• Multiple uses; SV191 7.2-21.6mm zoom eyepiece allows you to change magnification power without swapping out eyepieces;
• 1.25 inches standard eyepiece; not only for astronomical telescopes; but also for spotting scope;
• 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.

Top Christmas Gift Ideas: Perfect Presents for Everyone!

• 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 etc;
• Adjustable focal length; SV215 3 mm to 8mm zoom eyepiece equivalent to multiple eyepieces; this helps you to zoom in and out rather than changing lens;
• Parfocal across the entire zoom range; minor tweaking may be necessary; you do not need to refocus every time you change the focal length;
• 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;
• Click and stops design; there are clicks and stops as you pass through the marked zoom levels; easy to use even in the dark
• Zoom ring moves smoothly; the zoom is smooth and gradual as you twist the eyepiece;
• 6-element of 4-group lens structure; fully multi-coated optics for remarkable sharpness; contrast and color correction.

Note: The front focal point of the SV215 is located inside the eyepiece body. It requires a main mirror with sufficient focusing range to ensure smooth and focused imaging.  Iis not suitable for 1.25-inch interface birding scopes. 

Top Christmas Gift Ideas: Perfect Presents for Everyone!

• SV193 0.8x focal reducer can take dazzling celestial photos without worrying about the distortion of the star points on the edge of the photo;
• The front is a standard 2-inch socket for connecting the main lens. The rear is a M48x0.75 thread for connecting the camera mount. Supports full-frame cameras
• The SV193 can be connected to a standard 2" filter thread to add the light pollution filter you need；
• The 0.8X defocus system shortens the exposure time. It can meet the needs of astronomical photographers who need sufficient exposure in a short time.

• FMC coating; The fully multi-coated objective lens ensures high transmittance for a brighter and clearer aperture, and providing clear, detailed and high contrast images;
• Wide angle; 26°wide angle binoculars gather more light than our eyes, so it works better in observing the moon, constellations, Milky Way etc;
• The long depth of field design; it almost seems as if you are standing on a very high mountain in absolute darkness; from the recent focus distance to infinity; no need to twist the eyepiece frame to focus and operation portable;
• With a magnification of 2.1 times, you can observe not just the main stars in a constellation, but many you have probably never even seen before;
• Finely crafted; fine workmanship; exquisite appearance; easy to carry; the objective lens has a standard 2-inch filter thread; which works better with a light-astronomical astronomical filter.

Top Christmas Gift Ideas: Perfect Presents for Everyone!

• SV193 0.8x focal reducer can take dazzling celestial photos without worrying about the distortion of the star points on the edge of the photo;
• The front is a standard 2-inch socket for connecting the main lens. The rear is a M48x0.75 thread for connecting the camera mount. Supports full-frame cameras;
• The SV193 can be connected to a standard 2" filter thread to add the light pollution filter you need；
• The 0.8X defocus system shortens the exposure time. It can meet the needs of astronomical photographers who need sufficient exposure in a short time.