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Thread: PhD guiding long focal length

  1. #1
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    Default PhD guiding long focal length



    I'm guiding a small fsq refractor with an 11" edge. My question is it better to use the focal reducer on the edge or is that unnecessary added weight ? Do I need to change the exposure time or something in PhD or is it automatic ?
    11" edgehd Cge pro, takahashi fsq 85. To many filters and things to name, favourite being 31mm luminous and mk3 Baader zoom. Astro modded canon 6d and zwo 174

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    Default Re: PhD guiding long focal length

    hi there Kencrichton are you using PHD2 (Open PHD)or PHD1 in any case you would have to change the the focal length in the scope set up and also make some other changes if guiding through your SCT its a bit of mucking around but once you get the guiding good in the SCT write the setting down so if you change back to guiding with the refractor and change back to the 11" you won't have to much trouble setting it up again and I would suggest writing down the setting for the refractor as well .
    I have a reducer in my 10" SCT but I also image with this as well but when I am guiding with the SCT I just keep it in
    hope this helps cheers Pete
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    Default Re: PhD guiding long focal length

    Yes I'm using PhD 2 , I have changed the focal length to 1960 which I believe is correct with a 0.7 reducer . I have also added the pixel size of camera 5.86 zwo asi 174. What other things should I be changing , exposure time ???
    11" edgehd Cge pro, takahashi fsq 85. To many filters and things to name, favourite being 31mm luminous and mk3 Baader zoom. Astro modded canon 6d and zwo 174

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    Default Re: PhD guiding long focal length

    Actually when I first start the calibration it says "calibration questionable, not enough steps " ???
    11" edgehd Cge pro, takahashi fsq 85. To many filters and things to name, favourite being 31mm luminous and mk3 Baader zoom. Astro modded canon 6d and zwo 174

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    Default Re: PhD guiding long focal length

    yep those have to be adjusted as well calibration steps are important you have to adjust them to suit the 11" with the 0.7 reducer .
    there is a couple of good tutorials on youtube from memory .
    can't tell you how many steps I use for my 10" SCT as I am away at the moment .
    how is your guiding through the refractor ?
    cheers Pete
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    Default Re: PhD guiding long focal length

    Haven't done any guiding yet with the refractor just getting into the photography side of things . So you say I need to add more calibration points ? I do this manually before the process starts ??
    11" edgehd Cge pro, takahashi fsq 85. To many filters and things to name, favourite being 31mm luminous and mk3 Baader zoom. Astro modded canon 6d and zwo 174

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    Default Re: PhD guiding long focal length

    I would suggest setting it up on you refractor first and use it for guiding to get the feel for it as it would be easier to set up on the refractor first get the guiding spot on with that and by then you will know what setting does what if you use the refractor first the default calibration should be good to go .
    cheers Pete
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    Peter.

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    kencrichton (01-08-2016)

  9. #8
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    Default Re: PhD guiding long focal length

    Ah ok thanks Pete I thought imaging with the long focal length would be much harder even with a guider . I'll try that tonight
    11" edgehd Cge pro, takahashi fsq 85. To many filters and things to name, favourite being 31mm luminous and mk3 Baader zoom. Astro modded canon 6d and zwo 174

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    Default Re: PhD guiding long focal length

    my main imaging is done through the 10"SCT with focal reducer only every now and the I use the William optics GT81 for wide field imaging but thats just me mainly like imaging Galaxies .
    good luck with it PHD has a small learning curve to get the basics and you up and guiding but it does get bigger but not to bad it is a fairly straight forward and great guiding program .
    cheers Pete
    GSO 10 " Truss Newt AstroGraph
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    Default Re: PhD guiding long focal length

    The other two messages I get from phd2 are " bad pixel map" and "no dark frames in library" I guess there related. Is it essential to have a dark frame library , how can I do this ?
    11" edgehd Cge pro, takahashi fsq 85. To many filters and things to name, favourite being 31mm luminous and mk3 Baader zoom. Astro modded canon 6d and zwo 174

 

 
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