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Would locking on to a bad pixel in guiding show the limits of the mount and leaving bad seeing out of it? Would that work? Would it show tracking errors in the mount? Glen

There are a few inaccuracies here regarding (at least) the Gemini II; 1. it's tempting to use a poor seeing night for PEC, but generally you want a good night to do PEC. it's better to use full moon

Hi Arun, A bump won't ruin the synch. A rotation of the worm, without Gemini knowing about it, would ruin the synch. And only the RA matters for this PE and PEC work. But really, just do the PE

Hi All, I am also interested in sorting out my PE tonight. (new G11G w/Gemini-2) But I have more questions than answers... (I will be using PEMpro tonight.) I have tried it in the past, but have not

Hi Michael, Thanks for the very detailed write up. There is one thing? that your post clarified, which is how the PEC curve is synched to the current worm position. My follow up question is this: if

Hi Arun, PE evaluation is probably the most critical evaluation of a mount. It is like a "startest" for optical systems. It's where the rubber hits the road. It can be done in one evening...even

Thanks all...

Hi Arun i posted pretty extensively about my experiences with unguided imaging: /g/Losmandy_users/message/65935 /g/Losmandy_users/topic/70914502#64790 Although I

Has anyone tried PEMPro and found implementing a PE correction to make a meaningful difference in tracking? It seems like it should, but it also seems like PHD2 should be able to correct a long period

PemPro is pretty good at removing a consistent drift that may be caused by a slow shifting of the mirror, although getting close to the meridian can mess with the "slow and consistent" part

As far as I know, Ray doesn't, although I recall that he wrote a simulator for Gemini for his own testing :) René and I provided Ray with Gemini-specific information for PemPro. But yes, I agree,

Yes that's a good point, mirror flop can create issues, so you have to be careful with that. I record PE data around the meridian/celestial equator intersection and have pier side west, hopefully that

I'll add that it might not be best to acquire the data using a SCT especially for a long duration due to mirror shift. Keith

Thanks Brian.

Yes - in fact it has expanded support specifically for Losmandy Gemini. I'm pretty sure Ray Graylak (PEMPro author) owns a G11. It's pretty much the best (and only) game in town for periodic error

Hi Brian, I've been considering purchasing PEMPro as well to analyze my PE. Does PEMPro have a way to load the PE curve into the Gemini ASCOM driver or into the Mount firmware itself? I guess I am

Hi Jim the best way is to use PEMPro to gather as many cycles as you can (i'd say 5-15 cycles) and use the PEMPro log viewer in amplitude priority. that gives the most accurate reading, including

As the title says.? What's the best way to determine P.E.?

Well, what I've been experimenting with basically starts East of the meridian, and I just image until the scope bangs the mount. 8^0 (Not really. But it swings from over there, to way over there.) I'm

Well, that's what the guy told me 5 years ago. I was very disappointed it didn't work. -- SonnyE Sonny's Youtube Channel ( https://www.youtube.com/results?search_query=sonny+edmonds ) (I suggest