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That's a really great shot, Dale. And congrats on obtaining an APOD. I've yet to get one of those.
I did a similar mosaic in H-alpha. The view it encompasses is slightly larger. I had intentions of making it full color. But even in H-alpha alone, the amount of data became fairly overwhelming for my little PC.
This is an 8 frame mosaic and required 30 hours of exposure time, over 9 separate nights. It required probably another 40-50 hours of computer time to calibrate, stack, process and assemble the image. The final image is over 60 megapixels.
I'd amazes me to see how large some of these structures are. If our eyes were as sensitive as our cameras, the sky would surely look different.
Click on the image to go to my photo page. If you mouse-over the image, you can choose original (or one of the larger formats), and see the many double stars and other very fine details. Just be patient for it to load.