SVBONY3X Barlow Lens, Fully-Multi Coated Achromatic Barlow Lens, 1.25 inch Telescope Accessories for Astronomical Visual and Photography

This 2x Barlow works great. The low price is a bonus.

To my surprise, this barlow lens is very good. I was not expecting the build and lens quality to as good as it is for the price. What really surprised me is the optics. Very clear and has very little if any reduction in light transmission to the eyepiece, which I did not expect for such an inexpensive barlow. Highly recommend for anyone who wants a good quality barlow without spending a lot.UPDATE: I just wanted to add an update on some testing and comparison I performed with this Barlow lens and a GSO Shorty Barlow. First, you will notice that SVBONY has reduced the diameter of the barlow element, compared to the GSO Shorty. The reason for this is to allow full insertion of the lens assembly into a scope with a diagonal eyepiece socket. That is a good thing, as it prevents the barlow lens from contacting the internal diagonal mirror and damaging it. With the GSO, the barlow cannot be inserted the entire way to the housing stop, since it will contact or damage the diagonal mirror. I thought that this diameter reduction may also reduce the light transmission, compared to the GSO, but in my testing that was not the case. I found the SVBONY optics to be a little brighter and clearer than the GSO. My only conclusion is because this particular SVBONY 3x barlow has a THREE element vs the two element in the GSO shorty. The only plus I have found with the GSO over the SVBONY, is the ability to remove the barlow element and thread it onto the eyepiece. That gives an option to reduce the magnification from a 3x to 2.5x, something you cannot do with the SVBONY. For me, that is not an issue and I would still recommend the SVBONY over the GSO brand, due to its better quality element and better fit into any scope.

The optics of this barlow are perfectly fine, but I'd recommend getting the $17.99 2x barlow also offered by svbony which includes a compression ring. This will make sure that your eyepieces are not scratched by the tightening screw. They actually have 3 different 2x barlows for some reason, this one for $16.99, one for $17.99 with a compression ring, and another for $17.99 with a compression ring and t-thread. I'd recommend getting the one with a t-thread, it costs no extra money and it'll be useful if you happen to have/to get a camera that uses it.

Nice barlow for a lot less money, good to have around.

I'm just an amateur getting into stargazing so I don't have much to go by. All I can compare this to is some other eye pieces I have. The quality appears to be great, all metal, nice finish, clean glass and the glass is coated. Eyepieces easily drop in, can be tightened up, and easily come out. I primarily use it with a 25mm stock Celestron eyepiece, but also 15mm and 9mm eyepieces. The images look sharp and are pleasant. Between the 25mm + Barlow, versus using the 9mm eyepiece, the barlow combo is much more enjoyable, as their is less blackout at that magnification compared to using the higher mag eyepiece. I've used the barlow with my other eyepieces and gotten very clear magnified views of the moon. Even on nights of poor seeing I enjoyed the higher power views of the moon. Since the planets are far away/not visible right now, I have not gotten to use it on them yet.

I have used this with Celestron COSMOS FirstScope Telescope for several months with satisfactory experience; and you can't beat the price. However, I hesitated in writing a review because I am inexperienced with telescopes despite good general knowledge about optics. But a recent encounter with Meade Instruments 216005 Polaris 127 EQ Reflector Telescope (Blue) has boosted my confidence, as I can compare this side by side with a Meade Barlow, on two different telesscopes.The construct of this product, metal body and all, is very refined compared with the plastic body that comes with Meade. My untrained eyes cannot detect visible aberration in this VITE Barlow. In contrast, the Meade Barlow gives very obvious chromatic aberration when I tested both Barlows on Cosmos FirstScope as well as on Polaris 127EQ.Meade is an established brand name. So this comparison weighs a lot in my mind even though Polaris is in Meade's low-end.Update: I have since used this VITE on a much better telescope SkyWatcher S11600 Traditional Dobsonian 6-Inch (White). The scope's collimated parabolic mirror provides clearer images on the edge of field of view so it is easier to evaluate quality. I stack the 2x Barlow with the 20mm Kellner from the FirstScope and compare with the 10mm Plössl that comes with SkyWatcher. FirstScope's eyepieces are not as good as SkyWatcher's; stacking two optical elements together is generally worse that one piece of the same focal length. Even so, the Barlow combination compares favourably. (The picture of Jupiter and its four Galilean satellites is taken with the 4mm from VITE Telescope Eyepiece Set Aspheric 4/10/23mm 1.25" Wide Angle 62-Deg Fully Coated for Astronomical Telescope and the 2x Barlow on FirstScope.)

Just keep your expectations real. Don't expect a $24 barlow to perform like the $300 counterpart. Having said that it does enhance the eyepiece magnification with marginal results. Tested it looking at Achird in Cassiopea using a Meade var zoom 8-21 eyepiece and a 16mmTeleVue Nagler and a 13mm TeleVue Delite eyepice. The telescpoe was a 120mm F5 skywatcher refractor. While able to split the double star and see the color difference I couldn't foucus to a pinpoint. There were considerable Starburst effect on all eyepieces. This barlow could be a good choice for someone in a budget. If you are serious about your observations I would look at other more expensive brands.