Regarding Cap Frank's questions, several symmetrical designs are quite tolerant of differences in subject/image ratio. One example is the dialyte, four individual elements with the positive elements front and rear. Examples are the highly regarded 203mm f7.7 Ektar, and several process lenses such as the Apo Artar, Repro-Claron and others. More compact vertical process cameras brought a requirement for lenses of similar characteristics, but greater coverage for a given focal length. The G-Claron was a very successful response to these needs. There are actually two versions of the G-Claron. To gain the increased coverage, it was necessary to go to six elements. Originally, these were all cemented, but later production items have an airspace which gives the designer a little more opportunity for correction. While it is true that its ideal use is at close to 1:1, when stopped down to f22 it gives an image at infinity which is quite acceptable. Many photographers are very pleased to have the small size and weight of the G-Claron and find the small aperture no sacrifice.
I don't know anything to do about the paint problem.
The Apo Lanthar prices are, I think, just one more example of supply and demand. They weren't made for very long, so there are less of them available than there are people who would like to use one. I used a 300mm Apo Lanthar on 4X5 for many years, mostly for product photography, and found it a delight to use. A bright image and lots of coverage are a pleasant combination. Now that shutters for large aperture long focal length lenses are no longer available, I suppose it will remain as the best f4.5 300mm lens available. The smaller sizes have more modern competition, but there are still potential buyers attracted by the lenses' large aperture and fine reputation.
Bookmarks