Quote Originally Posted by photo144 View Post
I've always thought that your pictures had to be tack sharp and able to be blown up to 16X20 without much quality loss. But without using medium to large format can you achieve acceptable results.
Your title asks: "Best format for street shooting," the body of your post asks something else.

If you want tack sharp 16x20 you probably need 6x6 and larger, be careful with camera support and exposure, and I assume that out of focus areas don't need to be tack sharp.

That isn't really a good foundation for street photography, but one way to shoot street is to stake out an area and wait for the world to come to you.