In anticipation of getting my new XSI, I decided I had to learn something about settings other than auto. I've been playing around some.....have taken several shots inside, without flash, using manual that were fairly decent. Today, I've been playing with Shutter Priority. Here's what I've done so far. These are SOOC except for a 3 X 3 crop. What do you think? Think I'll learn it? I have to admit, I rely on the histogram, because I don't fully understand the settings yet.
Sunny,
I think that for the type of images you are taking, I would normally be using Aperture Priority – unless there is a strong wind, the flowers aren’t going to be moving.
I would suggest trying the same shot – with a tripod for comparison purposes – at f2.8, f5.6, f11, f22 or in that range. Also, look at the difference with your lens set at wide angle, and mid to max telephoto.
These settings and lens settings will let you see what happens to depth of field under these varying camera settings and the differences can be profound.
Playing with these will help you learn when and how to control depth of field.
For Shutter Priority, think of things that move – like water, cars or kids on swings. A slow shutter speed on water will make it look silky, a fast one will freeze the individual sparkles.
Ultimately, it will depend on what effect you want to achieve that will tell you how to set your camera. Basically, all these different settings do is bias your camera into a different image capture strategy.
P.S. - If you use a tripod, don't forget to turn off IS - Image Stabilization.