I have the 1.25" and can't use it above my 20mm fl eyepieces. It works a treat too. This may sound dumb, but I've manually held it in place over my eye (have long eyerelief EP's) when using 30 and 40mm FL's, and it works, but just to try it out. Will look at the possibility of getting a 2" one later some time,
Clear skies
Nick
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