Originally posted by Ron Boggs Most of the talk on these forums pertains to how well the FA lineup works with today's digi sensors--note several threads holding FA Limited and FA* lenses in high acclaim.
To me, it appears that the "digital optimized" lens engineering worries are largely worries rather than problems. Haven't seen too many "look how bad my FA translates to digital" test photos or examples. The odds seem remote that a larger sensor will somehow finally tip the "angle of light hitting sensor" issue into the realm of "damaged goods" labeling for FA lenses.
Personally, one of the reasons I've enjoyed holding onto my FA lenses is because I know they'll work with full frame sensors whenever that eventuality comes to be. At least they'll work in the sense that the image circle will cover the sensor. I'm not worried that the corners of the sensor will fail to absorb light due to obtuse angles. Hasn't been a problem for various other brands...won't be for Pentax. Current market values for FA lenses--especially FA* and Limited lenses would suggest that the general mood in the marketplace is positive for FA lenses as sensors evolve.
it all comes down to the sensor design, as I noted above, and the need to have light hitting the sensor closer to 90 degrees than on film. This may or may not be a problem.
there is the secondary issue of rear element coatings, to avoid the internal flair from the reflection off the UV and IR filter in front of the sensor, which has a higher reflectivity than film. This will result in reduced contrast.
yes these are "worries" but until you see performance on a full frame sensor you just won't know.
But for me, I don't see the need to go full frame, at the rate of sensor improvement ASP-C does just fine.
I do not, however, understand why pentax has not re-engineered some of the F and FA line up to expand their lens options.