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Thread: PHD Graph Autoguiding Optimization for Astrophotography Part 2

  1. #61
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2



    Quote Originally Posted by calypsob View Post
    Rob, if you sell the st80, you could easily afford to replace it with the orion guide scope. I recommend getting the version with the helical focuser as the original slide and lock version is a super pita. Guys, don't hesitate to post some more 500 second graphs, I see alot of 50,100,250, but for me 500 is what really speaks in terms of PEC, dither adjustments, and stiction issues. I have learned alot from this thread and hope others continue sharing as I will soon own a ZEQ25 to replace my cg5. It would be nice to be landing some dead flat phd graphs straight out of the box.
    I've got some 2 hour flat graphs ... :-> but I've only got 300-600 second skies!
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  2. #62
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2

    For example (I'm in the midst of shooting Ha on the Heart nebula).. here is a 500 second PHD graph and the PHD Lab analysis for nearly 2 hours...
    Attached Images Attached Images
    Last edited by Phil Leigh; 09-23-2013 at 10:50 PM.
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  3. #63
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2

    Quote Originally Posted by calypsob View Post
    Rob, if you sell the st80, you could easily afford to replace it with the orion guide scope. I recommend getting the version with the helical focuser as the original slide and lock version is a super pita. Guys, don't hesitate to post some more 500 second graphs, I see alot of 50,100,250, but for me 500 is what really speaks in terms of PEC, dither adjustments, and stiction issues. I have learned alot from this thread and hope others continue sharing as I will soon own a ZEQ25 to replace my cg5. It would be nice to be landing some dead flat phd graphs straight out of the box.
    Hi C'Bob,

    With your request in mind, I took some PHD screenshots last night when I was imaging M33. Only four minute subs, but they were all (22) keepers.

    I was also playing around with RA and DEC settings on the Z mount. Look at the RA and DEC Mx numbers, only 100 for each axis and the mount still guided well. The Z balanced mount continues to prove its worth no matter what settings I use in PHD.

    100 seconds:
    zeq_092313_Borg125sd.jpg
    500 seconds:
    zeq_0923133_500_125sd.jpg

    This is a pretty typical graph, but I'm usually able to tweak it to under .10 rms consistently by playing with RA aggression and RA and DEC Mx settings in PHD.

    Cheers and clear skies,

    Paul
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2

    Niceee. My cg5 never gets graphs like that, I am looking forwards to the upgrade.
    - Wes
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  5. #65
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2

    Just got through this thread start to finish- WOW a lot of great info!

    Essentially, what I gather is that in order to increase exposure time I need to reduce any potential wiggle points', polar align as precisely as possible; then run the mount's PEC routine (?)... ONLY after that should I even bother with any fine-tuning of PHD parameters(?)...

    I have never run the PEC routine on the mount (Just got it a couple months ago)... I got it and the autoguider all at the same time and just sort of 'dove in' lol... Very thankful to have read this (and thankful to all who posted!)- Had no idea PHD didn't correct for PE... I figured it'd track no matter what lol...
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2

    I have never run the PEC routine on the mount (Just got it a couple months ago)... I got it and the autoguider all at the same time and just sort of 'dove in' lol... Very thankful to have read this (and thankful to all who posted!)- Had no idea PHD didn't correct for PE... I figured it'd track no matter what lol...
    Actually, PHD will compensate, somewhat, for a mount with poor PE, and also for a poor polar alignment. As long as you are within 8 arc-seconds or so of the pole, and the mount is decent, PHD can do some magical stuff to keep your tracking where it belongs.

    That's why PHD sends signals to the mount, to correct errors in RA and DEC tracking, and some of the really bad PE spikes and periods that some mounts have.

    I've never used PEC, I've always been able to track well with round stars on all my iOptron mounts. The ZEQ25 has PEC, but it's not 'permanent', so I would have to run it every time I set up...not doing it..

    Cheers and have a bunch of fun playing with PHD and your mount setup,

    Regards...Paul
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2

    PEC tries to correct mount drive errors before they happen based on analysis of historical errors, guiding tries to correct errors caused by anything after they have happened.
    I find my best results come from applying PEC combined with ASCOM pulse guiding. If i had to run PEC training every time then like Paul I wouldn't bother... Life is too short.
    This would sway me to either a mount with onboard permanent PEC or one that can be controlled via EQASCOM.
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    Default Re: PHD Graph Autoguiding Optimization for Astrophotography Part 2

    All things considered, as PHD is 'reactive' vs. proactive- I figure applying the PEC routine at least once may help 'a bit'... and I usually do my imaging from the same location (if that matters)... Once I get out from under school, the clouds & a couple other things I have going on; I definitely plan to spend some time seeing how long I can expose the chip
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