I am assuming this has to be separation given that it is located within the rear group of a lens of Tessar design. It does however look to my untutored eye rather dendritic. More so than the picture shows. I have thankfully been free from either apart from a little crystalline separation on some Gundlach Turner Reichs I have so do not know what to make of this. I would appreciate your opinions.
Also I wonder if anyone recognises the focusing mount this lens,the same lens, is mounted in.
The Dallmeyer catalogue says it will cover quarter plate which is probably rather conservative give it is 6" lens which they also say will cover an angular field of 50 degrees. Every one of these lenses I have seen pictures of is mounted in a focusing mount for motion picture use and this one appears to be too, but different from any of the others I have seen. The lens board is part of the mount. Just curious that's all. Thanks in advance.
Roger
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