You know you're a photographer when...

[Charlotte]

You decide to take a quick selfie to show off your new hat and it takes nearly half an hour and involves autopoles:

[Exit Stage Left]

You know when you've still got a residual interest in DIY when you can't resist finding out how much curved radiators are.
http://www.traderadiators.com/acatalog/Ultraheat-Curved-Bay-Radiator-Series.html?gclid=CPap-8_ylbcCFSXItAodBzcAkg

[hellymedic]

You ask yourself "Where does the light come from?" whenever you see an image.

[Flynn]

… Sotheby's value your work at $100,000...

[sojournermike]

You've got a camera that looks like a chimps and you keep it in a flight case with film in the holders rather than on a display shelf full of artefacts.

[hellymedic]

A professional photographer says you've taken 'a particularly nice photograph'.

[Trull]

..someone says "stop" and you think that's halved the exposure time

[T42]

...when a beautiful girl goes past with a camera and you stare at the camera.

[David Martin]

...when you meet someone and afterwards can't describe them or remember their name but can detail every bit of photo kit they had with them..

[LEE]

...you make that rectangle shape in front of your eye with your thumbs and index fingers.

[Afasoas]

...when you meet someone and afterwards can't describe them or remember their name but can detail every bit of photo kit they had with them..

That's a geek, not necessarily a photographer*.

*Okay, so technically anyone who takes photos is a photographer. There should be a distinction...

[T42]

Well, I glanced in my rear-view mirror today and thought for a second "need to reduce the vibrance on the sky a bit".