I'm not sure (I don't use Canon gear) but I think converting a camera to shoot IR is changing the current filter that blocks IR to another that doesn't, so I guess if it's done right you should use any lens. Again, this is just an opinion

The Nifty-Fifty is a must-have for it's low price, small size and great image quality

The Tamron 17-50mm is a zoom, not a prime lens

Actually some stock agencies say they don't need more "people at office" or leaves photos, I imagine their archives are overflowing with those.

fwgx: Indeed! Exactly the opposite of my scenario. The truth is I shoot low key photos more often.

You're right. What I meant was generally speaking G lenses usually have internal auto-focus engine.