.
Had my 35 primes on each body today, and a little bit of free time, so I took
some comparative shots.
The D90 tends to attempt to extend DR, and can blow highlights - as
a result, most shots from the D90 look 'brighter' even though aperture
and shutter speed are the same. (some of this could also be attributable
to a slight variation in actual lens speed - the Nikon 35 1.8 was stopped
down 2.3 stops, the DAltd was wide-open (both f/2.8)
Also, these were cropped in picasa with native resolution retained, so
in the tighter crops, the resulting K20D image is bigger, even though the crop
area was the same. So this shows the effect of 14MP vs. 12, also.
On all these, Pentax is on left, Nikon on right, and in the following
crops, the Pentax crop appears first.
Pentax is warmer, chair colors more accurate here:
Crops:
100%
Here's where you can see the loss of detail because of a slightly blown highlight
(the rabbitt on left.) At the same time, more detail is available to
downsized images in the shadows in this D90 shot.
The Pentax DA 35ltd wide-open + K20D matches the Nikon 35 1.8 in sharpness
even though the Nikon is stopped down more than 2 stops. The D90 should
probably be shot at -0.3 or -0.7 to mitigate the effects of DR tweaking and
make it a more equal exposure situation, but this is the default behavior
demonstrated, also.
.