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Good evening chaps (and chappettes), the clouds have rolled in so I thought i'd use my time wisely.  I'm currently running a 200PDS on a G11, Gemini 1L4, with C2A as my planetarium and PHD2 as it's awesome.  All is well, my alignment is great, and i manage good 5min subs from my dslr. 10mins works too if I bother to drift align (mod 1100d).

However, I have an issue.  I can't get my head around the meridian flip.  If I nip outside at an opportune time and ask C2A to do it for me, then it asks for all sorts of parameters that i don't know.  Do I just make them up?  I've upped the slew speed to 1500 in the losmandy driver, as i've put hi torque motors on my G11 and it's great. Still Gem1, L4, but since i use a PC i don't miss Gem2.  Do I put similar numbers into C2A, and if so, what is the centering and guide speed??

I've also bought SGP, but I am reticent to waste a valuable clear night playing with it, when I could be imaging...  I'm sure we've all been in this situation! Same reason I haven't put the 120ED with moonlite motor focuser on the mount yet.  Actually, that isn't true... That one isn't on there as the wife might see it and realise I've been shopping again! Please someone tell me SGP is worth learning.  Currently it looks alien to me....

But really... Do i have to bite the bullet and embrace SGP, and if so, can someone point me to a decent newbie tutorial? or am I missing something mega obvious in C2A...

thanks, as ever.


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Yes you do need to embrace SGP. I use it all the time.

It is so simple to setup. And once you have a sequence set. You can walk away.

I am using the same mount and Gemini software as you. But I have never had to do a Meridian flip. I prefer to select a target that is either side of the meridian, and allow plenty of imaging time.

I can regularly shoot between 900 and 1200 second subs with my telescopes. I use Polar Align Correction to get my G11 bang on.

Here are some tutorials that will help you.




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thanks Paul - I figured I'd have to hit it eventually - I'll have a read through the tutorials you've kindly provided, and dedicate a night to sorting it once and for all.  Amazing you get subs so long! I'll have a go at aligning properly, and see how I do.  I suspect my image length is more limited by lovely Birmingham to my North, and it's delightful airport...


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Hi Jim,

My G11 is on a  pier, and is left outside undercover. What I do to accurately align the mount is to use  "Polar Axis Correction"  after I have done several alignments.

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For 2 years I also used SGP with my G11/Gemini1_L4, it was a good combination and together with a 5" refractor I could get 20min subs easily - autoguided of course. With the rat's nest of cables I ran with back then I was always wary of doing an unattended meridian flip, so I would also go outside and manually flip the scope carefully guiding the cables so they didn't snag :) - then go back to the warm  room and carry on. That's not a recommendation for a good way to work! Since then I've changed mounts and also made sure the cable loom can never snag during a flip, so flips are done remotely now. Do you use an off-axis guider? I imagine flexure might be a problem using a Newt.


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I have a G11 with Gemini 2 and i let it do a meridian flip all by itself using Prism V10, it is a sophisticated software with a lot of brains to manage everything automatically and handles errors brilliantly as well. Talking about SGP videos, Chris Woodhouse ( he lurks around here somewhere ) has made some excellent videos and i encourage to visit the page below, he explains in detail how to set it up and why.


Clear skies

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