70-90 mm refractor guides

4 guides, newest first. Each guide is written for this class of instrument.

Ptolemy Cluster (M7) with a 70-90 mm Refractor, Compared with M47Star clusters · 70-90 mm refractor14 Oct 2026
Star-Hop to Winnecke 4 (M40) with a 70-90 mm RefractorDouble stars · 70-90 mm refractor14 Oct 2026
M50 Open Cluster with a 70-90 mm Refractor: Common Mistakes to AvoidStar clusters · 70-90 mm refractor14 Oct 2026
Saturn in a 70-90 mm Refractor: What You Will Actually SeePlanets · 70-90 mm refractor2 Oct 2026