ZWO 30 f/5 MINI GUIDE SCOPE radius block 7x Reducer is a 4-element

7x Reducer is a 4-element corrector for the EdgeHD 8" telescope

This is because the absorption of the extra neodymium ions would be too great in thicker glass

25" filters and adapters

with better chromatic correction and field flatness

The Mewlon 250CRS has a native focal length of 2500mm and a focal ratio of f/10

ZWO 30 f/5 MINI GUIDE SCOPE radius block 7x Reducer is a 4-elementThe ZWO 30mm f 5 Mini Guide Scope is a lightweight, compact, and precise solution for guided astrophotography. Specially designed to complement ZWO guide cameras such as the ASI120MM Mini or ASI174MM Mini, this guide scope offers excellent optical performance in a portable format. With a 30mm aperture and a 150mm focal length, this telescope has an f 5 focal ratio, allowing you to capture bright guide stars easily and sharply. Its achromatic doublet