My 2c worth......
I was using a guidescope which was working OK but decided to follow the crowd because I read OAG was Better (which I'm sure it is for some). Purchased and swapped out a few extensions and had perfect focus......found good guide stars easily every time.......changed all my PHD settings to suit......calibrated no worries.......but guiding was absolute crap! Struggled with it for a couple months, pulled my mount apart thinking it was issues with that, tried everything. I then put the guidescope back on and was immediately able to do 10 minute subs with 1 pixel variations....almost perfect.
OAG may be great for some.....but it lost me money and a couple months imaging......
Guess it goes back to the old adage - If it aint broke don't fix it.
PS - get a slightly used OAG for sale if you're interested????
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