I'm a K-500/4,5 user. It is a beast, and I wish it was sharper, but the CA is tameable. You just need to have a few things in mind. First, fokus is crittical, very crittical.
It also helps to step down. Usually I shoot around f:8, but if I'm able to make a clean shot it makes decant results at 5,6. When talking about a clean shot I'm referring to the background. A nearly in fokus background is asking for trouble. The last, and perhaps most important factor is contrast in the subject it self. Subject with high contrasts definately need stepping down a lot. I'm still in the learing face, but I beleave I will get decent results after a year ot two ;-) Tim Typo Mostly Harmless ----- Original Message ----- From: "F Mckenty" <[EMAIL PROTECTED]> To: "Pentax-Discuss Mail List" <[email protected]> Sent: Monday, June 04, 2007 10:04 PM Subject: Re: ¿¿ 400mm f5.6 ?? (Bird lens) > Thanks for cluing me in on that! > I've been dreaming about that lens for a long time but I guess I wasn't > very well informed about it's actual capabilities. > > Regards, > > Francis > > Kamiel Wanrooij wrote: >> 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. >> >> >> >> ------------------------------------------------------------------------ >> >> No virus found in this incoming message. >> Checked by AVG Free Edition. >> Version: 7.5.472 / Virus Database: 269.8.7/830 - Release Date: 6/3/2007 >> 12:47 PM > > -- > Island Light photography > > www.islandlight.ca > > (250) 935-6785 > PO BOX 241 Mansons Landing BC Canada > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.7/830 - Release Date: 03.06.2007 12:47 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
