Home › Words › F › focuserfocuserfocuser means A device which allows one to adjust the focus of an instrument such as a telescope.EtymologyFrom focus + -er.nounA device which allows one to adjust the focus of an instrument such as a telescope.e.g.“I decided to upgrade my telescope with a feather-touch focuser.”Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.focalize 65% match — To focus, or to adjust a focus. vs focuser →focimeter 63% match — A lensmeter (optician's instrument). vs focuser →finderscope 59% match — A small telescope, or other sighting device, mounted on top of a main telescope to enable approximate directional positioning. vs focuser →focusing 58% match — Used for or pertaining to focusing. vs focuser →refractor 56% match — A refracting telescope. vs focuser →telextender 54% match — An optical amplifier, used especially in amateur astronomy to magnify an image. vs focuser →cofocus 54% match — An element in a clause, sentence, etc. that acts as the focus, or main element, in combination with another such element. vs focuser →telescopist 53% match — Someone who uses a telescope. vs focuser →