Hi guys,
thanks very much for the feedback.
John your comments below nail the reason I've been thinking about screwing onto the diagonal. If I'm doing a deep sky observing session, its much easier to keep the filter on the diagonal rather than each eyepiece.
Quote:
Originally Posted by ausastronomer
The big advantage of using a 2" filter on your diagonal is that it will work equally well with 1.25" or 2" eyepieces and you can change eyepieces without having to unscrew and rescrew the filter.
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That being said, thank you for explaining the science behind this - I'm aware now that screwing the filter onto the diagonal isn't always going to work. I've been doing a fair bit of visual observation with the 80mm APO - i'm guessing that being a faster scope Im better of getting a 1.25" filter for this and screwing into the eyepieces? I'm using the Pentax XW with this scope.
cheers
Jeelan