Here's a comparison between 7 subs and 23 subs. The images are not identically processed, but processed sufficiently as I always do to display on the blog. What this is showing nicely is that you really can push the processing more and there is far more detail showing through in the Crescent area itself.
The nebulosity around the Crescent is also looking much better with more data. This is as I would expect, but it's always interesting to show it with a side by side image.
I will continue to get more Ha data on this and then concentrate on the OIII. I am pleased as well to see that the calibration is finally working well as there's been some problems of late that have involved a software change. The calibration routine in the software I was using just wouldn't calibrate properly, no matter what I did.
Sara Wager is an astrophotographer with published articles and images to her name