My autoguider is a QHY-5L-II with a Mini-Guidescope. Tossed it on the tripod, no tracking, for a quick EAA session
Sub-exposures 2 seconds... live-stacked in SharpCap Pro, B33 is visible after approx 20 seconds.
A 12" scope is the smallest diameter that I can clearly see B33 the Horsehead nebula visually without filters. 8" with an H-Beta filter.
A QHY Mini Guide Scope is 30mm (1.18") aperture, 130mm focal length. Light gathering area... 1.09 square inches. vs a 12" scope, with 113 square inches.
Makes for a small rig to toss in the luggage on business trips.