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I've had PHD issues for ages, mainly, as far as I can determine from the low contrast caused by LP in my location. So I am in process of experimenting ( delayed by the Ob roof being blown off ) with a filter on the guide scope. Not your usual LP type filter but a pale blue C80A camera filter. I tested it through my DSLR on widefeild and it has a similar but much less pronounced profile to a CLS LP. Testing gave a much reduced red glow to the images but still holding close to the real colour on the DSLR, always an issue using a full LP filter such as CLS.
Hopefully I'll finish and re-assemble the system this weekend and get back to my testing. Also will try it on the DSLR for imaging as it gave me a blue\black sky on 20 sec exposures whereas before I would see red intrusion easily by then normally.
All I need to do is paint the roof and remount and align the head and scopes.
And wait for the weather to come right.
Try a blue filter on your guidescope if LP is your issue. Our camera shop was selling them at 5 for $10, they are not needed on a Digital SLR of course so the market has disappeared.
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