Mark, Beautiful shot. Love the blue and the moon. Regards, Bob S. On Tue, Aug 23, 2011 at 8:08 PM, Mark C <pdml-m...@charter.net> wrote: > Interesting note on the different versions of the Sigma lens. I assume I > have an older version - bought it in 2002 and it has very poor close focus > features. So hopefully it is one of the good ones! > > It does have one quirk - in very cold temperatures the aperture opens up and > won't close. I posted on this many, many moons ago - I was shooting a > lighthouse in single digit (Fahrenheit) temps and only the first 10 frames > or so out of the 3 rolls I shot came out. All of the other slides were > totally clear. Trying to diagnose the problem, I put the Sigma lens in my > deep freeze at home and found that the cold temps made the aperture open up > and not close. Obviously, if the lens can't stop down everything is over > exposed. > > I spent about an hour standing on an ice dune in a stiff breeze taking > useless photos - when I got back to my car I dropped my keys and discovered > that my fingers were too stiff to pick them up! I finally managed to get in > the car and went to have coffee with some other nutter who was also out > photographing the scene. > > It's a nice lens other than that quirk - I should try to use it but can't > remember the last time I did. > > Here's one of the first 10 photos from that morning: > > http://www.markcassino.com/newsite/portfolios/lighthouses/pages/030301.htm > > - MCC > > On 8/23/2011 1:36 PM, Joseph Tainter wrote: >> >> I haven't posted here in a while, but this questions looked like a good >> opportunity. >> >> As someone posted, Pentax's FA* 80-200 F2.8 is just excellent. It is also >> expensive and hard to find. >> >> Some versions of the Sigma 70-200 F2.8 are also quite good. Unfortunately >> Sigma messed around with the optical formula, and some recent versions >> weren't as good. At one point they added "macro" capability, which caused >> images at 200 mm to be softer. If you can find an older version of it, that >> is a very good lens, though not as good as the Pentax. >> >> I don't have the DA* 60-250 F4, but as also posted here, it is reputed to >> be excellent optically. I just don't trust SDM. >> >> Joe >> >> > > > -- > 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. >
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