Quote:
Originally Posted by baddog
I find myself using A-Dep most often for say parties, where it is more important to get the background action. Auto-ISO is my standard.
When I go to shoot waterfalls and stuff like that I experiment with AV and adjust the ISO and F-stop.
I use a Sigma 18-200 most of the time, which is a 5.6 lens. Someone told me I should go two steps up, so I have been using 7.1 on the F.
Right? Wrong?
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Lenses have a sweet spot especially telephotos. A telephoto lens has to do a very tough job and it cannot be perfect across the whole telephoto range so there tends to be a sweet spot with them. F8 will usually be a good rule of thumb to produce the sharpest images that the lens can produce. The focal length too will have a sweet spot or range, but that's very dependent on the make and type of lens.
Prime lenses have a fixed focal length and they generally will produce the sharpest images as they are not having to work over varying focal lengths.