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Old 04-01-2015, 01:59 AM
raymo
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raymo is offline
 
Join Date: Sep 2011
Location: margaret river, western australia
Posts: 5,943
No one can help you without knowing what focal length scope you are using, and whether you are attempting prime focus work, or eyepiece
projection. At what stage are you using a 12.5 mm reticle EP? and why
the barlow? If your scope is around 1000mm F.L. with good P.A. you
should expect to get around 90-120 seconds without star trails.
raymo
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