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Hi John,
You are right, but only if you are using the one filter at a time. The ring of the filter acts just like an extension ring, though it is shorter than the 14mm one. Alternatively, you can use other 2" filters instead of the Baader ones, though if the filter ring is of a different "extension" length than the Baader filter it will alter the perscribed focal length, but only marginally and it won't affect the performance of the EP. It will still work. I tried it. The change in magnification really isn't significant in a 1.1mm difference in focal length.
If you're looking at the Moon, the Sky Glow filter is unnecessary. The Moon filter would be the only thing you may need. But in your scope, I wouldn't think it necessary. I don't use a moon filter of any description with the Moon at high magnifications with either of my two 8" scopes. Low magnification is another matter of comfort. But it is a personal choice.
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