Posted here too as to why I might want more than 9999 frames in a sequence!!!
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First section of my mosaic from last night - shot as luminance / monochrome only, and each frame is static.
Cropped the edges, so about 800 frames worth from the first 999 frames, 1.0 seconds per frame (Horizon CMOS sensor + USB3 made this possible), high gain (30).
The centreline of the equatorial grid is at about +5.5°.
The two brighter vertical stars to the right are 63 and 66 Orion, and the brightest star towards the lower-left is 8 / Epsilon Monoceros A.
Despite the short exposure time, stars in the original are visible down into magnitude 15. I have had to scale this version down to 16.5% to make it under the 600KB maximum.
I have another 9000 frames to process !!!