Svbony SV106 60mm f/4 Guide Scope - F9177B 81 mm Refractors The f/ratio of the SQA55

The f/ratio of the SQA55 can be set anywhere from f/22 to f/4

by the nature of its negative power lens

if you would like a faster system

and will reduce the overall focal length to 280mm and the focal ratio to f/3

Viewing through the Celestron TrailSeeker ED 8x42 binocular is comfortable for both eyeglass wearers and non-eyeglass wearers

Svbony SV106 60mm f/4 Guide Scope - F9177B 81 mm Refractors The f/ratio of the SQA55Ideal as a Guide Scope or Finder Scope! When you're not imaging, this versatile 60mm guide scope can be used as a straight through finder scope by adding a 1. 25" eyepiece, making it a multi functional tool for both astrophotography and observational use. Built in Helical Focuser for Zero Flexure Featuring a built in helical focuser, this guide scope allows for zero flexure during focusing, providing a rigid, stable performance while enabling quick