Thanks for the advice, Mark. I did end up buying the lens yesterday after testing it - no purple fringes. On the K3 my example is tack sharp when taken down two stops, and a little softer at F2.8 when viewed at 100%, bit that is to be expected.
I also took some test shots on my "full-frame" camera (the MZ-S), but it will be awhile before I am able to examine them... So I am pleased for my C$225. If the aberrations turn out to be too much when I get a full-frame DSLR...well, I'll cross that bridge when I get to it. Now the seller is trying to convince me to buy a 4X5 camera that he has (actually he has four)... Again, thanks to everyone who helped me in this! On Mon, 23 Oct 2017 16:50:52 -0400, Mark C wrote: > I have the 1st generation Sigma 70-200 f2.8. IMO its excellent on a > cropped sensor. It if very good on a full frame camera but does show > slight softness around the edges. > > Here is a link to a full sized sample image taken on the K1, so you > can judge for yourself: > > http://www.markcassino.com/temp/MCCP1875.jpg > > That image is untouched, except for bringing up the shadows in ACR. > Not cropped - hence the crooked horizon line. If you look very > closely along the outer edges, especially the water on the left, you > can see some slight astigmatism. When used on an APS C body, the > slight defects are cropped out. You can also see noticeable light > fall off in the upper corners of the sample image - again not an > issue on APS-C. > > I have not had issue with flare with this lens. The only issues I've > had with it are that the minimum focusing distance is not very good - > about 6 feet - and at temps below 0F (-18 C) the aperture > malfunctions. > > After testing I decided to keep this lens with the K1. If a 70-200 > was my main workhorse I would probably upgrade though, if only for > closer minimum focusing distance. > > Hope this helps - > > Mark --- Steven Sharpe - The Office Gallery d...@eastlink.ca -- 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.
