OCAL 4 ELECTRONIC COLLIMATOR Spectroheliograph Horsehead Nebula by Wolfgang Promper

Horsehead Nebula by Wolfgang Promper using Moravian C3-61000 and 600mm RC at f/4

Recommended sensor distance to the rear adapters is between 40 - 70mm

25" T2 Prism Diagonal is a high quality prism diagonal for observation with 1

Go2Nova 8410 Hand Controller

OCAL 4 ELECTRONIC COLLIMATOR Spectroheliograph Horsehead Nebula by Wolfgang PromperThe OCAL 4 Electronic Collimator is a revolutionary new device for collimating reflecting telescopes with the aid of powerful and easy to use software. With the aid of precise calibration guides, the OCAL makes the daunting task of collimation a breeze. The new 4 version offers some enhancements of the predecessor while retaining its the core stability. With an aperture slightly reduced, the 4. 0 version brings several significant advantages. Superior