I have searched the forum but could not find the answer to my query.
Basically, I have purchased a good copy of a Goerz Apochromatic Artar 10 3/4 inch in barrel mount with flange. It is the post-war, coated, non-Red Dot version from circa 1948-1954 according to serial number. A Goerz catalogue from 1951 states that it takes a Compur 1MX or Ilex Acme 3 shutter. I can find decent copies of both shutters for sale online and I am willing to take a risk to pick one up to see if the lens will mount.
The lens barrel unscrews into three parts: a small rear part, containing two glass elements; a small front part, containing two more glass elements; and a larger middle part, containing the iris.
However, what I do not understand is what happens to the middle part of the lens (the iris) when mounting on a shutter given the shutters come with their own iris? Am I supposed to discard the iris from the lens and just mount the front and rear glass elements to ether side of the shutter? Or, can I screw the front and middle part of the lens into the front of the shutter and screw the rear into the rear? The latter would mean that the assembly would then have two irises, but am I wrong is assuming that is OK so long as I control the lens iris for exposure while always keeping the shutter iris wide open? Is this what is meant by “front mounting”, a term I have seen referred to in this forum?
Lastly, other than the difference in how the shutter is cocked, is there any difference in front and rear mount screw thread size between an Ilex Acme 3 and an Ilex Universal 3?
This is my first time trying to mount a barrel lens to a shutter so any informed advice would be much appreciated.
Regards.
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