First....I have not heard of a Canon A450.
I will assume you mean Canon SD450.
As far as overall picture quality and sharpness, here is how I would rank them:
1. A tie: Olympus Stylus 710 and Sony W70
2. Sony W30
3. Canon SD450
Which brand is better for amateurs;
Sony, Canon or Nikon?
I am looking for a dig. camera. I have used many before but never owned one. I like to take nature pictures (long and short range), along with everyday use. I need to take some quality pictures (even with zoom) for a portfolio asap. I am confused between Sony Cybershot DSC-W70 or W30 and Canon A450. I also recently looked at Olympus Stylus 710 so I am completely lost now. Also which one would be better for amateurs: Sony, Canon or Nikon?
Any help is appreciated. Thanks!