I recently purchased two Goerz Red Dot Artar lenses--8.25" and 10.75" in barrel, both manufactured approximately 1968 - 1973. The coating on the 10.75" (the sl ightly higher serial # of the two) is all one color, purple, while the coating o n the 8.25" reflects two colors: primarily a "robin's egg" light blue, as well a s a secondary, less obvious light purple tone. I had thought that all Goerz RD Artar lenses, at least from the early 1960's or so onward were coated PURPLE on ly--is this not true? Does anyone own a Goerz RD Artar with a light blue coatin g like mine, or is anyone aware of such a coating being applied to this lens? O r did the coatings differ by focal length? And did Goerz change its coatings on this lens between say 1967 and 1973? Need I be concerned?
Nick Rowan
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