Eyepieces are commonly referred to by focal length and barrel diameter. The focal length of each eyepiece is printed on the eyepiece barrel. The longer the focal length (i.e.,thelargerthenumber) thelowertheeyepiecemagnification(i.e.,power)andthe shorter the focal length (i.e., the smaller the number) the higher the magnification.
Barrel diameter is the diameter of the barrel that slides into the star diagonal or accessory adapter. Your
| 1 1/4" Accessory | Focuser Tension | |
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| Screw | ||
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Thread |
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2" Focuser |
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Barrel | FocuserKnob |
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| Figure |