Starlight Xpress SXV-M8C - Manual (Page 28)

Handbook for the SXV-M8C Issue 1 Jan 2005
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‘bias offset’ of the camera in each image and this can produce an error in the final
correction. As we are mainly interested in the bias, any very short exposure dark
frame will give a good result. The dark subtracted images should then be averaged
together before use.
After the above procedures have been executed, the flat field will be ready for use.
Load up your image for processing, subtract the dark frame and then select ‘Apply
flat field’ in the ‘Merge’ menu. The result should be an image with very few signs of
the original artefacts and you can then process it in the normal way.
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The SXV-M8C accessory ports
The SXV-M8C is provided with two ports for use with accessories. The Autoguider
output port is a 6 way RJ11 socket, which is compatible with the standard autoguider
input of most telescope mounts. It provides 4 active-low opto-isolator outputs and a
common return line, capable of sinking a minimum of 5mA per output. This socket
may be used for telescope control if the SXV-M8C is employed as an autoguider, but
is primarily intended to be the control output for the optional add-on autoguider
camera head, available for use with the SXV-M8C.