My first digital experience was with Pentax full frame lenses on an *istD. It was not pleasing. CA and fringing were frequently a problem. I never owned some of the best full frame lenses, but I came away from my early digital efforts convinced that new lenses designed for APS-C digital were the way to go. I now use DA* lenses almost exclusively on my K-5, and I'm extremely pleased with the performance. Looking forward to trying them on the K-3. I expect they'll make a great team.
Paul On Oct 16, 2013, at 1:21 PM, Dario Bonazza <dario.bona...@virgilio.it> wrote: > Practical experience shows that the best old FF lenses are quite decent > performers on APS-C sensors, sometimes comparable to good 'digital' lenses > (at least up to 12-16 megapixels), except for a typical higher CA and purple > fringing. That's because you get rid of the weaker part of their image > field. Oh, and that only applies to focale lengths around 35mm or longer > (most if not all older wide-angle lenses are much overperformed by current > APS-C digital sensors). > On the other hand, I still have to find a single 'analog' lens which is > comparable to newer lens designs on FF sensors with a pixel count of 24 or > 36 MP. > Heck, even most FF digital designs cannot cope with the D800 sensor! Sure > you can use whatever lens you like on a modern FF DSLR (provided you can fit > and focus it), but don't expect to exploit their potential. > > Dario > > -----Messaggio originale----- From: J.C. O'Connell > Sent: Wednesday, October 16, 2013 6:57 PM > To: Pentax-Discuss Mail List > Subject: Re: K3 problem using flash and AA > > My Reply : I disagree with regards to full frame. As long as the corner > performance of the FF lenses > matches 2/3 of the performance of the APSC lenses the overall system > performance of FF will > be equal to or greater than the Aps performance. Generally speaking, > you dont need as high a > performance FF lenses for better overall system performance than apsc. > Its a larger format, it has > more overall lines of resolution even if the absolute line pairs/mm is > lower. > > > Regard no AA filter, aliasing occurs when the incoming spatial > frequencies are too fast > for the sampling. With a high resolution sensor and cheaper lower > resolution lenses, > NO aliasing will likely occur. Aliasing is more likely to occur with > super high spec ultra > high resolution * or APO lenses, not average or poor ones. > > > > On 10/16/2013 9:38 AM, Dario Bonazza wrote: >> Darren Addy wrote: >> >> Cameras with no AA filter are going to separate the "men from the >> boys" as far as lenses are concerned. It is going to make APO and Star >> lenses almost mandatory. Either that or you are going to have to >> "enjoy" a lot more time in post-processing. This problem is >> exacerbated by a full frame sensor which uses the corners of the image >> circle that are getting cropped out by an APS-C camera. In short, >> those who want a full frame DSLR are either going to have to use their >> best lenses with it, or procure some. >> >> My reply: >> >> I keep telling that to all those funky boys begging Pentax for a full >> frame camera and counting on good lenses of the past they already own and >> treasure. Once FF will be available, you'll have to buy a whole new lens >> outfit based on new-generation lenses (provided they will be made >> available) or be satisfied with so-so performance. >> >> That's well known by Canon and Nikon shooters, and mostly neglected among >> dreaming Pentaxians. In brief, putting together a Pentax FF outfit won't >> cost you less than switching to Canon or Nikon, the advantage being you >> won't have to do that all at once. >> >> Dario >> > > > -- > J.C. O'Connell > hifis...@gate.net > -- > > > -- > 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. > > > ----- > Nessun virus nel messaggio. > Controllato da AVG - www.avg.com > Versione: 2013.0.3408 / Database dei virus: 3222/6755 - Data di rilascio: > 16/10/2013 > > -- > 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.
