Best A Alstar in 2026

High quality optical Prism inside rather than a mirror which makes your image clear and sharp.

1.25" 45-degree mirror star diagonal for any telescope with 1.25" connector (not suitable for Newtonians).

More comfortable viewing orientation as you observe from above, filter thread for any 1.25" filter. Accepts standard 1.25" eyepieces.

Dual design allows the user to make slight magnification adjustments without having to change telescope eyepieces.

In addition, the adapter works well for refractor telescopes when in use for either prime-focus or telescope eyepiece-projection photography.

Compatible for both reflector and refractor telescopes with 1.25" eyepiece holders.

Wide 58- degree Field of View (FOV) in 2.5mm to 25mm focal lengths. Equipped with an eyepiece barrel which could be rotated for adjustment and a convertible rubber ring for eyes.

Designed primarily for planetary observation (Moon, Jupiter, Mars and Saturn and more) but great for deep sky objects too. Comfortable eye relief averaging 16mm across the series. Threaded for standard 1.25- inch astronomy filters.

1.25" fully multicoated eyepieces give maximum detail and definition across the entire 58 degree field of view. High transmittance and contrast ratio with least lateral chromatic aberration and scattering phenomenon.

Wide 90 degree angle: You can view correct image from refractor telescope stand and just look down with a comfortable angle.

Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser.

More comfortable viewing orientation as you observe from above, filter thread for any 1.25" filter. Accepts standard 1.25" eyepieces.

Ideal for custom installation of any finder scope, EZ Finder reflex sight, and Green Laser Pointer bracket on any telescope.

Made of high strength Aluminum with Anodizing Aluminium Process. Not intended for use on Schmidt-Cassegrain telescope optical tubes.

Drilled (but not threaded) to accommodate screws up to 4mm in diameter. Center-to-center screw hole spacing on your telescope must be 18.6mm (0.76") in order for this dovetail base to be compatible.

With two 32mm Plossl Eyepicecs which give the widest viewing field along with extra sharpness and long eye relief.

1.85x and 3x specially-designed Barlow Lens is included which effectively doubles the magnification of eyepieces used.

An excellent accessory which helps to reduce eyestrain. Eyepiece diopter scales for sharp focus.

The Alstar LRGB Filter Set includes four filters, 2" luminance Filter, 2" Red Filter, 2" Green Filter 2" Blue Filter.

Housing in a solid foam packing, together with plastic transparent case.

Combining separate astrophotographs taken through these LRGB filters produces finer resolution and amazing color.

You'll never go back to using just one finder scope again!

Attach two finder scopes or other aiming devices to your telescope quickly and easily.

Use any combination of two aiming devices you wish including finder scope, red-dot reflex sights, green laser pointer brackets, mini guide scopes, and more.

Having the right equipment to shoot art-gallery images of the heavens starts with the right telescope, camera and camera adapter, and ends here.

Inner ring can be rotated with a standard allen key (allen key provided) to ensure lens is always right way up.

All metal construction and anodizing aluminium process, durable for long time use.

【Eliminate Focusing Problem】The extension tube has a M48*0.75 interior thread and a M48*0.75 exterior thread, elegantly solves the spacing problems in astrophotography and eliminates a series of focusing problems.

【Variable Combination】 The required spacing can be achieved by combining several extenders of differing lengths,you can use 1 piece, 2 pieces , 3 pieces or 4 pieces of the extension rings as you like. Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners.

【Aluminium Alloy Material】High-quality all-metal construction and anodizing aluminium process, durable for long time use.

Finder projects a small red or green LED reticle pattern onto a viewing window so you can easily aim your telescope at night or during the day.

The Finder Deluxe is a non-magnifying reflex sight that makes aiming your telescope easier and more accurate than ever - day or night!

Includes dovetail finder bracket that fits most Orion telescopes. Requires CR-2032 lithium button-cell battery (Not Include).

A small red LED dot is projected onto a non-magnifying viewing window so you can aim the main telescope quickly and easily.

Thumbwheels allow positioning of the red dot horizontally and vertically for precise telescope alignment.

Includes bracket that fits the dovetail mounting base on many telescopes.

Have a built-in worm-focuser with Brass Compression Ring and 2 thumbscrews,48mm focusing range (10mm focusing range with micro-focusing Helical focuser, the rest is by a fixable, scaled drawtube) is made possible by an extremely precise focus adjustment. The mechanism has a determined orientation: This is mounted cameras or eyepieces - and thus also the area with your guide stars - not rotate during focusing.

Adjustable-aim dovany weight to an astrophotography setup and can conveniently be stashed in an accessory case between uses. "etail guide scope bracket installs on virtually any astrophotography telescope quickly and easily.

240mm focal length. Compact mini guide scope designed for use with astrophotography telescopes up to 1500mm focal length. With bright, wide-field optics puts numerous potential guide stars in view so you'll never have to search for one!

Dielectric coatings; super flat mirror with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing

1.25 inches nosepiece fits 1.25 inches telescopes; accepts standard 1.25in filters; eyepieces; Barlow lenses and other accessories with a 1.25in insert barrel

90 degree viewing angle; diagonal reflects the telescope’s light path 90 degree to provide a more comfortable viewing angle; best for observing objects overhead

"cipa 49002 wedge 1.5"" x 2"" stick-on convex hotspot mirror"

no drilling required for easy installation

clam shell design accommodates most windshield trim sizes and shapes

High-quality prism diagonal provides a comfortable and sharp 45 degree viewing orientation for great daytime terrestrial views and night time astronomy applications for telescopes

High optical lens transparency;the large quality prism allows more light transmission;so that delievers a clear image

Standard 1.25 " diameter for filter thread for any 1.25" filter;fits for the standard 1.25" telescope eyepiece

High quality optical Prism inside rather than a mirror which makes your image clear and sharp.

1.25" 45-degree mirror star diagonal for any telescope with 1.25" connector (not suitable for Newtonians).

More comfortable viewing orientation as you observe from above, filter thread for any 1.25" filter. Accepts standard 1.25" eyepieces.

Wide 90 degree angle: You can view correct image from refractor telescope stand and just look down with a comfortable angle.

Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser.

More comfortable viewing orientation as you observe from above, filter thread for any 1.25" filter. Accepts standard 1.25" eyepieces.

2" Diagonal Mirror with 99% reflection, optics are made with Pyrex glass.

Multi-layered dielectric coatings that produce 99-percent reflectivity for brighter, sharper images.

Comes with dielectric coatings for the most light transmission possible.

This diagonal can correct upside down and left-right reversed image easily, which allows you view things during daytime in correct position.

Fits for 1.25inch telescope eyepiece and focuser. Work with Refractor and catadioptric telescopes. Plastic body with optical glass lens, providing clear and sharp image.

Wide 45 degree angle makes you view correct image from refractor telescope stand and just look down with a comfortable angle.

【360 Degree Rotatable and Magnetic Adjustable】: Our coffee reflector is magnetically adjustable. It attaches to the ball head and rotates 360 degrees, allowing you to easily adjust and monitor your shots.

【Better Viewing Angle】: Coffee flow rate observation reflective mirror provides a better view, monitoring the perfect extraction can definitely enhance your coffee making experience.

【Easy Observation】: Coffee shot mirror for bottomless portafilter makes it easier and simpler to monitor your coffee from your bare hand filter.

【360 Degree Rotatable and Magnetic Adjustable】: Our coffee reflector is magnetically adjustable. It attaches to the ball head and rotates 360 degrees, allowing you to easily adjust and monitor your shots.

【Better Viewing Angle】: Coffee flow rate observation reflective mirror provides a better view, monitoring the perfect extraction can definitely enhance your coffee making experience.

【Easy Observation】: Coffee shot mirror for bottomless portafilter makes it easier and simpler to monitor your coffee from your bare hand filter.

All-surface multilayer coated prism system. Not recommended for use in reflective telescopes.

Used for 1.25 inch focus seat and 1.25inch eyepiece.

Constructed with aluminum alloy housing and stainless steel cover plate, available for long lifespan.