I got my K-5 yesterday, and I thought I'd test it against the k-7 for iso performance in very poor light (check the exif).
EVERYONE BY NOW KNOWS THE k-5 IS BETTER AT HIGH ISO, BUT I WANTED TO SEE HOW THEY COMPARE AT ISO BELOW 3200.
DO NOT COMPARE SHARPNESS BETWEEN CAMERAS, ONLY HOW SHARPNESS HOLDS ON AS ISO IS INCREASED - This is because, sharpness is greatly influenced on accuracy of focus, and having done several tests, I know it can never be gotten exactly right inspite of everything I try. But, as the focus was kept the same between iso's the decrease in sharpness as iso is increased is not due to focus issues.
Methodology.
- 2 sec timer
- Tungsten WB
- Manual Focus using LV magnification
- First I did the K-5 in Av mode and found it needed +1 EV to get the exposure right and then the K-7 was done in M-mode with the same exposure parameter (same iso, aperture and shutter as that of K-5) - As the aperture, iso and shutter are the same between images, the +EV has no bearing.
- DNG RAW files were opened in LR3 and then just woith default setting saved.
- The full image is a crop with the long edge being 1000 pixels.
- The crops are 100% crops
THE TOP IMAGE IS k-5
iso 100
iso100
iso200
iso200
iso400
iso400
iso800
iso800
iso1600
iso1600
iso3200
iso3200
iso6400
iso6400
iso12800
iso25600
iso51200