Hi, Regarding the 500/4.5 from Pentax. I have the lens (there is one for sale in the Netherlands for around € 500) and must say I am not that satisfied regarding sharpness and CA. Might be my focusing skills, but I never managed to get a 'crisp' image out of the lens. Also, in almost every image clear purple/blue/green edges can be seen when looking closely. Although a long, big lens for an affordable price, and it really helps me get the shots I want, it is probably not the best in the (price)range. I have no experience with the 400/5.6 though...
Just wanted to share my experiences. Regards, Kamiel Wanrooij -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Sessoms Sent: Monday, June 04, 2007 5:53 PM To: [email protected] Subject: Re: ¿¿ 400mm f5.6 ?? (Bird lens) > > From: > Doug Franklin > John Whittingham wrote: > > >> > If it need not necessarily be a genuine Pentax lens I would recommend the >> > Sigma 400 f/5.6 APO, pretty sharp wide open, great build quality, CA >> > should >> > be non existant as it's an APO lens. There's a test on the Canon fitting >> > version here: >> > >> > http://www.photozone.de/8Reviews/lenses/sigma_400_56/index.htm >> > > I have the Sigma APO 400/5.6 in Pentax K-AF mount and I've been quite > happy with it. I haven't noticed any particularly tendency toward CA, > but I haven't looked for it, either. Where might one find such a beast? It's not in the current Sigma lineup. OTOH, Sigma is apparently offering its newer DG 500mm f/4.5 in a Pentax AF mount (B&H lists it as "New, Arriving Soon). If I understand, this is a new design that replaces the previous 500 f/4.5 which Sigma had stopped offering in Pentax mount. I have the previous version Sigma 300 f/2.8 and it's a fantastic lens, especially compared against similar lenses at higher price ... so if the DG lenses are improved beyond that, they ought to be very good indeed. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
