Focusing is much easier now with a self-made Hartmann mask (with 3 triangles).See the result of better collimation and focusing. With only 20min I have the same result as previous 60min exposures.
Also the "coma" abberation is much less compared with the previous exposures I took from M57. It was a lot of work, but the re-adjusting of the whole telescope paid off.
Very faint, at 4-o-clock position from the nebula, 2-3 rings further is very faintly visible IC1296, a barred spiral galaxy of 15.3 magnitude, 300 million lightyears away from us.
