SVBONY Barlow Lens 2X 1.25 inch Metal Fully Blackened Telescope Accessory with M42x0.75 Thread Camera Connect Interface for Telescope Eyepieces for Astrophotography
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Features
- 1.25" 2x Barlow lens fully multi coated metal with M42x0.75 thread camera connect interface for telescope eyepieces
- Barlow lens 2x double the capacity of an existing set eyepiece;give a big magnification boost to any 1.25" eyepiece it's used with
- The housing is precision machined from aluminum stock and black anodized to a hard finish
- The lens edges and inner barrel is blackened to provide maximum contrast;chromatic corrected;provide high transmittance;ensure clear and sharp images
- Male T-thread on its back that can attach DSLR camera and other T thread type accessories;it accepts 1.25" filters;just remove the optical glass part and add the filter on if need
Brand: SVBONY
Eye Piece Lens Description: Barlow
Telescope Mount Description: 1.25 inches mount
Product Dimensions: 3.7"D x 1.96"W x 1.96"H
Focus Type: Manual Focus
Finderscope: Reflex
Item Weight: 3.52 Ounces
Lens Coating Description: Fully Multi-Coated
Product Dimensions: 3.7 x 1.95 x 1.95 inches
Item Weight: 3.52 ounces
Item model number: FUSF9156A
Is Discontinued By Manufacturer: No
Date First Available: August 17, 2015
Manufacturer: SVBONY
Country of Origin: China
Frequently asked questions
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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
PROS Easy to use. Versatile in that you can remove the lense to attach to an eyepiece or an astro camera. CONS It has no threads for attaching filters. This US epically irritating when using lens alone with an astro camera . I've also had some problems with focus with short barrel eyepieces. They will worknif lense is attached as a filter but again if you already have a filter focus is affected with no way to put filter on lens instead of eyepiece. I've sent this problem with Svbony with some filters also. They really need to correct this.
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Reviewed in the United States on June 17, 2023 by Fred J. Morgan Fred J. Morgan
It works. It was pointless for me to buy it because I don’t even need it but whatever I guess I’ll have to live with that for the rest of my life.
Reviewed in the United States on November 4, 2022 by Leo
The mechanical housing is well made, all anodized aluminum and easily disassembled. The lens is in a cell removable from the bottom (entrance end) of the assembly. If you remove the lens cell, then you have a simple 1.25 inch to T-mount mechanical adapter for direct projection. The top (exit end) receives 1.25 inch eyepieces, so you could insert an eyepiece to do eyepiece projection. This all works well, because you're not using the optics that come with the unit. What is disappointing is the negative lens included in the assembly. It's a 20mm diameter, -125mm focal length piece of plain, plano-concave, uncoated glass. Not a cemented achromat or even coated. So the sales specifications ("fully multi coated", "chromatic corrected") are risible, typical of those overseas friends who tell us what we want to hear without any correlation to what the words mean. The -125mm element is located 22mm inside of the telescope focuser's 1.25 inch eyepiece shoulder. The eyepiece receptacle is 38mm past the focuser's shoulder. Use the Barlow formulas to calculate what the effective magnification ratio is on your instrument. The magnification will be M = f/(f+d), where f = -125mm is the focal length of the lens, and d is the distance of the lens inside the focal plane of the lens. To achieve M = 2x as specified for this product, d would have to be -1/2 of f, or 62.5mm inside the focal plane. I don't see how that is possible with this tube that is shorter, so the actual magnification is going to be much less than 2x.
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Reviewed in the United States on November 24, 2018 by K fam
As an amateur, I am pleased with this Barlow lens. I have had a Celestron Omni AZ 102 telescope for a week now. The Barlow came just in time for me to use for the conjunction of Jupiter and Venus. I can see the rings of Venus and the moons of Jupiter with the 10mm eyepiece that came with the telescope, but this Barlow lens makes them much clearer. I have found that I do need to refocus my telescope when switching out the plain eyepiece. I noticed some reviewers mentioning that they did not need to refocus.
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Reviewed in the United States on December 22, 2020 by George
All metal, very high quality and reasonably priced!
Reviewed in the United States on January 13, 2023 by jlax
When I got it, it came with no instructions. I tried all different ways to attach it and could not do it so I was going to return it. The treads, didn't tread into anything. I decided to look at the mfg. of the telescope site and see if they showed how to use their original piece which was more than double the price of this. It did. I had to remove the eye piece that was there, drop this one in it's place, put the original one into this, and that was it. I don't know why the threads are in it. Anyway, it did a great job of doubling what I was seeing without it. A nice piece with good optical glass. Don't know why they don't put instructions in.
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Reviewed in the United States on October 27, 2015 by Eudice
I can't use this on my telescope because of the focus length. I dropped a star because the machining of the tightening screw was a little jagged and i had to file it down a bit so I could set an eyepiece into it. I plan on buying a new telescope and hopefully I will be able to use this with it. The 3x I got with my Travelscope is plastic and cheap feeling. This piece feels quality made, aside from my earlier complaint.
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Reviewed in the United States on September 10, 2017 by Peter
While the build quality of the Svbony 2x 1.25" Barlow is very good and solid, the optical quality of the glass leaves much to be desired. The product description, and even printed on the product itself, states that this is fully multicoated glass. Not sure what it is multicoated with, but viewing through it left me wishing I had never bothered wasting my time trying it out. Even with a Nikon DSLR attached, the clarity of the photos were horrid. The chromatic aberration was awful, to the point that I could barely remove it all with a chromatic aberration removal plugin in Photoshop. Before removal, every bright night sky object has a bright blue halo around it, much worse than any other lens I've ever used. Just like regular photography, do yourself a favor and save up for quality glass. The quality of your photos (and view through the telescope) suffer greatly if you decide to go cheap.
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Reviewed in the United States on October 1, 2020 by Kurt Harvilak