152mm Aluminum Tube Achromatic Refractor
The classic air-spaced, crown-and-flint, doublet achromatic refractor is reborn with the aim to produce superior-class optical figure in a short (f/6.5) focal length design with[…]
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Day: February 14, 2018
Glow-in-the-Dark Constellations
90,000 stargazers can’t be wrong! Our original Glow-in-the-Dark Constellations was such a hit that we’re bringing it back in an affordable paperback edition for a[…]
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