Hi.
I have been taking unguided subs of 100 seconds recently.
I have had a throw out rate of less than 50%, ie: over half the pics have round stars and are keepers.
I'm fairly happy but would like to increase the good sub strike rate and I have a few questions regarding this.
- If the good subs have nice round stars, can I assume polar alignment isn't contributing to the bad subs? I figure bad PA would ruin all the subs.
- Does that then mean my movement errors are probably caused by periodic error / sloppy focuser / wind etc etc, rather than polar alignment?
- What have you folks found to be common causes of bad unguided subs and where should I be looking to eliminate movement?
I'd like to keep the exposure time as long as I can and keep tweaking for better tracking rather than shorten the subs.
Mount is AZ-EQ6 GT
612mm focal length refractor
Canon 600D
Thanks.