The discerning observer will want to take a close look at the model UB2SD Barlow. With 27mm of clear aperture and full mulitcoatings, 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 Japan.
Clear aperture = 27mm / 1.06"
Total length = 76.0mm / 2.99"
Length of lower chrome barrel = 33.0mm / 1.30"
Length of upper black barrel = 43.0mm / 1.69"
Weight = 3.5oz.