Starlight Xpress SXV-M7C - Manual (Page 10)

Handbook for SXV-M7C Issue 1 June 2004
10
At this point, you will have a working knowledge of how to take and process an SXV-
M7C image. It is time to move on to astronomical imaging, which has its own,
unique, set of problems!
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Astronomical Imaging with the SXV-M7C
1) Getting the image onto the CCD:
It is fairly easy to find the correct focus setting for the camera when using a standard
SLR lens, but quite a different matter when the MX7 is attached to a telescope! The
problem is that most telescopes have a large range of focus adjustment and the CCD
needs to be quite close to the correct position before you can discern details well
enough to optimise the focus setting. An additional complication is the need to add
various accessories between the camera and telescope in order that the image scale is
suitable for the subject being imaged and (sometimes) to include a ‘flip mirror’ finder
unit for visual object location.
A simple, but invaluable device, is the ‘par-focal eyepiece’. This is an eyepiece in
which the field stop is located at the same distance from the barrel end, as the CCD is
from the camera barrel end.