This is a 20-frame mosaic. Each frame contains 18 3-minnute exposures at ISO 800 (54 minutes total exposure for each). The images were taken in 9 nights between 2014/11/19 and 2015/01/24.
The original mosaic has 400 Mega pixels, which is too large for the internet. Here I uploaded a small versions for people to click into and see the details.
To see the full details in the 400MP original image, please check the GigaPan page:
http://www.gigapan.com/gigapans/169804Enjoy it.
Bonus tracks:
In order to correctly model the sky background and remove the background gradients, I took various wide-field images when the primary imaging scope was making exposures of the mosaic panels. The wide-field images themselves are also mosaics. In the wide-field ones, I first used PixInsight's ABE function to remove the large-scale gradients. Then I forced each of the narrow-field images to have the same background gradients as the gradient-removed wide-field images. This way, the individual mosaic panels can have consistent background brightness and gradients.
Rev B is a mosaic image made with Nikon AIS ED 180mm/F2.8 (permanently lost)
Rev C is a mosaic image made with Nikon AFS ED 80mm/F1.8.
Rev E is a mosaic image made with Sigma 50mm/F1.4 Art.
The camera is a modified Nikon D800 in all cases.
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