Teleskopy.net

SklepSpołecznośćGaleriaMoje listy życzeńPoradniki sprzętowe
← Browse this category
Equipment buying guides

Guide scopes — a separate optical path

A small telescope and guide camera watch stars independently of the imaging telescope. They usually offer a wide, convenient field of guide stars.

This is practical for many short-focal-length setups. A rigid connection between both optical paths is essential.

Imaging camera · Guide camera · Separate guide scope · Mount and tracking corrections1234
  1. 1Imaging camera
  2. 2Guide camera
  3. 3Separate guide scope
  4. 4Mount and tracking corrections
Functional schematic, not to scale. Rays and component shapes are simplified; this is not a particular model’s optical prescription.

What is it good for?

Portable small-refractor systems and setups with easy guide-star selection.

Limitations and trade-offs

Differential flexure can elongate stars despite good guiding graphs, especially at long focal lengths or with primary-mirror movement.

Check before buying

  • Rigid rings and no play
  • Guide-camera focus and image scale
  • Mass and placement on the mount

Do not choose solely by an arbitrary focal-length ratio; pixel size and mechanics also matter.

Matching your setup

Start with mount setup and checking play. Enter the correct guide-scope or telescope focal length and camera pixel size. Calibrate according to the software and driver documentation; do not blindly copy another setup’s settings.

Judge the main camera’s images. Excellent graphs with elongated stars can indicate flexure, field rotation or an optical issue. Dithering shifts the frame between exposures and needs coordination between capture and guiding software.

Overly aggressive or frequent corrections may chase seeing. Match exposures and settings to mechanics and conditions. A more expensive guider cannot replace rigid mounting.

Compare with

Documentation and further reading
Browse this category →
Polityka prywatności i cookies ·