Svbony SV106 60mm f/4 Guide Scope - F9177BIdeal 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