Designed to fit snugly over the aperture of your telescope, these optical glass filters block 99.999% of incoming sunlight, allowing you to safely obs...
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The custom-designed Mars Observation filter enhances contrast of virtually all surface features. Dielectric coatings transmit violet/blue (615nm) wave...
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While star diagonals correct a refractor's inverted image, they don't correct the left-right orientation. For terrestrial viewing at moderate magnific...
A good barlow needs good optics, but good optics alone aren' t enough. Unlike many barlows, ours are internally baffled, rather than simply painted bl...
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Many observers prefer to use a good-quality mirror diagonal instead of a prism diagonal with high-end telescope systems. The mirror in these 90-deg di...
eBay offers you smart deals and the widest selection, ranging from the everyday basics to things that are as unique as yourself. With millions of item...
Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produc...
