Can anyone tell me how this lens is mounted to the board? I see what looks like a retaining ring behind the aperture assembly. Does the entire lens simply unscrew from this ring? I was able to remove the front glass from the aperture but everything else is securely stuck in place. Except that the rear glass needs to be cleaned, it's in great shape so I'd really like to remove it and clean it up. Also, what's the optical construction - looks like 4 elements in 4 groups.
Thanks,
dan
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