Hi,
MTF is essentially the way lenses are characterized. A lens is calculated to have a certain MTF. There are, however, parameters which are not described by MTF.
MTF essentially measures sharpness. A lens with a higher MTF is simply sharper. It is possible to conceive cases where a lens with lower MTF is sharper than a lens with high MTF but I would suggest that this is not very common.
MTF does not measure a lot of things:
1) Distorsion
2) Flare and ghosting, which is notoriously difficult to measure
3) Bokeh, although there are some suggestions that lenses that have a small difference between sagittal and tangential graphs would have good bokeh.
The MTF curves published by Hasselblad are measured at the factory using the same methods and equipment, so they should be comparable.
By the way, I'm not a expert on optics. Just an interested amateur!
As a side note: Bill Atkinson says in one of the the interviews with Michael Reichmann that the HC 120/4 macro is probably the best lens he used. (Or something like that) Michael Reichmann is very satisfied with his HC 50-110 (now that it is no longer falling apart).
Best regards
Erik
But how much does the curves really say about how a lens perform?
Is a lens with a better MTF-curve always a better lens?
Henrik
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