Originally posted by randee I have a bit of an odd problem.
I bought a K30 used from guy on craigslist. I was just shooting some test shots. I took a picture of my deck railing, and then switched to potrait and the exposure was way off. The setting were manual. When I switched back to landscape the setting were perfect. It doesn't happen all the time, but quite often. It happens with every lens I have tested.
Here is a couple test shots.
and 3 seconds later...
Even though the exif shows f1.9 on the last shot, I am thinking the aperture was actually more closed down. The depth of field seems greater, which is leading me to think it's an aperture issue...
Anybody ever seen anything like this before?
Thanks!!!
Randy
Yes, you are right. Even though EXIF info is similar on both pictures, by adjusting levels on the second one, You can appreciate depth of field, which is a lot wider than on the first photo. This means only one thing: The aperture closed down fully (or at least 4-5 stops difference) causing underexposure.
What lens were you using?
I know this issue happens "at random" when lenses having aperture rings, are used with the aperture rings actually and not at the A setting. This is fine as long as the metering is stopped down, like on electronic preview mode. By simply putting camera in manual mode, this does not mean the light reading will be accurate.
(SEE LINKED IMAGES, BOTH ADJUSTED. SEE DEPTH OF FIELD COMPARISSON)
https://www.dropbox.com/s/vbaz0nxqfapnpb2/COMPO%202%20PICS.jpg?dl=0
This happens with ALL the camera bodies that have the Kaf2 "crippled" lens mount, which are the ones that lack the mechanical coupler for the diaphragm information. All digital bodies have the crippled mount. For more information on this, read this thread:
https://www.pentaxforums.com/forums/6-pentax-dslr-discussion/200075-pentax-ri...-petition.html
OTOH, if this happened with a newer lens (without aperture ring), or the aperture ring was set on A, then try to reproduce the error with another lens. First you have to pinpoint where (who to blame) for the error; either body or lens.
Let us know your findings.