I doubt these lenses do any worse on digital than they did on film. We are just looking more closely at the results. If the sensor resolves the lens we don't need AA filters. Even more resolution might open the door to some interesting signal processing.
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 >> -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. -- 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.
