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Anyone care to rate the 100mm C lens?

100 mm C lens

The 100 mm C lens is the oldest design by CZ for V series cameras that is still being produced.
Glass from a new 100 mm CFi lens will fit the earliest 100 mm C lens.
Optical design and lens mounts are identical.

That brings me to the difference between a C lens with T* and the current CFi version.
There is no difference besides a small improvement in anti reflection coating of the lens barrel and a difference in shutter.
The later Prontor shutter is less demanding as far as service is concerned.

To sum it up:
You will have a hard time finding which of two exposures made by C and CFi lens was made by which lens.
Statistically you stand a 50% chance to guess right of course.