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Thread: PHD Graph Autoguiding Optimization for Astrophotography Part 2

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    Default PHD Graph Autoguiding Optimization for Astrophotography Part 2



    PHD Graph Autoguiding Optimization for Astrophotography Part 2
    continued from part 1 here:

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

    Post your PHD graph, optimization procedure and more here! All about guiding and optimization using PHD
    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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    Dave,

    Sorry to hear about your hospital stay! Hope your recovery is going well.

    Take a minute to read through this post Stark Labs PHD guiding software helpers It describes what each of the PHD settings do. Your getting close!
    Gordon
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    Currently out doing some testings. Trying to fix my collimation but seeing what I can do w/ some mild winds. But the mount doesn't like wind at all. I can't get past 8min and even those will have some throw aways. Sticking to 5min subs for now so I can have near 100% keepers.


    PHD M101 5-26-11 by jsigone, on Flickr
    ---Jeff---
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    here's a single 5min shot @ ISO 1600, PHD chart is about the same near the horizon as was zenith going for M101. Found out PHD doesn't like 2 stars in the green sq even if one is on the lines. The Dec adjustment was staying at +10 across the board. Does the same if the star is too dim so I'll have to adjust the exp .5sec longer.

    I finally got it collimated better, but one side of the chip is getting ovals, I'll have to see if the camera isn't flush to the focuser or thinking when I modded the camera one side was torqued to much causing the CCD to tilt. I'm really digging the FL and resolution of this scope oppose to my doublet refractor w/ FF.

    M8 Lagoon single frame collimation test by jsigone, on Flickr
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    That looks awesome Jeff, I was hoping to image this soon as well but may have to wait - until then look forward to your final image.
    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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    Last night I set up to dial in my guiding after the mount was repaired.
    There was still a lot of declination slop that really disappoints me because that is what I sent the mount in for but I was determined to work out the kinks in declination.
    Guiding was rough and RA was not my target at this point.
    First screenshot is without any adjustments
    You can see the mount move when it tries to correct to stay locked on the guide star.




    I went into the mount setup utilities and adjusted the DEC backlash to 5 negative and 5 positive
    This was an improvement in guiding but still not enough to get 6 minute exposures without throwing most of the subs away.



    Once again I set the backlash this time 9 negative 9 positive with a little improvement



    I stopped the guiding and set the backlash to 13 negative and 13 positive.
    This allowed me to get 11 subs only tossing one when I tripped over the guide camera cable



    Short term screenshot not tripping over the wiring




    Still a long way to go but I’m getting there.
    next is the RA
    Ken

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    Hope you get it sorted soon Ken,
    here is has been cloudy - I may try to redo my mount lubrication and also get the periodic error sorted. In the meanwhile, I have got my webcam 900NC to talk to Pempro and I will be doing ccd polar and drift alignment. Will analyze my mount to see RA/DEC issues, and try to sort them after data analysis through Pempro.

    May post a guide how to sort and analyze mount issues with Pempro data.
    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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    Starting to get my guiding down finally. Now need to work on drift alignment and keep dailing every thing in. Here's one of my graphs from the other night.

    Clear skies,
    Tom.

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    Thanks Gus.
    The mount is sure putting up a fight.
    I went out last night to map areas of the sky that gave me the best guiding results and to get the Declination problem pinpointed.
    I found out that anything close to the pole is off limits for guiding for now ,but fine if I disable dec guiding for short subs (2 to 3 minutes) the rest of the sky I should be OK.
    I was able to get 6 x 360 " subs of M5 with better dec response but didn't have time to adjust everything because of a power problem (cheap jack on the mount).
    I stuck a screwdriver in the jack and pried the center prongs apart.
    after that I took the M5 subs then packed up.
    heres a short screen shot of the guiding on M5.






    declination moves back up gradually to meet the RA graph and no more spikes.
    RA is all over the place but thats next.

    Heres M5




    <iframe title ="Preview" scrolling="no" marginheight="0" marginwidth="0" frameborder="0" style="width:320px;height:212px;padding:0;backgrou nd-color:#fcfcfc;" src="http://cid-c6b477ad1b1dcb5b.photos.live.com/embedphoto.aspx/astrophotos/M5%206%20x%20360%20sec%20sd.png"></iframe>

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    Quote Originally Posted by Toml08 View Post
    Starting to get my guiding down finally. Now need to work on drift alignment and keep dailing every thing in. Here's one of my graphs from the other night.

    Clear skies,
    Tom.

    Smooth as silk
    I need to push my CG5 off a cliff
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