The A400 5.6 suffers pretty bad CA even right down the middle, at least mine does. There was a long thread about this a couple of years ago when I posted a shot where the fringing was pretty bad in the middle of the image and the scene wasn't even backlit. The CA correction in Camera Raw and other converters can't fix it.
That was coupled with the K10D. I've not used it much with the K20D. ----- Original Message ---- From: paul stenquist <[email protected]> To: Pentax-Discuss Mail List <[email protected]> Sent: Wednesday, May 27, 2009 5:53:44 PM Subject: Re: Big-telephoto advice The A 400/5.6 is a much better lens than the screwmount, the SMC or the M versions of the 400, in that it will focus close enough to get a bird full frame, and it gives you all metering options on a Pentax digital DSLR. I've seen them for less than $400. I think that's about what I paid for mine four or five years ago. A decent lens. It also works well with the Pentax AX-S 2 and 1.4 converters. It doesn't accept the L converters. Some CA on digital cameras when shooting branches against the sky, but that's fixable. I would guess the SMC 500/4.5 or 300/4 are even worse in that regard. Paul On May 27, 2009, at 8:28 PM, Tim Bray wrote: > On Wed, May 27, 2009 at 5:25 PM, Bob Sullivan <[email protected]> wrote: >> Tim, >> A screwmount SMC Pentax 300mm f4 or 400mm f5.6 would be great. >> Most everyone else passes on these as too old, their problem! > > Those 300 screwmounts (under the Takumar name, right?) are all over > the place in the non-SMC version, harder to find with the SMC. How > big a deal is the coating? -Tim > > -- > 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. -- 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.
