rangefinder

• range finder

From range +‎ finder.

rangefinder (plural rangefinders)

1. Any of several designs of optical (or other) instrument that is used to measure the distance to an object
2. (photography) Abbreviation of rangefinder camera.

• RF (abbreviation)

(photography):

• DSLR, ZLR, SLR, P&S/PS
• single-lens reflex, digital single-lens reflex, point-and-shoot/point and shoot
• single-lens reflex camera, digital single-lens reflex camera, point-and-shoot camera/point and shoot camera

• (photography):   rangefinder camera on Wikipedia.Wikipedia