I just acquired a new Fujinon 450c. I noticed the aperture ring index (and aperture opening) closes down well past the marked upper f64 limit. In fact the thumb lever actually ducks under the shutter release before limiting out. The lower end (f12.5) pretty much ends up (close enough) on the printed number as expected. Comparing it to my Fujinon 180A, I notice the aperture ring index on the 180A begins approximately half a stop before and after the min and max apertures, respectively. I'm guessing this is correct and probably should know why, but f64 on the 180A is not the same diameter as f64 on the 450c. Is this normal (for this lens)? If I wanted to use them, do I just guess at higher apertures since they are certainly available? Not be concerned about the relative range of the index compared to the markings, nor use above 64? Do I even trust the marked apertures to be any where near accurate?
f64:
f64++?:
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