I did a quick experiment yesterday with my bigma and teleconverters, and posted some examples and my notes at dpr:
http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=31052869 The question was, for extreme telephoto am I better with cropping, or using a teleconverter, or multiple TCs. The answer seems to be "it depends". It seems to depend on a lot of factors, and I bet that the results would be different with a 14mp K20 than with my 6mp K100, or a D700. Despite the rig being on a tripod, I also probably should have tried bumping the ISO, or maybe even under exposing some more. I think I still got motion blur. http://www.flickr.com/photos/ellarsee/sets/72157614103063616/ I could also try some tests at night, with a resolution chart target and a flash to minimize motion blur. Then again, there's optical performance and real world performance. It's still fun to play with. The real result is that if you need that much magnification, you aren't going to get clear photos "on the cheap". It's still fun to experiment with to get some idea what the limits really are. -- It's not the steps in the dance, it's the dance in the steps. Larry Colen [email protected] http://www.red4est.com/lrc -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
