The way I shoot is this:
- turn the camera so that the subject is in the middle of the viewfinder, where my center point is,
- press the shutter half way, the camera now focuses the lens on the subject and changes exposure parameters (e.g. shutter speed),
- I recompose, holding the shutter half way (turn the camera so that the composition looks right to me),
- take a picture (press the shutter as much as possible).
How else can you take a picture? I've heard of the AE-L/AF-L button and while I think I know what it does, I don't know how and when to use it. Also, why would you want to decouple focusing and exposure metering? When I want something focused, I also want it to be properly exposed. Are there other use cases?
I've recently read this:
The AE-L/AF-L button is placed similarly as on the D90 – further away from the rear rotating dial. I wish it was closer or there was a dedicated AF-ON button like on the pro-level bodies, because I usually move the focusing action from the camera shutter to a dedicated button (for focusing and recomposing shots).
So what is he talking about and what are some other ways to shoot and when should you use it?