Product: SVBONY SV135 Telescope Eyepiece Zoom 7 to 21mm 1.25 Inch Zoom Eyepiece Fully multi Coated 6 Element 4 Group Zoom Lens Telescope Accessory for Astronomic Telescopes
Brand: SVBONY
SVBONY SV135-This is definitely a must for beginners to start a good eyepiece collection.with this eyepiece, you can enjoy planetary astronomy without spending a lot of money.As a beginner;SV135 is great for starter astronomer!

 7mm-21mm linear continuous zoom
 Regarding the zoom action; it is stiff enough that you won't accidentally shift focal lengths; but it is also smooth enough that you can rotate it without holding the base of the eyepiece with your other hand

 High quality optical design
 6-Element 4-Group premium optical with FMC ultra high quality standard coating;It also ensures the transmission of light up to 97% while reducing the loss of light during transmission

 40-57°Field of view
 It also gives you a clear and bright angle of view while ensuring you get the magnification you need;Compatible with any telescope that accepts 1.25 inch eyepieces

 M28.5*0.6 filter thread
 SV135 zoom eyepiece has M28.5*0.6 threads on the bottom very convenient for connecting filter;Works great for photography

 Note:This zoom eyepiece just for 1.25inch telescope; can't match with spotting Scope

 Technical parameters:
 Focal length: 7-21mm
 Zoon Type: Linear
 Lens structure: 6PCS / 4group
 Eye Relief: 18mm - 16.3mm
 Interpupillary Dist.:15mm
 Barrel Size: 1.25" 
 Field of view: 57~40° 
 Coatings: Fully Multi-Coated-Green 
 Rubber Eye Guard: Yes 
 Meterial: Metal
 Color: Black
 Thread Size: M28.5*0.6
 Overall length: 93mm
 Net Weight: 133g / 4.67oz

 Package Include:
 1xSVBONY SV135 7-21mm 1.25 inch Eyepiece
 1xLens Covers (Objective and Eyepiece)
 1xLens Cleaning Cloth

SV135 7 mm to 21mm adjustable focal length;SV135 7-21mm zoom eyepiece equivalent to multiple eyepieces ;obtain higher magnification with short focal length;It could bring you a better observation experience in a comfortable situation with high-contrast imaging
18mm - 16.3mm comfortable eye relief; especially for eyeglass wearers ;designed primarily for viewing landscapes and astronomical observations of lunar surfaces; planets; nebulae; clusters; and diffuse nebulae
Fully multi-coated Premium eyepiece;The true fully multi-coated Premium eyepiece with superior edge and center sharpness than normal PLOSSL eyepieces; 6-Element 4-Group premium optical design for superior optical performance
Standard 1.25" eyepiece;Equipped with a precision-made standard 1.25-inch lens barrel that is compatible with any telescope that accepts 1.25-inch eyepieces; Rubber eye guard for comfortable viewing and blocking stray light
A cost-effective eyepiece;Full metal body; fine appearance; 40 degree - 57 degree wide angle field of view; high brightness observation is very comfortable ;you will obtain more details that you have never seen before

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