Correction: underexposed by 1.6 stops.
Godfrey
On Oct 12, 2005, at 2:18 PM, Godfrey DiGiorgi wrote:
Operator error:
The SMC-Pentax 28/3.5 lens is not a Pentax-A lens, so in Av mode it
will ONLY operate at f/3.5. The EXIF data should not have ANYTHING
for f/stop on this lens as there is no communication between camera
and lens, the camera will simply have F/-- on the display.
So ... If you snap a photo with the camera set to Av mode, aperture
ring at f/5.6, and the shutter speed shows "1/60" second, then
switch the camera to Manual mode, same settings, AND the Av
exposure is correct, the Manual exposure will be underexposed by
1/6 stops.
Godfrey
On Oct 12, 2005, at 12:19 PM, Shel Belinkoff wrote:
SMC-Pentax 28/3.5
Shel
On Oct 12, 2005, at 11:37 AM, Shel Belinkoff wrote:
Here's the situation. I was checking the results of a CLA on one
of my
lenses. Mounted the DS securely on my desk, set and locked
exposure to
1/60 sec @ 5.6 with ISO of 200, took a few snaps of the wall.
This was in
Av mode. Changed to full manual, exposure set to 1/60sec @ 5.6,
200 ISO.
Exposures look to be about one stop apart. Results like this are
unacceptable. Tried the scenario a number of times, making sure
to hit the
AE-L button, making sure settings did not change, etc. Must have run
through 50 or so exposures testing this. The camera consistently
under
exposes when in manual mode compared to using the same settings an Ap
Priority. Any thoughts?
Shel
"Am I paranoid or perceptive?"
