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Thanks Greg and Dave!
I've been looking at the Baader filters and they are of interest. I took note of some very nice examples done with a TEC140.
It does look like the Astrodon filters would give perhaps the best protection against LP, but would allow LP in the green channel. It seems my "idea" woud only be partially successful.
I have been imaging with the Hutech IDAS LP filter in front of Astronomik filters with my KAF8300 chip camera. It does work, but I want to use the ONAG guider and this is a difficult solution as the fitting to the camera/filter wheel is T-thread and my filter is 48mm. The filter cannot go in front of the ONAG as there will then be no IR light to guide on! So, putting the LP filter in the wheel solves that not little issue, but creates a problem in green and maybe red. Perhaps Precise Parts can make some sort of adapter. I suppose I can just try out the idea and if the LP is too hard to control try to find an alternate solution.
Peter
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