Folks,
I have a 10.4 inch Cooke Series II f:4.5 (left in the jpeg), which doesn't seem to diffuse very much, and when the diffusion ring is rotated, I can't see the glass move or the inner elements move. I also don't see much if anything on the GG. When I remove the front glasses and hold the front cell in alignment with the rar, I can see a lot of diffusion as I move the front cell in and out.
In comparison, I have a Cooke 10.5 inch Series IIE "knuckler" (right in the jpeg), and when the knuckles are moved, the front glasses move about the depth of the built-in hood and the diffusion is apparent.
So is the Series II "busted" or maybe it just moves the amount of the threads (not much)? Do the two lenses work that much differently?
Thanks much, Steve
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