Are you talking about the aspect ration of the photo? I generally keep my at 2:3 but I'm not afraid to change it if the image looks better a different way.
"I thought that because fewer wolves meant more deer, that no wolves would mean hunters' paradise. But after seeing the green fire die, I sensed that neither the wolf nor the mountain agreed with such a view."
Aldo Leopold
I crop mine to include what I want in the image. The ratio is what it is. - TF
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I am no better than you. I critique to teach myself to see.
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Feel free to edit my photos or do anything else that will help me learn.
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Sony/Minolta - way more gear than talent.
Usually, what I shot it at.
So from the Canon 1D my prints are at 8x12 (3:2 ratio).
From the micro 4/3 (E-P1 and GH-1) it depends on whether I can be bothered to crop to 3:2 ratio or not.
And when it's not being printed, what OldClicker said
The camera's aspect should be set at the setting which gives you the maximum resolution. You can always crop post process if needed. If you have a DSLR camera you do not have a choice.
GRF
Panorama Madness:
Nikon D800, 50mm F1.4D AF, 16-35mm, 28-200mm & 70-300mm
The camera's aspect should be set at the setting which gives you the maximum resolution. You can always crop post process if needed. If you have a DSLR camera you do not have a choice.
Max Resolution is the key.
With newer DSLR's including Mahopac's Olympus cameras they do have multiple (8 or 9 on the E30) selectable aspect ratios!
(one more setting-yikes!)
A 4/3rds camera like the E30 should have the aspect ratio set to 4:3 for the 'most' information to be captured with RAW mode images. There is some provision for that anyway with post processing that I do not know all the details of and it does depends on software.
A cropped in camera 'non-native' aspect ratio will just crop out information that can't be recovered. Of course that is just one more reason to not shoot jpegs.
In post processing you can select whatever you want for print or display and still have options later.