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Latest Review Posted SMC Pentax-M 50mm F1.4
Firstly, on film, having conducted some systematic methodical testing, this is sharper than my 50/1.7, which is sharp already. Notably, the 50/1.4 is as sharp as the M 28/3.5. I comment using the Pentax-M 28/3.5 for reference, as its notable as being an excellent performer. It has shown itself capable of exceeding 80lp/mm on TMAX film previously, which is impressive given this is approaching the limits of film in normal contrast settings.

In recent testing, I got 77lpmm out of the M 50/1.4 at f5.6. The M 50/1.7 only managed 66lp/mm at f8, being less sharp at f5.6. I need to rerun the testing for all apertures for these two lenses. Its my feeling that the 50/1.4 is actually diffraction limited at f5.6, and that f4 may be sharper, whereas the 50/1.7 needs stopping down to f8 for controlling aberations. This might all seem boring, but once you have tested a lens, you can take pictures with it until your heart is content. Its quite tempting to pick up a Planar 50/1.4 on a Contax 139 and would be nice to know if the 50/1.4 is as good or better than the Contax.

These readings come from tripod mounted set up, careful development of a roll of film and then analysis of the film under a scope. Limits of resolution of the film are around 100lp/mm in normal lighting. Anecdotal results which do not follow a scientific method are tant amount to the veracity of horoscope forecasting from the back of a local newspaper. Importantly, my results fly directly in the face of an...

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