Well Good Grief Frank,
I realize that you are the metaguide guy with an agenda and your arguments with Gaston are well known on CN, so why not keep them there? That’s why I bought the IF ONAG and not your system. If you have to correct every second, then there is a fundamental problem with the system mount, flexure, PA, backlash, PEC, ect. The longer your guide intervals and hopefully, the smaller your corrections, the better your system. A longer guide interval also allows you to capture dimmer stars and not chase the seeing.
I am able to guide with sub 1" using the IF ONAG system and 15 sec guide intervals with PHD2. No arguing that point Frank as the prove is there. Maybe I’m old school and to the OP I’ve not used a Celestron scope and whatever mount, but Rod Wodowski stated the following:
"Any mount that needs guide intervals of 3 seconds or less is one that I would call problematic. It’s very convenient to be able to use guide intervals of 7 - 10 seconds because it allows you to use dimmer guide stars. A mount that consistently delivers these longer guide intervals without causing guiding errors is an excellent mount, especially if it does so at long focal lengths (2000mm and longer).
So I’ll stand by my statements Frank, though I may be old school and perhaps you have reinvented the wheel with regard to autoguiding. If you have, congrats.
My apologies to the OP as I did not intend this to turn into an advertisement/arguement. You do have one of the best guide cameras out there. If you need further assistance with the celestron and guiding, PM me as I know someone who has used that scope with PHD2 and been very successful