Hi Raymo,
Apologies I should have been more specific
When I have taken an image on my 600D DSLR at prime focus on live view and review the image I magnify the image from normal to x5 and then x10 to check star trailing
The longest exposure I have achieved through the Synscan PA procedure when stars are just starting to elongate was 120sec ( Omega Centauri) but this was rare as the majority of exposures are around the 60 sec to 90 sec mark before the commencement of startrailing
Martin
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