From comparing the section "low light" in the imaging resource reviews below, it seems that the K-7 meters in low light, at any given ISO:
more than half a stop less sensitive than the D90 (this reduces as light levels decrease)
more than a third of a stop less sensitive than the 50D
somewhat less sensitive than the D300
has similar sensitivity to the 500D
to be more sensitive than the K20D
I think this could mean either that the K-7 is not as sensitive as it is rated or that it's tuned to give a brighter image or a combination of the above?
Having looked at some of the images, I suspect that the K-7 is not as sensitive as the rest and probably similar to the K20d (which, strangely, in those light conditions seems to be tuned to give a brighter image that the K7), although the difference is probably less than half a stop.
If anyone has one of those cameras (the D90 is probably the most interesting as it shows the greatest difference) would you care to compare the difference? (i.e. take shots at the same shutter/aperture/ISO and see which camera produces a brighter shot).
Something else which could be done is to see what the histograms look like for the images - I might do that later.
If anyone has any thoughts about the above, it would be interesting.
http://www.imaging-resource.com/PRODS/K7/K7IMAGING.HTM
http://www.imaging-resource.com/PRODS/E50D/E50DIMAGING.HTM
http://www.imaging-resource.com/PRODS/D300/D300A5.HTM
http://www.imaging-resource.com/PRODS/T1I/T1IIMAGING.HTM
http://www.imaging-resource.com/PRODS/K20D/K20DIMAGING.HTM
http://www.imaging-resource.com/PRODS/D90/D90IMAGING.HTM
more than half a stop less sensitive than the D90 (this reduces as light levels decrease)
more than a third of a stop less sensitive than the 50D
somewhat less sensitive than the D300
has similar sensitivity to the 500D
to be more sensitive than the K20D
I think this could mean either that the K-7 is not as sensitive as it is rated or that it's tuned to give a brighter image or a combination of the above?
Having looked at some of the images, I suspect that the K-7 is not as sensitive as the rest and probably similar to the K20d (which, strangely, in those light conditions seems to be tuned to give a brighter image that the K7), although the difference is probably less than half a stop.
If anyone has one of those cameras (the D90 is probably the most interesting as it shows the greatest difference) would you care to compare the difference? (i.e. take shots at the same shutter/aperture/ISO and see which camera produces a brighter shot).
Something else which could be done is to see what the histograms look like for the images - I might do that later.
If anyone has any thoughts about the above, it would be interesting.
http://www.imaging-resource.com/PRODS/K7/K7IMAGING.HTM
http://www.imaging-resource.com/PRODS/E50D/E50DIMAGING.HTM
http://www.imaging-resource.com/PRODS/D300/D300A5.HTM
http://www.imaging-resource.com/PRODS/T1I/T1IIMAGING.HTM
http://www.imaging-resource.com/PRODS/K20D/K20DIMAGING.HTM
http://www.imaging-resource.com/PRODS/D90/D90IMAGING.HTM