Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon EOS dSLR

Thread Tools Search this Thread
Old Jan 20, 2007, 1:11 PM   #1
Senior Member
D.Ann's Avatar
Join Date: Jun 2006
Posts: 2,932

In experimenting with my 30D, I shot a plant on a table in program mode and the camera chose the settings: shutter speed, 250, Aperture 4.0. I then changed it to shutter priority and set the shutter to 250, but the camera chose the different aperture of 2.8. The I shot in aperture mode and set the aperture to 4.0 (like in program) but it chose the shutter speed of 200. Why wouldn't the settings be the same as program mode when I chose one of the corresponding shutter or aperture settings. Nothing else changed. All taken within a few minutes of each other, nothing else changed except the shutter or aperture. Donna
D.Ann is offline   Reply With Quote
Sponsored Links
Old Jan 20, 2007, 3:11 PM   #2
Senior Member
Mugmar's Avatar
Join Date: Jul 2005
Posts: 3,194

Hi Ann,

Glad you are enjoying your camera. I have not messed around with the program mode much, but your question got me wondering.

I just set the camera on a table and checked the exposure settings in P, AV, and TV at ISO 200 and the shutter-speed and aperture were the same in all three. When I went to the full auto mode (green box) It changed every thing including the ISO up to 400. So the actual exposure was the same just different setting that the camera thought was best.

Hope this is what you were looking for.

Mugmar is offline   Reply With Quote
Old Jan 20, 2007, 3:51 PM   #3
Senior Member
Join Date: Oct 2005
Posts: 1,105

even a slight change in light on the plant could change the settings as the camera tries to meter for the current point of focus

Maybe u shud try testing in a more controlled environment.

nymphetamine is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 2:12 PM.