TESTAR 30mm f/4 MINI GUIDE SCOPE tripod extension The flange-sensor distance is often

The flange-sensor distance is often equal to 55mm and it must be precisely calculated in order to maximize the optical performance of the corrector/reducer

the electronic parts (control box and hand controls + cables)

Right: OAG PRO with IMX174 sensor showing much less vignetting

The QHY 268C has zero amplifier glow no matter how long the exposure is

Length: 200mm

TESTAR 30mm f/4 MINI GUIDE SCOPE tripod extension The flange-sensor distance is oftenThe Testar 30mm Mini Guide Scope has a focal length of 120mm and a focal ratio of f 4. The objective is a fully multi coated achromatic doublet for a greater optical precision. The mini dovetail bar can be firmly mounted on any standard finder scope bracket so you do not require any extra piggy back dovetail bar on your telescope. The base of the finder scope includes a 1 4" female thread for a wider compatibility among telescopes. The focus is