[Imme (Jon)]

Originally Posted by Startrek

I agree with your idea no use wasting money but it’s a shame they did bring the R out earlier
Don’t get too caught up in guiding numbers as your focal length on the 130mm is only 910mm same as my 6” newt and I get round stars even at 1.80 arc sec error and 2 minute subs
As long as your around 1.00 arc sec error with no big variance in Dec you can easily push +5 minute subs with a focal length under 1.5 metres
Good luck with your big tune up !!
I might do a Rowan belt mod to my HEQ5 next year which should improve tracking and guiding substantially
All the best

Cheers Martin.