Larry Colen wrote: > In a related note, I'm curious about how you compare the > K-5 with the 645D. I realize that it's kind of like comparing > a Miata (Mx5, Eunos) with a Corvette, but I'm curious about > which situations each of them excel in. Also, what conditions > does it take for the performance of the 645D over that of the > K-5 to be noticeable, or obvious?
K-5 vs. 645D, well... I think actually that most of the practical differences are deductable from the specs. With 5 FPS, K-5 is the one you want for action shots, whether the athletes have feathers or balls, or both. For the Shake Reduction, K-5 is the one you want for hand-held shots in low light, and for Astrotracing with the GPS unit. For _convenience_ in dark places, K-5 is the one you want for its high ISO properties. On a per-pixel basis I find there's less noise in the K-5, but not that much less. If downsampled to K-5 pixel count, the difference is in favour of 645D files at comparable ISO. But the K-5 does higher ISO than do 645D, so it's easier to stay away from B mode. At long exposures, the 645D also has more of that weird issue with cosmic rays leaving "firefly-marks" than have the K-5. The effect was very noticeable this time around, probably because of the ongoing solar radiation storm. It was quite tedious with the 645D. The K-5 is much more resilient. The image quality is where the 645D shines, though. I haven't been able to really pin it down to technical terms what it is, but working with the raw files, there seem to be just More Of Everything. Pixels, tonal range, colour richness... I may be talking BS here, but at a gut level that's what it feels like working with them. > Looking at the thumbnails on the link above, it's not obvious to > me which was shot by which camera? Ignore the first shot; it's cropped. The rest separates nicely on 3:2 vs 4:3. > In a related note, do you have the O-GPS1? > I would assume that GPS satellite orbits would allow it to work > that far north, but if I were to visit a high school friend of mine > in Anchorage, I may want to play with the astrotracer function > up there. I think you'll be fine. Anchorage is about the same latitude as Oslo, where I live. :-) In November I made a successful Astrotrace shot of the Orion Nebula from the same place as I took these aurora shots. It's about 300 clicks North of here. Make sure you visit on the dark side of equinox though. :-) Jostein -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- 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.
