The longest DA prime is the 300/4, works OK with the 1.4 Tamron TC but hunts quite a lot, tripod mounting helps. This combination was far better than the new Sigma 120-400 I tried in terms of IQ but others may have different views, maybe I had a bad sample. The old Sigma APO TELE MACRO 400/5.6 is a fine lens but hard to find on the s/h market and of course no SDM or full time masnual focus. I've never had the opportunity to tr the Bigma.
Regards, John ________________________________________ From: pdml-boun...@pdml.net [pdml-boun...@pdml.net] On Behalf Of Brendan MacRae [brendanmacrae1...@yahoo.com] Sent: 20 March 2010 00:40 To: Pentax-Discuss Mail List Subject: Re: 400/5.6 vs bigma ? [Scanned][Spam score:8%] ----- Original Message ---- > From: Larry Colen <l...@red4est.com> > To: Pentax-Discuss Mail List <pdml@pdml.net> > Sent: Fri, March 19, 2010 2:30:17 PM > Subject: 400/5.6 vs bigma ? > > 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? Larry, I have the A400mm f5.6. I don't think it translates well on digital, at least so far (this might be reduced on a FF sensor or one with a smaller crop factor than 1.5). I have used it on both the K10D and K20D and there's just too much fringing for my taste. I compared the big Pentax-M 67 400mm f4 IF ED lens on these bodies, as well, thinking that the ED glass might make a difference in the fringing but I didn't see one (though I may have been introducing other issues since that lens was designed for the 67 system). But, since I was thinking of getting the FA 400mm f5.6 which also has ED glass I thought I should try it. You may be better off looking into the long DA primes. They've been designed with the smaller sensor in mind. -Brendan -- PDML Pentax-Discuss Mail List PDML@pdml.net 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 PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
