There are three versions of the 400/5.6: K, M, and A. The A is quite good, and of course it offers auto exposure on digitial cams. It offers a much shorter minimum focus difference than the K lens. The M falls somewhere in between. The A will focus tight enough to get good full-frame bird pics. All are quite sharp and contrasty. You'll get some CA when shooting branches against a white sky or other high contrast subjects. It's fixable in PS.
I'm not familiar with the bigma, so I can't say that it's better. Paul On Mar 19, 2010, at 5:30 PM, Larry Colen wrote: > It seems that I've got a weak spot for fast primes. > > I've been talking to sonpix about his Pentax 400/5.6 and I'm curious how it > would compare to my bigma? > > It's a little faster at that length, and a little shorter, but how does it > compare in size, sharpness, aberration and bokeh? > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
