I find sketching globular clusters very difficult. They are complex objects and the result with pencil on white paper was rarely appealing to me. Afterwards, I needed a lot of work to make the result acceptable (I like sketching at the eyepiece, but not the postproduction). I have been experimenting with black paper for a while (see this topic). A combination of white pastel (for the background glow) and a white chalk pencil (for the stars) turned out to be an ideal combination. Just like my moon sketches, you get a field sketch that is as good as finished. Except for digitizing, cleaning some pastel swipe or making a bright star round if needed. I didn't touched the other stars (so they are not all round).
How did I proceed? The beginning was the most difficult part: the background glow with pastel. The lack of (red) light turned out to be a problem. As soon as you start to wipe (with your finger, ear stick or tortillon), you no longer see what you are doing. With moon sketches you can use a lot of (white) light, with deep sky you can't. After a few sketches, I found a solution. If you press the red light completely against the paper and shine parallel to the sheet, you can see weak contrasts. But still it isn't ideal. Sometimes it took a long time before I was satisfied. The stars and granulation were more easy. You can sharpen the chalk pencil well and the tip lasts a long time.
During a 2 week holiday in France I enjoyed a dark sky. All objects were also 5 ° higher in the sky (than my hometown more north). I used the same magnification for all sketches: x240. The field of view of the sketches is more or less the same. It was a little to much for two large globular clusters (M22 and M55). At x240 you start to look through the globular. Working without a sketch circle is liberating. You don't feel the urge to put all the environmental stars on paper. That is why I deliberately chose a square presentation. I had bought an A5 sketchbook. Works fine, but there was hardly any room to write comments. In the future I will use A4.
I sketch in total 17 globular clusters, where I preferred the low specimens (which cannot be seen from home). I thought a lot about how I would display them. I hope you don't mind a collage. Click on the sketch for more detail.
Edited by Jef De Wit, 03 August 2020 - 12:00 PM.