It's no surprise that the eyepieces in our Sirius Plossl line are our best-selling telescope eyepieces. Quality this good usually costs a lot more.
Offering a wide 52° apparent field of view, these 7.5mm, 12.5mm, and 20mm Orion Sirius Plossl Telescope Eyepieces provide extremely sharp images of impressively high contrast. They are ideal for all types of telescopes: reflector, refractor, and catadioptric. The Plossl 4-element design is renowned for its outstanding performance, and has become the standard by which all other telescope eyepieces are judged.
The Sirius Plossl optical system is multi-coated for excellent light transmission. Lens edges are blackened to reduce scattering of stray light and maximize contrast.
The lenses are mounted in black-anodized aluminum housings with a 1.25"-diameter chrome-plated brass barrel for durability and precision fit. The barrel is internally threaded to accept standard telescope filters. The built-in rubber eyeguard enhances viewing by helping to block out ambient light and position the eye.
This Sirius Plossl Expansion Set includes three eyepieces: our 7.5mm, 12.5mm, and 20mm models.
The 7.5mm is superb for high-power planetary and lunar observation, and well suited to double-star viewing when stable seeing conditions permit.
The 12.5mm, a useful intermediate focal length, performs well on both deep-sky and planetary subjects.
For moderately low power scanning of open star clusters, and viewing of extended nebulas and larger galaxies, the 20mm model excels.
Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.
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Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.