aperture

(redirected from Aperture stop)
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References in periodicals archive ?
If you have a large Dobsonian, it will probably do best on doubles like this with an off-axis aperture stop.
Observers working with large instruments can achieve the same effects by using a cardboard aperture stop.
Curious about the minimum aperture required to discern the Cassini Division, on a night of steady seeing Knisely experimented with a series of off-axis aperture stops fitted over the tube of his 10-inch Newtonian reflector.