Celestron
Celestron 8-24mm Zoom Eyepiece 1.25" (93230) $148.95
The amazingly versatile Celestron 8mm - 24mm Zoom Eyepiece allows you to choose from a variety of magnifications in a flash! Description Simply grip the rubberized barrel and turn it slowly while looking through the eyepiece, and then pick the best power for the object you are observing. Alternatively, you can use the lowest magnification (24mm) to find an object and center it in your field of view, and then increase the power until the desired view is achieved. It is fast and easy, and lets you examine any object at various magnifications without requiring you to physically change eyepieces....
Baader Planetarium
Baader Planetarium Hyperion 8-24mm Clickst... $399.95
Hyperion Universal Zoom Mark IV: fourth generation of Baader-Zoom, 68° Widefield eyepiece with five magnifications - focal lenghts 8, 12, 16, 20 and 24mm clearly defined with "smoothed-out" improved Clickstop Action (a must for effortless binoviewing) Description Hyperion Mark IV Universal Zoom 8-24mm Eyepiece with 1¼" / 2" nosepieces and ClickStop-Action Zoom-lenses in general are not really famous for high quality optics. Also many zoom-eyepieces do not deliver the best possible image quality at high magnification because they were designed with focus on the price-tag so that image sharpness and field size is getting worse with increased magnification. The recognition...
Tele Vue Optics
Tele Vue 3-6mm Nagler Zoom (ENZ-0306) $558.00
The TeleVue Nagler Zoom is the "ultimate" tool for tweaking out the last bit of power that the atmosphere will permit. Description I did not set out to design a zoom eyepiece, per se. David and I were discussing characteristics we'd like in a superior "planetary" eyepiece, and the zoom feature answered one of the major goals; how to obtain the highest possible useful magnification on a given night considering the ever-changing atmosphere. There were other aspects of equal importance and only the combination of all would satisfy our ethos in creating a "planetary" eyepiece: full field sharpness for any speed...

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