The SV213 3x Barlow lens (1.25") features a triple-element optic that effectively eliminates the image-distorting effects of chromatic aberration
.The sophisticated design of the barlow lens extends the focus of the telescope threefold, enabling high magnification for both visual observation and lunar-planet videos.
It is also ideal for use with astrographs with f/5 aperture and cameras with a 2.9 pixel size.Of course, a basic requirement for a product of this quality is that the surface of the lenses is coated with multiple anti-reflection coatings. The FMC layer not only protects against harmful reflections, but also maximises the light transmission of the lens system.
The SV213 barlow secures the eyepiece or camera with a clamping ring solution, protecting the tube from scratching. There's also a filter thread on the end to mount your 1.25" filter threaded device.