QUOTE(ComradeZ @ Nov 18 2010, 02:27 PM)
rofl another professor has just started working his bun off
I heard it alot from a SG-rian~ not that I'm not SG-rian myself

Why, thanks for exalting me to professor status. It's such a prestige and lofty ideal to be a professor at my age.
QUOTE(sniper on the roof @ Nov 18 2010, 02:46 PM)
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What you see on the viewfinder is always at the len's biggest aperture. Let's say u use a small aperture like f/16, the dof preview button allows you to preview the dof (duh

) at f/16.
Not always. The viewfinder doesn't become any brighter even when the lens is brighter than about f/2.8.

AE lock means you want the metered settings to be applied for another scene that you're going to point the camera at.
i.e You point the camera in a dark spot. The camera meters for 1/5s. You point the camera in a bright spot. The camera meters for 1/100s. With AE lock, you point the camera in a dark spot, press it, and lock the metered 1/5s settings. Now you can point the camera in a bright spot and shoot at 1/5s.