The discerning observer will want to take a close look at the model UB2SD Barlow. With 27mm of clear aperture and full mulitcoating, this 3-element apochromatic design delivers high contrast images with superior color correction. Not threaded to accept standard 1.25" astronomy filters. Includes dust caps. Made in Canada using Japanese optics.
This new version of Antares' popular UB2SD barlow features an integrated twist-lock adapter to securely center and hold your eyepiece. The inner compression ring is made of polypropylene and will not mar your eyepieces. Unscrewing the twist-lock ring exposes a male T-thread underneath which can be used to couple imaging devices with the barlow.
Clear aperture = 27mm / 1.06"
Total length = 77.6mm / 3.05"
Length of lower chrome barrel = 32.8mm / 1.29"
Length of upper black barrel = 44.7mm / 1.76"
Weight = 4.5oz.