FC-coated -ZOOM Eyepiece 7mm-21mm
The finest zoom eyepiece....... fully multi-coated optics......... High-eye relief
Now a casual telescope user can enjoy the benefits of zoom eyepiece from 21mm to 7mm or to any eyepiece focal length in between. Internal zoom lenses move on smooth and precisely machined parts. Performance is fully constant with the finest fixed -focal length eyepieces. A whole range of imported eyepiece in this one zoom eyepiece combined. Actual magnification range will depend on the focal length of your telescope. It works equally well for astronomical or terrestrial viewing. . Rubber traction ring ensures a good grip. The 1.25" barrel is threaded for filters and rubber eyecup are standard
Zoom eyepieces lets you change magnification power without changing eyepieces
A twist of Explorer II's housing changes focal length from 21mm to 7mm
Four-lens eyepiece has fully coated optics and exceptionally long eye relief
The 1.25" barrel is threaded for filters
Eyepiece | Multi-Coated Zoom Eyepiece 7mm - 21mm 1.25" OD
TELESCOPE SPECIFICATION Design MULTI-COATED ZOOM Eyepiece focal length 21.0mm - 7.0 mm Barrel size 1.25in. Apparent field of view 30.0-deg - 43 -deg Eye relief 33.0mm Coatings Fully coated Number of elements 4 Filter threads Yes Parfocal No Barrel security recess No Blackened lens edges Yes Rubber eyeguards No Body material Aluminum Weight (oz.) 5.67 Dimensions 3.2 in. x 1.6 in.