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Unfortunately, no - I self-taught and learned some valuable lessons along the way - I have written some of it here before, but I may do so again one day. Getting 20 minute subs with a cheap guider would seem to indicate something is spot on each time.
Every trget last night was dead centre in the field of view - well, what was visible anyway (I always take 1 x test shot at ISO 2000/30 secs to check any deep targets)
1 pointer though is I ALWAYS use both an illuminated reticle eyepiece and finderscope, and every target dead-centred. I use the highest power illuminated eyepiece possible - narrows that zero down even finer.
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