Previous version of both drivers returned image with coordinate
system origin (pixel at coordinate [0, 0]) in the bottom-left corner.
This is the standard, defined by FITS format. But majority of software
packages obviously suppose image origin in the upper-left corner, so
images read from the driver appeared vertically mirrored. Both drivers
were modified to return images with coordinate [0, 0] in the
Because G2, G3 and G4 series of CCD cameras are able to control
internal or external filter wheel, ASCOM driver for these cameras also
exports filter wheel control interfaces. However, invoking of
functions from camera and filter wheel interfaces in overlapped manner
(e.g. from two execution threads at once) could cause synchronization
problems. This is why the filter wheel interface implementation was
reworked not to interfere with commands sent to main camera interface.
One consequence is changed filter wheel behavior—requested filter is not moved to position immediately
when the particular command is issued, but only before light exposure.
This change affects only the command timing, the filters used for
exposures are always the correct ones.
Drivers can be download from Download page of this site.