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standard 1.25" filter threads????
Karl,
As far as I know the standard 1.25" filter thread, if you can call it that is a 28.5mm thread.
Over the years I've found many problems (like you at the moment!) where filters will just not fit!!
All I can say is the Celestron, Meade, Schuler, Baader and many of the "filter extensions" and the x0.5 GSO reducer all seem to fit my TV plossls.
The problem is somewhere between the eyepiece manufacturer and the accuracy of the filter thread.
For filter wheels, all my filters fit the AtiK USB wheel but I did have problems earlier on with a manual filter wheel from the states, where very few, if any of my normal filters would fit.
BTW the thickness of the filters can also vary ( especially the Baader) and some filter wheels don't have enough internal clearance to allow them to operate.
Just my 2c
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