Answer is the one you have with you. I’m a Hobart photographer currently visiting Adelaide. Yesterday it was 40 degrees – it wasn’t too bad. I’m on holiday and these days I don’t lug my big cameras around, I use my iPhone. As you can see this is a perfectly suitable image. I wouldn’t photograph a wedding at a conference with my iPhone, but for “snaps”, it’s the old rule, the best camera is the one you have with you…