Description

This image is a mosaic of two frames obtained with a Canon 7D Mark II 20-megapixel digital camera and 300 mm f/2.8 L IS II lens at f/2.8 and ISO 1600. No dark frame subtraction, no flat fields. Tracking

with an Astrotrac and no guiding. The left side had 70 minutes of exposure and the right side 27.5

minutes (plus shorter exposure for the core of M42 in a high dynamic range image). These images record unprecedented faint detail for a DSLR and such short exposures, illustrating the amazing low light capability of the 7D Mark II camera.

The two individual frames with more details are here:

Horsehead

and

M42

Roger