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Graham,
There are a few places you have to specify the Image Scale and I always set all of them 'just in case'.
1. Menu Bar - Telescope/ Tpoint Add On/ Calibration Run/ Automated Calibration/ Setup
Click Take & Image Link photo then Set Image Scale and PA correctly. Click Source extraction setup. The defaults are usually OK for everything except Set Size of pixel(arc sec).
2. Menu Bar - Tools/ Image Link
There are 2 places under the Search Tab,- Known and Unknown image scale.
Setup Tab. Scale tolerance and Search Radius then click the Setup button. This is another Source extraction setup similar to that in (1) above.
If you use the AllSky option there are some more places; - Unknown image scale wants a min/max search range and Known image scale wants the actual scale plus a tolerance.
These have all been previously mentioned but having them all together may help!
If you have done all these and still get the infamous 655, it may be your pointing is too far away from where the Slew wants it to be.
Charles
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