Camera: cámara
Flash: flash
Tripod: trípode
Composition: composición
Smile: sonríe/sonría/sonrían (imperative form of "sonreír")
Say cheese: dí/diga/digan "whiskey" (in Mexico)
Lens: lente/objetivo
Film: rollo de película
Shutter: obturador
Shooting: disparo
@Piki: I suggest you to read camera manuals in Spanish so you can find specific vocabulary that cannot be given in lists... most of them can be found online at the camera brand websites.
