![]() ![]() It uses an ED (Extra-low Dispersion glass) center element to reduce spurious color halos and fringing to vanishingly low levels. No matter how you look at it, at the price, the Astro-Tech AT130EDT is an absolute steal!ĮD apochromatic triplet refractor optics: 130mm (5.12") aperture, 910mm focal length, f/7 focal ratio. This feature-laden 130mm Astro-Tech ED triplet apochromatic refractor offers optical and mechanical performance nearly the equal of scopes many times its reasonable price. The supplied 2" and 1.25" eyepiece holders use non-marring compression rings that won't scratch your eyepiece barrels. In addition, a built-in camera angle adjuster lets you fine-tune the composition of your astrophotos. The focuser can rotate a full 360° to put your camera or eyepiece in the most comfortable observing position. The finely-machined scope has a dual-speed 2.5" rack-and-pinion focuser with a microfine 10:1 fine-focusing ratio. The Astro-Tech AT130EDT's slow-polished triplet optics, ED glass center element, and state-of-the-art optical multicoatings are even more impressive when you consider the package they come in. To our minds, that makes the Astro-Tech AT130EDT an exceptional value. But while they can cost nearly four times as much, many observers will be hard-pressed to justify the cost difference between those other scopes and the Astro-Tech AT130EDT. Do they perform nearly four times better than the Astro-Tech AT130EDT to justify the price difference? That's up to you to decide. ![]() There are competitive 130mm-range apo scopes that can cost up to $6500 and more.
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