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Thread: PHD graphs I'll show you mine if...

  1. #101
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    Ken looks amazing after the PEC correction. To be honest lately I have had similar DEC guiding issues, but I am not sure if it is my polar alignment (or lack of it as I don't really do much of it) or a DEC axis issue with the mount.

    The worst thing is sometimes I have a graph that looks like I have a paramount (buttery smooth near the 0 line) and other times seems like I have a EQ2 with a 32" telescope mounted on it in 50km/h winds!

    I have finally gotten my Pempro to work with my webcam, and I will be doing a very thorough PEC of my mount (with motivation from your success) along with polar alignment / drift alignment. After that hopefully I can get nice guiding and great PHD graphs in all directions.

    Here's to plenty of imaging soon and clear skies (they are blue here without even a wisp of clouds to be seen so I may try this tonight!!)

    best wishes and looking forward to everyone's inputs and success.
    Gus
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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  3. #102
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    thanks for the good will wishes Gus
    I know there is still declination issues with this mount and after my experience with Celestron support I decide to buy whatever replacement parts are available and repair it myself.
    Ken

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    Ken, in your earlier post with the graphs you mentioned clearing the PEC on the mount that was a carry over from before it was repaired; did you reteach the PEC or just leave it alone when you did the run shown in the second graph?

    All things considered the image of M13 is pretty good, I can't wait to see what it's like once you get the mount squared away
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    Quote Originally Posted by kbeverage View Post
    Ken, in your earlier post with the graphs you mentioned clearing the PEC on the mount that was a carry over from before it was repaired; did you reteach the PEC or just leave it alone when you did the run shown in the second graph?

    All things considered the image of M13 is pretty good, I can't wait to see what it's like once you get the mount squared away
    The first graph was with the PEC files from before the mount was repaired.
    I noticed my settings were retained in the hand controller when I first fired up the mount but was so involved in my Polar alignment never bothered to retrain the PEC.
    After taking 5X6min subs of M13 I fired up PECtools and noticed the index had already been found from before but the seeing was horrible so I did a calibrate mount command which makes the PEC files invalid.
    this just tells the mount to remember the index and irregularities in the slew to and away from the index which helps in tracking.
    Next outing I will do batch training for PEC.
    Ken

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  9. #105
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    Ken,

    An interesting story and images. Your 500 cycle graph really showed a big picture of how your mount was working. I think I'll try one of that size to see what's going on.

    We had some really nice weather this week and I was lucky enough to spend it in the hospital. Went in for laprascopic outpatient surgery and ended up spending the whole week in the hospital and several more weeks of recovery to look forward to at home.

    M13 under horrible seeing is pretty decent; I'm constantly amazed at what digital cameras can see. I have had a couple of sessions where I was able to image but quit because guiding didn't work well only to notice later that the sky was completely cloud covered.

    Dave
    LX200ACF 10" in observatory, TeleVue Pronto, Astro Tech AT65EDQ, ZWO ASI120MC, SBIG 8300M, SBIG FW5 filter wheel, Baader LRGB and 7nm Ha filter.
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    Quote Originally Posted by Skyhawk727 View Post
    Ken,

    An interesting story and images. Your 500 cycle graph really showed a big picture of how your mount was working. I think I'll try one of that size to see what's going on.

    We had some really nice weather this week and I was lucky enough to spend it in the hospital. Went in for laprascopic outpatient surgery and ended up spending the whole week in the hospital and several more weeks of recovery to look forward to at home.

    M13 under horrible seeing is pretty decent; I'm constantly amazed at what digital cameras can see. I have had a couple of sessions where I was able to image but quit because guiding didn't work well only to notice later that the sky was completely cloud covered.

    Dave
    Sorry to hear you had to spend any time in a hospital let a lone an extended stay.
    Hope everythings OK
    I hate those places myself...
    The mount was pretty sloppy before I sent it out but it still has a problem in declination that is unacceptable being that the stars in my unguided images are rounder than the guided
    I'll nail it down later
    Hopefully we all have clear skies in our very near future.
    Ken

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    Default decent graph, poor photo

    Hi,

    Between bad weather and recovery from surgery, I have not been able to spend more than a couple of hours in the observatory since last fall.

    The attached M101-300 second exposure was made through my 10" LX200 at f10. The camera is an SBIG ST8300M (only the 2nd time I've used it). Guiding was a piggybacked TeleVue Pronto with a Meade DSI III pro and PHD.

    M101 being dim could have / should have been centered better but decending dew limited me to a single 5 minute exposure. Guiding was in 2 second increments. I'll do better next time. The scope camera combination yields a field approximately 18 X 25 arcminutes.

    The graph actually looks pretty good, but it is my experience that high declination angles make better graphs than real results. If you magnify the stars in the M101 image they are nowhere near round, so I need to keep working. Balance may be a problem as the setup is new and needs tweaking.

    On the other hand, 2500mm focal length yields quite a bit of magnification and more practice should help.

    Does anybody think adding a barlow to the guide scope might help.

    Let me know your thoughts... thanks.

    Dave
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    Dave wish you a speedy recovery looking great!

    In terms of my progress, I will be doing a Pempro analysis, and a polar / drift alignment using CCD. Hopefully I can figure out my error, and how good I can get an idea of my mounts limits ie time limits in guiding, star shape etc.

    Due to the size of this thread (over 100 posts) we may have to continue it in PHD Graph Autoguiding Optimization for Astrophotography Part 2
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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