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Dear Demise
I am new to this group but not new to astronomy.
Yes eyepieces are interchangeable between scopes and there are 3 standard sizes.
The most common are 1 1/4 inch, 2" and 0.975"(I think) in diameter.
Most of the little ones (0.975) are of poor quality and few of the better telescopes have adaptors for them. The standard is 1 1/4" but more expensive and bigger scopes will take the 2" eyepieces and use an adaptor to take the 1 1/4".
Magnification is determined by the focal length of the eye piece and the focal length of the scope. If you telescope has a focal lenght of 1000mm and your eyepiece is 10mm then the magnification is 100x. Reducing the focal length of the eyepiece will increase the magnification. In theory you can use any magnification combination but there is a limit to how much magnification is practical. This is determined by the diameter of your scope.
I hope this helps.
Terry B
Armidale
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