• 90-degree 2" mirror diagonal features sophisticated, lab-tested dielectric coatings that provide an astounding 99% reflectivity
• Dielectric mirror coatings are more durable than enhanced aluminum coatings and provide higher reflectivity for maximum view brightness
• Machined and anodized aluminum housing features machine-threaded glare baffles for high contrast
• Nosepiece barrel is threaded to accept 2" Orion filters, a 2"-1.25" step-down adapter is included
• The diagonal is a great way to make nighttime viewing orientations through a refractor telescope more comfortable

• The Orion ED80 refractor's short focal length and superb apochromatic optics make it a great telescope for astrophotography and visual use
• The included Sirius EQ-G GoTo equatorial telescope mount and tripod supports the ED80 refractor with strength to spare for accomodation of additional astrophotography gear
• The ED80 sports a multi-coated 80mm objective lens doublet of 600mm focal length (f/7.5) made with extra-low dispersion FPL-53 ED glass for great visual and astrophotographic performance
• The state-of-the-art Sirius EQ-G GoTo mount contains a computerized database of over 42,000 celestial objects to explore and photograph
• Includes 8x40 finder scope for easy aiming, 25mm Sirius Plossl 1.25" eyepiece, 1.25" prism star diagonal, telescope tube rings, Starry Night astronomy software, and more

Are you a serious amateur astronomer looking for the best and brightest wide-field images of the night sky with binoculars? The Orion 20x80 ED GiantView Binocular will fit that bill! These binoculars combine a large 80mm aperture with Extra-low Dispersion (ED) glass lenses for bright, exceptionally clear, true-color views of the night sky. Not to mention these binoculars work equally well for long distance daytime viewing. All of this in a waterproof body, with BAK-4 prisms, robust mechanical construction, and a solid pier tripod mounting system. And all these features for a very reasonable price.

You'll understand the combination of large aperture and ED lenses the first time you scan the Milky Way — pinpoint stars, with exceptional contrast against a dark background. Fully Multi-Coated surfaces provide the brightest possible images, and with 18mm of eye relief, even eyeglass wearers can view the entire field of view. And these binoculars boast a 3.2° field of view for scanning the skies, or watching distant wildlife.

The sturdy aluminum alloy body with a second hinge between the objective lenses provides a solid, well collimated mechanical system. Glare-threaded and blackened interiors provide even more contrast with less light scatter. The built-in tripod mounting bar attaches securely to a standard photographic tripod, and each binocular comes with lens caps, neck strap and a soft carry bag.

• Revolutionary new stereo binocular viewer design has big advantages over traditional binoviewers
• With zero backfocus requirement, can be used with any type of telescope - even Newtonians - without need for extender lenses
• Features a dielectric-coated beam-splitting mirror - not a prism - which reduces aberrations and improves contrast
• Twist-tight collars on the eyepiece holders are self-centering to eliminate problematic eyepiece offset.
• Use any two 1.25" eyepieces (sold separately) for 3D-like, immersive views of astronomical and scenic daytime subjects

• Superwide adapter provides widest clear aperture possible for full-frame DSLR imaging performance without vignetting
• Integrated Nikon F-mount bayonet
• 10mm optical length
• Tapered 2" barrel couples adapter to 2" telescope focuser more securely than typical T-adapters
• Glare-threaded, flat-black interior ensures excellent contrast

• This thorough kit of 2" telescope accessories presents an affordable introduction to lower-power, wide-field stargazing - ideal for anyone interested in exploring deep-sky objects
• Kit includes three 2" Orion DeepView telescope eyepieces - 42mm, 35mm, and 28mm focal lengths
• The included 2", 2x Barlow lens allows you to double the magnification of each included telescope eyepiece for versatile performance
• Included 2" Orion SkyGlow Broadband Filter helps combat light pollution so you can get the most out of your wide-field observations
• Everything fits nicely in the included pluck-foam accessory case

• Compact mini guide scope designed for use with astrophotography telescopes up to 1500mm focal length
• Mini 50mm guide scope with bright, wide-field optics puts numerous potential guide stars in view so you'll never have to search for one!
• Adjustable-aim dovetail guide scope bracket installs on virtually any astrophotography telescope quickly and easily
• Very small and compact autoguiding system adds hardly any weight to an astrophotography setup and can conveniently be stashed in an accessory case between uses
• Designed for use with Orion StarShoot AutoGuider (sold separately) and other similar small-chip CCD autoguiders

• Provides a platform for coupling telescope optical tubes to Orion AstroView, SkyView Pro, Sirius, and Atlas equatorial (EQ) telescope mounts
• Attach telescope tube rings (sold separately) to the dovetail mounting plate for easy, no-tools attachment of the telescope to an Orion EQ mount
• Thirteen inch long plate is especially useful for longer focal length reflector and refractor telescopes
• Made of extruded, anodized aluminum
• Includes four optical axis offset adjustment screws

• Versatile 60mm aperture Guide Scope with a built-in helical focuser for precise focusing of potential guide stars
• Designed for use with the Orion StarShoot AutoGuider and StarShoot AutoGuider Pro (both sold separately)
• Helical focuser collar will not rotate attached autoguider devices during focus adjustments
• Can also be used as a deluxe straight-through finder scope with optional 1.25" eyepieces installed (eyepieces sold separately)
• Weighs just 2 lbs., 0.1 oz.

• Heating band for use with Orion Dew Zapper Pro 4-Channel Dew Prevention System and medium aperture telescopes
• Sized to fit 150mm (6") to 203mm (8") telescope optical tubes to prevent dew accumulation from disrupting view quality
• Features 6' cable with right-angle connection for snug fit
• Made in the U.S.A.
• Requires Orion Dew Zapper Pro 4-Channel Dew Prevention System Control Module (sold separately) for operation

• Inspire young stargazers with this beautifully illustrated children's astronomy book
• Join our astronaut guides on a tour through the Solar System and beyond
• Learn about constellations and the mythology behind them
• Amaze friends and family with fun astronomy facts
• 48 pages packed with colorful illustrations, seasonal star charts, and interesting information all about space and the stars!

• An indispensable reference guide for observing the "Red Planet"
• Identifies Martian features using classical albedo and modern nomenclature
• Second Edition lists Mars opposition and observable conjunction events from 2020 through 2026
• Recommends best filters for visual observation and astrophotography of Mars
• Plastic-laminated for durability, measures 25.25" x 11" when fully unfolded, and folds up to 8.5" x 11" for easy portability

• The meticulously detailed MoonMap 260 is a must-have for any backyard astronomer
• Map identifies over 260 lunar features including craters, valleys, ancient lava flows, mountain ranges, all successful US and Soviet lunar mission landing sites, and more
• Conveniently laminated for protection against dew, dirt, and the elements
• Measures 25.25" x 11" when fully unfolded, and folds up to 8.5" x 11" for easy portability
• Includes both correct-image and reversed "mirror image" maps of the Moon for easy use with binoculars, unaided eyes, or any telescope

• An ideal reference for observing ringed Saturn and its brightest moons
• Identifies atmospheric features of Saturn using standard nomenclature
• Updated Second Edition lists Saturn oppositions and observable conjunctions from 2020 through 2026, and shows ring inclination at opposition for each year
• Recommends best filters for visual observation and astrophotography of Saturn
• Plastic-laminated for durability, measures 25.25" x 11" when fully unfolded, and folds up to 8.5" x 11" for easy portability

• The SkyGlow filter enhances deep-sky observing in moderately light-polluted skies
• 2" eyepiece filter blocks the most common wavelengths of light pollution for increased contrast and better view quality
• SkyGlow improves the views of nebulas, galaxies and star clusters, especially when viewing in areas with light pollution from streetlights
• Ideal for backyard astronomy oberving when you don't have time to trek to a dark sky site
• 2" filter designed for use with 2" telescope eyepieces. Metal filter cell construction.

• Use this specially designed 2" astrophotography filter for deep-sky imaging from areas suffering from light pollution
• Lets you capture astrophotographs in light polluted skies with CCD or DSLR cameras by blocking up to 99% transmission of specific wavelengths responsible for light pollution while passing through vital light wavelengths for pleasing images
• Enhances contrast of all types of deep-sky objects: galaxies, nebulas, and star clusters
• Filter with metal filter cell preserves neutral color balance, eliminating need for corrective color processing later
• Enables longer astrophotography exposure times without background saturation due to sky glow pollution

• Double the power of any 1.25" telescope eyepiece with this T-adapter equipped Barlow lens
• Male T-threads allow secure camera attachment for high-magnification lunar and planetary astrophotography
• A great way to double the number of magnification options, without having to buy twice as many eyepieces
• Doublet lens system is multi-coated for excellent transmission and the internal housing is baffled to eliminate unwanted reflections and increase contrast
• Very compact - just 2-7/8" long - easy to store and carry

• Handy and versatile wheel holds up to five 1.25" filters for visual and/or imaging use
• A huge time-saver for filtered planetary and lunar observation using different color filters, or for tri-color astrophotography pursuits
• Holds up to five 1.25" filters, or you can leave one space blank for unfiltered viewing
• Requires additional 20mm of focus travel - not recommended for use with Dobsonian reflectors
• Protects installed eyepiece or astrophotography filters from dust, dirt, and impact, and keeps them ready for action

• For observers viewing through a telescope from suburban or city skies, the Orion SkyGlow filter can significantly improve the quality of your view
• The SkyGlow filter enhances deep-sky observations in moderately light-polluted skies
• Broadband filter blocks the most common wavelengths of light pollution for increased contrast and better views
• SkyGlow eyepiece filters improve views of nebulas, galaxies as well as open and globular star clusters
• 1.25" filter with metal filter cell construction compatible with all 1.25" Orion telescope eyepieces and filter-threaded 1.25" accessories

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, this 25 mm Orion Sirius Plossl Telescope Eyepiece provides extremely sharp images of impressively high contrast. It's 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 and bright views. 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 25 mm eyepiece excels for moderately low power scanning of open star clusters and viewing of extended nebulas and larger galaxies.

• Adjustable length adapter lets you attach a T-ring equipped DSLR or SLR camera directly to your telescope
• Useful for either prime-focus or eyepiece-projection astrophotography with refractors or reflector telescopes
• Slides into 1.25" telescope focuser or 2" focuser with step-down adapter; has T-threads for attachment of camera body
• Allows you to vary the magnification without changing the inserted eyepiece when performing eyepiece projection astrophotography
• Requires T-ring to fit your brand of camera (T-rings sold separately)