 BetterPhoto Member |
Viewfinder Does Not Equal Image I have a Canon Rebel XTi. When I look through the viewfinder using the Av mode and a high Fstop (35), the viewfinder shows foreground items very focused and background completely unfocused, even when holding the trigger halfway. Then I take the pic, and the resulting image has both foreground and background in focus! Why is this? Shouldn't what I see in the viewfinder and the resulting image be equal?
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Stephanie M. Stevens |
What's happening is that the lens has to open up in order for there to be enough light for you to see anything. Then when the picture is taken it closes down to the aperature you set. If it kept such a high f-stop number (small aperture) while you were looking through the viewfinder, it would be too dark for you to compose the picture. Use the Depth of Field preview (look in your manual) to see how sharp everything will be in the final image.
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Jon Close |
Right. Normally the lens aperture is wide open for viewing/focusing/metering. You want as much light as possible through the lens for those purposes. You can close the aperture down to the desired setting and see the effect through the viewfinder. Just press the Depth of Field Preview button (p. 70 of the manual).
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