Astro-Physics 305 mm F3.8 Riccardi Honders Astrograph

SBIG STX16803, AO-X, 10Hz self guide, Paramount PME

Single 600 second exposure. 65mm Baader Clear filter.

Dark subtracted, No-flat field.

MaxIm DDP stretch only. 100% res. Approx 1/3 frame centre crop

Check your monitor, can you see all 26 grey scales below?