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got it, i shouldn't be lazy. From bintel
"Apochromatic Design Gives Ultimate Power-Enhancing Performance. The Orion Shorty-Plus 2x Barlow features an air-spaced, three-element apochromatic optical design of 27mm clear aperture, for superior image sharpness and color correction. And, the Shorty-Plus boasts fully multi-coated optics for even greater light transmission. The Shorty-Plus doubles the magnifying power of any eyepiece, providing better eye relief and edge sharpness than you'd get using a shorter-focal-length eyepiece by itself to achieve the same power. Made in Japan."
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