As the weather gets colder, I find myself doing more indoor shooting.
I try not to use the built in flash on my 20D, as the pictures look a bit on the harsh side, and I sometimes get anoying reflections from the flash.
I am using the 24-70 F/2.8 and usually open up the aperature, and crank up the ISO from ISO 800 to 3200. However, when I do this the pictures come out on the soft side (grainy looking).
Camera shake can be a problem to, and I am more limited when it comes to selecting a higher shutter speed.
I am thinking I need a good flash with a diffuser. What are the key things I need to know about shooting with a flash?
What models/features do you recomend.
I was thinking maybe a 420EX...
What good would it do me to buy, say a 550 or 580EX?
What capabilities would I gain that I cannot live without ?