Feature(may vary by option.)
●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
[7-21mm]
Description
Zoom from low to high power in an instant with SV135 versatile eyepiece
SV135 fully multi-coated zoom plossl eyepiece zooms to any focal length between 7 mm and 21 mm - pick the better magnification for your subject. As a beginner; SV135 zoom eyepiece is good for starter astronomer!
7mm-21mm linear continuous zoom
Regarding the zoom action; it is stiff enough that you wont 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
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
Fully Multi Coated
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
More eyepiece details
 3-8mm Zoom Eyepiece |  8-24mm Zoom Eyepiece |  7.2-21.6mm Zoom Eyepiece |  10-30mm Zoom Eyepiece |  30mm Plossl Eyepiece |  17mm Telescope Lens |  6mm Telescope Eyepiece | |
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Price
| $149.99 | $75.99 | $79.99 | $54.99 | $43.99 | $20.99 | $35.99 |
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what to do with it
| observe Venus: Jupiter; Saturn | Bird watching and viewing | visual deep sky | visual lunar surface | for Astronomy Telescope | 4 Elements Design | 5-elements in 3 groups |
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Matching kit
| for amateur astronomers | compatible with C90 C5 Scope | compatible with SV503 SV188P | compatible with SV139 filter | Good workmanship | Non-slip Cover | 16mm eye relief |
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Matching highlights
| 3mm to 8mm | Low and High Power Viewing | Portable Sky watching Kit | Reduce glare | Fully multi-coated optics | full broadband multilayer coat | Fully Mutil Coated |
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The effect brought1
| Parfocal Design | Constant eye relief | ensure comfort | see more lunar detail | Matt blackened | Extinction Ink | Edge blackened optics |
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The effect brought2
| Click and stops design | Super-wide Angle | Decent eyepiece | see more surface features | 50 Degree Field | 48 Degrees Field | 66 Degrees Field |