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Originally Posted by matt
I have the Celestron Skylight Filter (#93621) permanently in place at the back of my 9.25.
Will I experience similar problems of potential field being limited?
The marketing hype claims it "Improves color saturation and balance" and "Can be used in conjunction with most Celestron photo/visual accessories"
Is this all just bulldust or what?
I have it in place to prevent dust entering the OTA
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Don't know about the C9.25, but with the 10" you have the option of the larger visual back.
I can't see that the filter would add anything to the image. Placing more glass/surfaces in the light path could only degrade the image. Unless you have a compelling reason to use it I can't see much point to the filter.
I do tend to change eyepieces over quickly rather than leave the tube open to the outside.