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Declination Guiding

Help! :-)

 

These graphs are from three separate nights of guiding. After the first night I thought that balance was the issue but I’m sure I’m well balanced now and the declination is still all over the place.

 

Apart from increasing PHD's capture timing the settings are all default. Anything I can try there? I’m guiding a 150p (750mm focal length) with Orion 50mm finder.

 

They were all still nights, no wind, although surely that would have also had an affect of the RA?

 

Last night’s guiding started off really well for 20 mins or so before it suddenly went mad. Any ideas that I can try to work out what’s causing this?

 

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Uploaded on September 28, 2011
Taken on September 28, 2011