BTW, fascinating to hear that the M*300 is so corrected. I expected 1 ED element, not 3.
On Tue, Oct 1, 2013 at 10:00 AM, Zos Xavius <zosxav...@gmail.com> wrote: > That element is bad, but not bad enough to destroy sharpness. I bet > there is certainly some loss in contrast on that lens. Also night > shots or anything with point light sources in the frame would be very > problematic IMO. > > On Tue, Oct 1, 2013 at 9:26 AM, Darren Addy <pixelsmi...@gmail.com> wrote: >> While doing a little research on the M* 300mm I purchased from CollinB >> I tripped across this amazingly abused A* 300mm (same optical >> configuration). Don't look if you are squeamish about the condition of >> your lens optics: >> http://forums.steves-digicams.com/attachments/pentax-lenses/147886d1264764384-test-shots-300-scratchedlens.jpeg >> >> Here is the amazing part: Check out the images it still produced in >> this condition: >> http://forums.steves-digicams.com/pentax-lenses/165305-test-shots-300-a.html >> >> The main reason I decided to try the M* 300mm is for astrophotography. >> You can get away with a lot of imperfections in daylight photography, >> but pinpoint star images highlight every defect. The M* and A* 300mm >> f4 featured 3 of the front 4 lens elements made of ED glass (although >> marketing departments had not yet seized on the use of "ED" in the >> lens nomenclature). Other elements are made of high refractive glass. >> In fact, only two of the 8 elements are "normal" glass lens elements. >> For a film era lens, it is pretty highly corrected for chromatic >> aberration. >> >> 300mm is pushing the limit for use with the O-GPS1, and I'm not even >> going to attempt it until I get the Arca-Swiss p0 purchased. It may >> even have to wait for the purchase of a "real" equatorial mount that >> can respond to auto-guidance (the purchase of which is a loooong way >> off yet). But I couldn't resist snagging the lens when Collin offered >> last Friday. It should be in my hot little hands on Thursday. >> >> -- >> Nothing is sure but death and Pentaxes. >> >> -- >> 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.
