Hi all,
I've come into possession of a non-gold dot / rim C. P. Goerz Dagor 12", AM Opt. Sn. 7705** (in Ilex 4 shutter), which indicates it was made somtime between 1945–48.
I have a few questions with regards to this version of the lens, and was wondering if people may be able to help answer them.
Firstly, I'll attach photos of the front and rear elements which have quite a bit of mottling on the lens coating. Viewed straight on it's not really visible, but viewed from the side at a particular angle it's very obvious. Do people think this will affect its performance too much? I'm suspecting not, but thought I'd ask to see what people think. I'll be shooting BW.
Also, with regards to this era of the 12" Dagor, I'm wondering what people have found with regards to focus shift when focusing wide open then stopping down to shoot. I'll be shooting mostly up around f32/45, where I guess focus shift will be less obvious, but I'd like to get info on how to predict its behaviour if I choose to shoot wider in some situations. With lenses that exhibit it a lot, I'm guessing it's best for focus at f8/11? And if I'm focusing at mid-distances, I'm wondering how much it'll rear its ugly head anyway?
Lastly, is it fair to say that the IC is quite large, upto 85º, but that for good corners and even illumination it's best kept below 70º?
Thanks again for the info, it's a good community of people and knowledge here!
Tim
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