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Hi Matty
I think that Brendan was maybe trying to explain that an RDF or Telrad is only an x1 magnification device and trying to centre an object on a CCD chip can be really hit and miss using these unity magnification devices.
Using a 9x50 finder scope gives you a magnification of x9, so makes placing the object on the ccd chips at least 9x more accurate.
Cheers
Dennis
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