Dear learned lens gurus,
I have a Turner Reich Triple Convertible lens (that I absolutely love) in the following configuration: 12" f/6.8, 25" (?), and 28" (?). I forget the max apertures of the converted configurations, and I'm too lazy to calculate them. My question relates to the many other configurations I've seen, such as 12/21/28, 12/19/28, 12/19/25,12/19.7/26, etc. How many configurations are there?
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