I've purchased a Sigma 24-70 2.8f macro lense for my 350D last night.
I bought the lens as a general walkabout lens, to use the macro facility, but specifically to use at a friends christening in a church in September.
I fired off 50 or so shots indoors last night and noticed that it hunted around quite a bit more than my canon lenses and that sometimes it would not focus. Also it seems to focus a little bit before the subject. I'm unsure if it is me or the lens. As I'm new to the 350D I mainly use P mode with the autofocus setting on the central point. I'm going to practice in the meantime and intend to take it outdoors and then into a church to practice for the christening.
I'm looking for advice on how to get the most out of this lense, what to expect (the DOF is different to the kit lense I've been using) and if I can do any tests to ensure it is focusing correctly or if it is my technique. Generally how to get the best out of this lens.