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Originally Posted by BLiTZWiNG
Thanks Eric!
I actually have this funny feeling that the barrels of my eyepieces are all 1.25", but I'm not at home to check that. Just going from memory they are roughly 1" and I'm pretty sure they aren't 2".
Looking at the 8" on Andrews comes with 1.25" and 2" -> 1.25" adapters. Mine is an 8" GSO that I got from Andrews 6 years ago, so it's probably safe for me to say it's 1.25", though I guess its not much of a hassle to get an adapter!
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Trent, if you have a 1.25" focusser, you will only use 1.25" eyepieces. You can use smaller barrel diameter eyepieces in a larger focusser (using the adapter), but not vice versa.
But it is a fairly easy job to swap your 1.25" focusser for a 2" focusser. A secondhand 1:1 2" GSO Crayford focusser can be had for a handful of dollars from IceTrade classifieds.