Cahill Rooftop Observatory

Equipment Database - Astrola Zoom (21mm)

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Astrola Zoom (21mm)
Optical DesignZoom
Barrel Size1.25"
Threaded for FiltersNo
Focal Length21.0 mm
Field Stop14.4 mm
Apparent FOV39°
Eye Relief3 mm

Usable on:

We have one zoom eyepiece in our collection. Like many zoom eyepieces, it suffers from a narrow field of view and very dim images.