I tested the new 24/70/2.8 wide open against a brick wall just to make sure it had no glaring faults. I used the K3 and was amazed at the edge and corner sharpness. Then it struck me: I'm not seeing the edges. I won't know how good it really is until the K1 arrives.
Paul via phone > On Mar 12, 2016, at 1:09 PM, Bill <anotherdrunken...@gmail.com> wrote: > >> On 3/12/2016 11:22 AM, P.J. Alling wrote: >>> On 3/12/2016 10:40 AM, Bill wrote: >>> On 3/12/2016 6:24 AM, mike wilson wrote: >>>>> On 11 March 2016 at 23:04 Larry Colen <l...@red4est.com> wrote: >>>>> >>>>> >>>>> Interestingly, Ricehigh's blog says that the DA 35 macro has severe >>>>> vignetting on full frame. When I put the lens on a film body and look >>>>> through it I don't notice severe vignetting. Has anyone actually taken >>>>> any photos with this combination? >>>>> >>>>> Has anyone tried other DA lenses? >>>> >>>> First thing I did was stick the 18-55 on both the LX and Z1-p. Both >>>> seemed to >>>> show vignetting in the viewfinder below about 24mm. Allowing for >>>> viewfinder >>>> discrepancy, I would expect vignetting on film to begin somewhere >>>> between 24 and >>>> 30mm - probably closer to the former. >>> To get an accurate idea, you would need to either adapt a lens to >>> something like a Sony A7, ot put some film in your Z1p (I presume it >>> allows aperture control from the body) and shoot some pictures. The >>> size of the image circle changes as the lens is stopped down, so a >>> lens that is no good wide open may be OK stopped down a bit (or a lot). >>> >>> bill >> >> Shouldn't just worry about the size of the image circle. That may be >> big enough to cover larger format. But anything outside of the intended >> format size may be poorly corrected for aberrations CA and very soft >> compared to the center of the frame. > > I had an old Schneider 80mm lens that had originally been designed for a > folder of some sort. I adapted it to 4x5. It was brutal until f11, and then > all of a sudden it was stellar. > I think increasing the size of the image circle keeps a lot of edge problems > on the perimeter. I'm sure someone will prove me wrong, I only have one real > world example to go with, and have noticed in many cases that lenses that > have poor corner performance wide open do get better, often significantly if > they are stopped down. > > > bill > > -- > 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.
