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Doug
Askew took these images using his 15" Obsession on an Equatorial
Platform. An HX9 CCD camera was used at prime focus to take multiple
short exposures (typically 10-15 seconds). These exposures were
then stacked to get the final image. Note that all exposures were
UNGUIDED. While Doug used a Dual-axis Platform for these images,
similar results can be achieved with a Compact or Single-axis Platform
using the same technique -- stacking a series of short (10-30 second)
unguided exposures." The images of M81 and M82 both were 15 15second
exposures stacked, using the same equipment as was used for the
others.
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