SVBONY SV135 Zoom Eyepiece, Zoom 7 to 21mm 1.25 Inch Telescope Eyepiece, 6 Element 4 Group Telescope Accessories for Astronomic Telescopes Visual

This review is for the Svbony SV135, 7-21mm, 7 Element 4 Group eyepiece with a 40 to 60 degree field view. I was fortunate to have clear skies the same day that I received the eye piece so I was able to use it right away. The only caveat was a moon that was brighter than I would have liked, given that I was trying to observe Jupiter and it's 4 larger moons. Nonetheless, the eyepiece performed very well, and for the price, exceeded my expectations. Rotating from the 7 to 21mm positions was effortless, with bright clear imaging. I will be taking my telescope to darker skies soon. However, if the brightness and clarity is this good with light pollution coming in from the city as well as the moon, I'm anticipating a very enjoyable experience when conditions become more favorable.

Any consideration of an eyepiece has to bring into account the price. With that understanding this is a very good value in my opinion. The eyepiece feels quality, Zoom is very smooth, very little refocusing, overall I think it's a very good value.

When I was looking at reviews I had seen other reviewers noting little imperfections (possibly dirt?) in the optics of these, so I looked for it straight off when I received mine, and sure enough it has a small black speck on the inside of one of the lenses. I would not have noticed it if I had not been looking for it, and I decided after trying it out that it affected my viewing pleasure insignificantly at this price point. If this was a $100 or up optic as all the other comparable zooms are I would not have tolerated it, but I am so happy with the overall build and performance of the zoom I decided not to worry about it. In normal use I don't even notice the speck, it takes intentionally looking for it for me to notice. I guess they need a cleaner work space or better air filtration or something where they assemble these, but I found nothing comparable at a comparable price anywhere (and I looked a lot) so I still recommend, though I also recommend a close inspection on arrival and actually using it to see if any imperfections affect your viewing experience. I use mine with a Meade StarPro AZ 70 f/10 for a 33x to 100x zoom range and it performs great throughout the range. If anyone is just getting started, looking for a great terrestrial viewer with an easy entry into planetary and moon viewing I am thrilled with the combination (I spent $200 combined - if you have a higher budget you might consider the larger StarPro 80, 90 or 102). Anyway, I love what I ended up with on a $200 budget and this zoom lens being priced so well has really lead to an even better overall experience than I expected on my limited budget. It's really simple to use and a lot of fun.

Very clear and wide optics , great value at a great price.

Great product that is very well made! Great value for the price!

The zoom has the following good points: Low scatter, high contrast, sharp to the edge at all focal lengths at f7.5, extremely good flare control, fairly good eye relief (not quite enough for glasses wearers), and smooth zooming. What's not to like?Well... A fairly narrow field of view at 21mm, and not all that wide at 7mm. Still, this is wider than the sometimes cheaper, narrower angle, 7-21mm sold by some other dealers, and the wider field is better corrected. You can't see what magnification you are using in the dark without using a light. This is where zooms with click stops come in handy. Even with a light, comparisons with fixed eyepieces show that the focal lengths marked on the barrel are longer than what the eyepiece provides by a significant margin, at least in the middle marks. Hence, you are using significantly more magnification than you might believe.That said, I use this over the much more expensive Baader zoom. The optical quality of the Svbony is matched by the viewing comfort. Here is the obligatory, "I have Takahashi and Baader orthos, but I use this zoom for my planetary viewing." I paid $50. What I got was a high performance eyepiece that I can comfortably sit and look through for hours.

Easy to zoom, sharp image and large field of view. Such a great upgrade from the stock eye-pieces came with the telescope, a 1000mm refractor.

Works great, being able to change magnification without changing eyepieces is an affordable game changer