G11 guiding help needed - Page 5

Paul Haese · #81 13-04-2010, 06:11 PM

Looks pretty good to me. Mind you I would like to see a larger version Pete.

Exfso (Peter) · #82 13-04-2010, 07:55 PM

Yeah unfortunately I cant post a larger one here.

wasyoungonce (Brendan) · #83 09-07-2010, 02:30 PM

Just jumping on this thread for advice guiding advice, G11/PHD.

My G11 is really behaving & guiding nicely in RA but DEC guiding starts off with an awful error~14 to 11 arc sec's. I noticed some slight elongation in my stars and I'm attributing this to my DEC.

I noticed that the error is large at the start of guiding but smooths down quickly to acceptable level. I only wait a few seconds between PHD "starts guiding" before starting exposures...maybe 5 seconds at best. Should I wait longer?

Anyway any ideas on cause of the DEC issue?

All graphs on 05/06 Jul and I changed from 3.0s guiding iterations to 3.5 sec's on the 06 jul. RA graphs are corrected for declination angle.

multiweb (Marc) · #84 09-07-2010, 03:00 PM

I usually bump the mount to dither then give it 20s minimum to settle down. The way I look at it is what's 20s more in your imaging session when you do 10min subs or more anyway.

wasyoungonce (Brendan) · #85 09-07-2010, 03:14 PM

Thanks Mark...This is what I'm thinking...I'm not allowing guiding to settle before starting subs?

It appears DEC does settle by itself...just takes awhile.

I like the idea of dithering subs...on my to try list.

multiweb (Marc) · #86 09-07-2010, 03:35 PM

Quote:

Originally Posted by wasyoungonce

Thanks Mark...This is what I'm thinking...I'm not allowing guiding to settle before starting subs?

It appears DEC does settle by itself...just takes awhile.

I like the idea of dithering subs...on my to try list.

When I first calibrate PHD and it starts guiding my DEC usually goes its merry way. I then go for a cuppa come back when the backlash is gone and the worm is loaded and guiding then I check the direction of the drift, sets the guide against it and set the max dec duration to 500ms and that's it. When Neb downloads the pic it pauses guiding so DEC will go one way or the other. When PHD's back it will pick up the DEC back then start guiding again within those 20s and I get another sub started. Works quite well. Don't loose too much sleep over DEC.