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Hi,
As Andy indicated a zoom eyepiece can be extremely convenient in a small refractor used as a spotting scope. A zoom eyepiece can also be very convenient in an astronomical telescope. Just remember that a zoom eyepiece will always be a slight compromise optically. If your after convenience and aren't interested in extracting the last 5% of performance from the optical system then a zoom eyepiece is probably a good choice for you. The very best zoom eyepieces will never quite equal the optical performance of a high quality fixed focal length eyepiece. The top quality zooms like the Leica (over $1,000) come very close. The Nikon and Televue are also very good. As you spend less money the performance falls away a little. Mid priced zooms like the Hyperion do a pretty good job optically and are a good compromise.
Cheers
John B
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