Kern" lens is related to this previous discussion:
https://www.largeformatphotography.i...n-made-by-Kern

Bernice

Originally Posted by Joseph Kashi

I use a 305 Repro-Claron on 5x7 BW and it's certainly very sharp with adequate contrast. I also compared my 14" RDA with a 14"/360 Kern barrel lens that I had mounted in a Copal 3 by S.K. Grimes and my sense is that I prefer 14" RDA overall, including resolution. I have not been able to find anything specific about this lens from the literature. It appears to be a Dialyte-style process lens but I really don't know.

Does anyone have any non-speculative information about this or similar Kern process lens? I picked it up about 40 years ago and it was "shelf-ware" until I had it mounted in the Copal 3 a few years ago.

**Joseph Kashi** · 27-Jun-2022, 18:42

Below are images of the 360mm /f11 Kern "Apo Repro" lens front ring. I have not been able to find any other information about it. It's not a Trigor so far as I can tell.

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**drew.saunders** · 27-Jun-2022, 19:25

Originally Posted by ChuckFowler

Bernice thank you so much for the wonderful information and details, and answering my next question about mounting on a Linhof board !

Lens is off the board now

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I’d recommend putting the lens back onto the flange, then marking the lensboard where the middle of the Ilex diamond is. Remove the lens and mark the flange at the same spot as the mark you made. This will allow you to decide how the lens will be mounted on your new lensboard and get the 3 screw holes tapped accordingly.

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