For my progressions, I've always picked a percentage, and then made each successive focal length that percent more than the last focal length. So, increasing the focal length by 33% each time would give me a progression of about . . .
90, 120, 160, 213, 284, 379.
So, this progression might match up with the following lenses . . .
90mm, 120mm, 150mm, 210mm, 300mm, and 360mm. Or, there 'bouts.
But in terms of field of view, I'm not sure this makes sense. So, I need to think about this some more???
Will be back a little later.
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