I wonder if any forum member can help with the following queries on Goerz Artar/Red Dot Artar
lenses. Does information exist which shows lens numbers related to year of manufacture?
Last year, another forum member very kindly sent me an Artar coverage table. This was extremely interesting, and closer inspection showed there to be an apparent significant difference in coverage, between ordinary Apo Artars and their Red Dot counterparts, biased towards the older lens, in focal lengths 30" and larger. This appears to be on a sliding scale , with much reduced angles of view/image circle for the Red Dot lenses as the focal length increases. I thought that the the major differences between the Apo and Red Dot lenses was in the coating. Can anyone throw any light on this? I would be most grateful for any help or advice.