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Thread: PHD Frustrations

  1. #41
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    Default Re: PHD Frustrations



    Quote Originally Posted by calypsob View Post
    Well that is fantastic, it is good to hear especially for you more experienced astrophotographers. After imaging last night I realized the HUGE difference between imaging with a fast f4 newtonian and my slower f7 apo, So you guys are exactly right, I am finally being able to focus on something else besides guide settings, composition, exposure, and processing, my favorite! Also for you CG5 users, this mount is not responsive to fine pulses in the DEC axis under 250 dec mx, I'm not sure why. The most important thing to remember when guiding on this mount with phd is to let the OTA be slightly off balance towards the weight end and and to turn up the DEC sensitivity to 99 in the nexstar controller, and then turn the "dec mx" all the way up to 2000 in the phd graph menu while autoguiding. Also some people recommend changing the algorithm to lowpass in the advanced settings however I found this to work against me in the southeastern united states so leave on resist switching. Remember to always ask questions and put in your hours with PHD! I am 99 % sure I have the bugs worked out now but we shall see what the future brings. Clear skies to all!
    Calypsob,
    In response to your post about the Dec axis... the failure to move in under 250 ms may be due to backlash in the gears. I ripped my mount apart, gave it a home version of a hypertune, and tweaked the spacing of the worm gears on both axis before trying PHD out. the removal of the tree sap they use for grease may have helped my mount perform better in the cold. This grease was known for sticking something awful. I replaced it with white lithium and have had great results so far...
    Good luck imaging!

    Jim
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  2. #42
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    Default Re: PHD Frustrations

    Quote Originally Posted by KeithBC View Post
    I think that what constitutes a "good" graph is highly equipment-dependent. My system (162mm FL guide scope with QHY5 guide cam on an 800mm FL Newt) needs a much flatter graph than that, and an RMS of 0.10 or less. You have to get to know your own gear and how it behaves. That graph may well be excellent for your gear, but if I saw that graph on my setup, I would abort the run and try to see what was wrong with it.
    That is interesting keith, what does your graph usually look like? Thanks again for the input.

  3. #43
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    Default Re: PHD Frustrations

    Quote Originally Posted by calypsob View Post
    That is interesting keith, what does your graph usually look like? Thanks again for the input.
    I don't have any saved examples, so I will have to describe it.

    Both my RA and Dec stay closer to the zero line. The peaks are shorter in time than yours, with maximum amplitude for occasional peaks on both roughly equal to the max amplitude of your RA graph.

    I would see that ramp-up tendency of the Dec as a problem on my setup. It indicates that something is giving a steady push on the declination. It could be an alignment issue or a balance issue. Less often, a wind issue.

    Like I say, though, my results seem atypical. In the sticky thread on PHD graphs, most posts have graphs more like yours. But if I let mine do that, my images would be nasty. It is a matter of learning to interpret what your equipment is trying to tell you.
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  4. #44
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    Default Re: PHD Frustrations

    Quote Originally Posted by KeithBC View Post
    I don't have any saved examples, so I will have to describe it.

    Both my RA and Dec stay closer to the zero line. The peaks are shorter in time than yours, with maximum amplitude for occasional peaks on both roughly equal to the max amplitude of your RA graph.

    I would see that ramp-up tendency of the Dec as a problem on my setup. It indicates that something is giving a steady push on the declination. It could be an alignment issue or a balance issue. Less often, a wind issue.

    Like I say, though, my results seem atypical. In the sticky thread on PHD graphs, most posts have graphs more like yours. But if I let mine do that, my images would be nasty. It is a matter of learning to interpret what your equipment is trying to tell you.
    thanks keith, I hear that those 8 inch newtonians have a large mass so I would imagine it is much more sensitive than my 80mm apo but that is good to know because I have considered purchasing an 8" astrotech newtonian in the near future.

  5. #45
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    Default Re: PHD Frustrations

    Quote Originally Posted by jimminCT View Post
    Calypsob,
    In response to your post about the Dec axis... the failure to move in under 250 ms may be due to backlash in the gears. I ripped my mount apart, gave it a home version of a hypertune, and tweaked the spacing of the worm gears on both axis before trying PHD out. the removal of the tree sap they use for grease may have helped my mount perform better in the cold. This grease was known for sticking something awful. I replaced it with white lithium and have had great results so far...
    Good luck imaging!

    Jim
    Thanks for the tip Jim, I think I may do some hypertuning in the future but for now I have 3 more months warranty covering this mount so I'm playing it safe. It is a newer CG5 so I think that they resolved the grease issue but it is a mass produced factory mount so I'm sure it has some flaws which could be adjusted. If anything I would really like to order some ceramic bearings and replace the plastic contact points with teflon.
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    Default Re: PHD Frustrations

    You graph looks much better, the proof will be in your stars. If your stars are round then you know you did good! The key now is if you are able to repeat these results each and every time.

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