Originally posted by vjacesslav Next try is DA 35mm Macro on Full Frame Film SLR Camera (Pentax Mz-6):
Please be advised that lenses with a classical focusing mechanism, like the 35mm f/2.8 macro, are bound to have very different corner properties (vignetting as well as resolution) at different focus/magnification settings. Generally, the closer you focus, the less lens surface is used, resulting in a loss of center resolution, but generally an increase in corner resolution as well as less vignetting. This is significantly more true with a macro lens since there's so much difference between it's focus limits.
So to be able to provide the complete story on a lens like this, samples must be taken at varying points of focus, as well as aperture settings,
Then again, for usage as a macro lens, the 35mm should be OK, for the above mentioned reasons.