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G11GT Guiding performance

 

I was wondering how the new G11GT does with guiding? I haven't seen too much on this mount when it comes to auto guiding.?
 

It does really well. On good nights i can pretty easily guide within 0.5", typical nights for me here in LA are 1" with occasional excursions into 2". that's without PEC

there is a 42 period error we're still trying to track down to improve things

I think in good skies, it could easily to 0.5" all the time


Brian
 

Hi Brian,

What is your payload weight and what are you using to autoguide with, camera and scope or OAG? Thanks.

Chip
 

right now i' m on a skywatcher 120ED Esprit with ASI1600mm-c

i'm guiding from a separate guidescope Tak Sky90 (because I have it) with asi 1600mm

I'd say the whole thing is around maybe 35lb? i have an intel-nuc and powerpole setup on the top of the scope as well.?

I upgraded to the G11GT because of the 12" rc i have, but i think i've come to the realization that the skies i have here in my driveway are not up to that kind of resolution

B
 

Hi Brian,

That is a very nice imaging setup. I really like the Esprit line apo features for imaging, excellent glass, combined with ASI1600mm you have a perfect high resolution pixel pitch match for the Esprit 120mm f/7 OTA @ f/7 or f/5.6.?And a Tak Sky-90 for an autoguider scope - wow.?

I think a guided PE in the 0.5"-0.4" RMS range must be typical with a Losmandy mount and autoguiders with 3.7-3.8um photosites. My own G11G has shown about the same PE when guided using a QHY5L-II mono which has a 3.75um photosites. The interesting thing I found is that the guide scope focal length seems to make no difference in the PE numbers! I use a Stellarvue 50mm f/4 guide scope and I have also used a Meade 10" f/6.3 SCT OTA with the same autoguider camera at prime focus, same PE! This is a mystery to me as to why the fl made no difference. I suppose it could be the air that limits autoguiding.

Chip

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