* Known error disclosure. A proper ISO 400 shot for the Pentax K5 was missed. An ISO 800 shot, pushed only +3EV has been substituted in this chart until such time as I can get a proper ISO 400 file. It would be difficult to tell the difference, however.
All the sample crops below are normally taken from the upper left
part of the frame. In the case of the Pentax 645D the crop was taken
from the top-center of the frame. This is to present an interesting
anomaly visible in the reduced full frame image which divided the
right and left halves of the frame with a subtle difference in the
noise characteristic at higher ISO settings.
When I get around to publishing the reduced full-frame images you
will be able to glean some interesting information from them as they
depict larger scale noise patterns which provide some clues to the
sensor and electronics within the camera.
Thanks to my local camera shop and the various manufacturer rep's who kindly allowed me to obtain many of these files using their demo cameras.
