Specifications:

Features

1. SV215 zoom eyepiece is a good assistant for you to observe and take pictures of the planets; it is a good helper for the amateur astronomers to observe Venus; Mars; Jupiter; Saturn and so on
   2. Adjustable focal length; SV215 3 mm to 8mm zoom eyepiece equivalent to multiple eyepieces; SV215 eyepiece is much better than the kit eyepieces; this helps you to zoom in and out rather than changing lens
   3. Parfocal across the entire zoom range; minor tweaking may be necessary; you do not need to refocus every time you change the focal length
   4. Constant field of view and eye relief; the apparent field of view and the usable eye relief to stay the same as the focal length changes
   5. Click and stops design; there are clicks and stops as you pass through the marked zoom levels; easy to use even in the dark
   6. Zoom ring moves smoothly; the zoom is smooth and gradual as you twist the eyepiece; it is very hand-friendly
   7. 6-element of 4-group lens structure; fully multi-coated optics for remarkable sharpness; contrast and color correction
2. 8. Smooth zoom action with click-stops at 3, 4, 5, 6,7 and 8mm for quick changes to precise preset magnifications
   9. Parfocal across the entire zoom range (minor tweaking may be necessary, however).