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I would generally steer away from fast camera lenses as a general rule with a few exceptions.
Digital cameras these days are relying more and more on lens profiling and corrections done in camera with the firmware.
Lens designers are actually taking that into account when designing new lenses in many instances.
Fast lenses usually mean poor chromatic aberrations and coma wide open.
So you waste the first couple of F stops as they are designed for low light terrestrial or for increased background blur not sharpness, not low vignetting nor chromatic aberration.
The designer has several factors they have to play with and some of these are conflicting so its usually a compromise.
The only decent fast lenses I have used are:
Samyang 24 1.4 (really F2 onwards and really F2.8)
Nikon 85mm F1.8G (same, F2.8 onwards)
Fuji XF 35 1.4.
So you're better off getting F2.8 lenses and then try them wide open and be prepared to go to F4 or F5.6 to get them performing reasonably.
I agree about the Pentax 67's. Long back focus and able to use the centre sweet spot of the optics.
Greg.
Greg.
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