Feature(may vary by option.)
●One eyepiece for multiple uses; SV191 7.2-21.6mm zoom eyepiece allows you to change magnification power without swapping out eyepieces
●Parfocal design; changing magnification without refocusing
●7-Elements 4-Groups lens structure; 7-Elements 4-groups made of high index glass deliver sharp; high contrast vistas
●M28.5*0.6 filter threads; base of SV191 zoom lens has a threaded adapter which allows standard 1.25in filter
●18-20mm eye relief; twist up rubber eyecup and 18-20mm long eye relief provides comfortable long term viewing for people with or without glasses
●1.25 inches standard eyepiece; not only for astronomical telescopes; but also for spotting scope
[7.2-21.6mm]
Description
One eyepiece for multiple uses
SV191 7.2-21.6mm zoom eyepiece--Maintaining parfocality allows you to run through the focal length range without the need to refocus after each new magnification is set. But minor tweaking is necessary.
SV191 7.2 mm to 21.6mm adjustable focal length
42°-65° Apparent Field of View
SV191 7.2-21.6mm zoom eyepiece allows you to see different wide field of view under the same viewing conditions. Meet your different needs.
Zoom from low to high power in an instant
SV191 fully multi-coated zoom eyepiece zooms to any focal length between 7.2 mm and 21.6 mm - pick the better magnification for your subject.
Fully Multi-coated lens
SV191 zoom lens optic design increases light transmission, delivers bright, clear, high-contrast images even in low-light conditions.
18-20mm eye relief design
Exceptionally long 18mm-19.5mm eye relief range allows you to enjoy the entire field of view comfortably.
Twist-Up eyecups
SV191 7.2-21.6mm zoom eyepiece can meet the needs of most people; including the needs of users who wear glasses.
Suitable for starry sky, moonlight, and bird watching
The SV191 series zoom eyepiece not only allows for viewing moonlight and starry sky, but also supports the pluggable SV406P series bird watching glasses for perfect focusing.