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Your 450D will stop down the aperture just before the picture is taken, so it doesn't matter if you (or the camera) sets f1.8 or f22
I discovered this when trying to take photographs through a chain link fence in bright sunshine. Looked great through the viewfinder, no fence evident- operate shutter, fence!
A moment of confusion followed.
Dammit
salad
This does not make any sense.
Your 450D will stop down the aperture just before the picture is taken, so it doesn't matter if you (or the camera) sets f1.8 or f22
(we're talking about autofocus lenses, right? The finder does not get darker, as you change aperture, right?)