Quick comparison FYI of Seestar's mosaic mode v's its native FOV.
1st pic: NGC2070 - maximum mosaic size
2nd pic: first mosaic segment FOV
Note: mosaic pic (processed in PI) is the stacked image straight out of the Seestar...haven't found a way to easily assemble all the individual saved Fits files yet.
When I (naively) ran all 1032x10sec subs through WBPP, it rejected all but 372 files which became the 2nd pic.
