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Answer for the clue "Having a narrow slit ", 9 letters:
stenopaic

Word definitions for stenopaic in dictionaries

Wiktionary Word definitions in Wiktionary
a. (context optics English) Of an optical eyepiece, having only a narrow opening, so as to increase the accuracy of the sight.

Usage examples of stenopaic.

A vertical plane drawn through the center line of the bore-hole of the cannon and that of the slit, if produced, intersects the center line of a quartz lens, and coincides with the center of a stenopaic slit and the axis of the revolving drum carrying the film.

The photographing apparatus consists of a shutter, a quartz lens, and a stenopaic slit, 76 by 1.