Reworking old lens formulas might not work. The optimum image circle isn’t the same. And there’s something about the older lenses that causes fringing. Clean sheet new designs are probably a better direction. In my experience, the new zooms are better than most of the A and FA primes.
Paul > On May 18, 2018, at 9:46 PM, Mark C <pdml-m...@charter.net> wrote: > > Gonz wrote: >> I think where >> Pentax is lacking is in a system. They last had a complete system >> back in the LX days. Unless you plan on using only zooms, their prime >> offerings are mostly still from the film era like the Limited series, >> or the DA lenses that can sometimes be used in FF. But say I want a >> very wide prime? The only options are used older film era lenses >> (15mm 3.5). > A lot of the old film era lenses are great on digital bodies, but some > aren't. I wish Pentax would curate a set of FA lenses that work well with the > K1 and give them an upgrade to shake off the perception that they are past > their prime and also to offset any uncertainty about how they will work on > digital bodies. By "update" I mean reissue with newer coatings (HD), replace > cam AF with SDM, maybe make them WR. Reissue FA limiteds as DFA limiteds - > but only reissue the ones that are truly excellent on digital bodies. Rework > some of the APS_C glass, like the 60-250 f4 - that were designed to be full > frame but don't quite cover the entire full frame sensor to make them > compatible with FF bodies. > > I don't know how lenses are made but it seems to me that upgrading existing > lenses would be more cost effective than designing new ones. And it would > yield the dual advantage of shaking off that perception that "its an old > film era lens" and also overcoming uncertainty about how well it will work on > digital bodies. > > If Pentax really wanted to work it, they reissue some classic optic designs > in upgraded modern form. Like the Takumar 135 f3.5 as an SDM AF HD WR > lens... or K 24mm f2.8. Keep the optical formula but upgrade them to AF etc. > People want the newest and most advance tech, but they are also drawn to the > retro classic historical stuff. > > Made for digital neo-Takumar DFA Limited lens with all the bells and whistles > - and great optical performance - could be real winners. > > Mark > > --- > This email has been checked for viruses by AVG. > https://www.avg.com > > > -- > 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.
