Products

The 0.75x reducer can bring Askar 91F's focal ratio down to F5, providing not only a faster focal ratio but also built-in field-flattening correcti...

Use this adapter to connect a T-ring or T-mount camera to a 1.25" focuser. Low profile design keeps backfocus short. Threaded for standard 1.25" fi...

The night sky is full of amazing things, but how do you know what you're looking at or how to get the best view? 100 Things to See in the Night Sky...

10GB Ethernet Adapters.  Options include: PCIe card for desktop or server computers with available PCIe slots. Thunderbolt adapter for computers w...

Why a 1600GTO? Thirty plus years of mount design and building expertise has been employed to engineer and manufacture our new 1600GTO mount into th...

Why a 1600GTO? Thirty plus years of mount design and building expertise has been employed to engineer and manufacture our new 1600GTO mount into th...

Why a 1600GTO? Thirty plus years of mount design and building expertise has been employed to engineer and manufacture our new 1600GTO mount into th...

This replacement adapter came with the original Starizona RASA8 Filter Slider converting the bottom M48 to M42 and adding 1mm to the Filter Slider ...

Replacement 2" holder for Quattro focusers that features a brass clamp ring and much tighter inside diameter tolerance to better hold imaging acces...

Compatible with the original S50, not the S50 Pro Our kit of popular accessories for the ZWO Seestar S50 smart telescope includes a holder for usin...

IMPORTANT NOTE!  We have recently found that Sky-Watcher has been cementing the 1.25" ring on some HAC125s that needs to be removed to use our filt...

This adapter threads into the front (telescope side) threads of the SkyWatcher EvoStar ED focal reducer, allowing the reducer to be placed directly...

The Celestron 2” to 1.25” Adapter with Twist-Lock was designed for visual observers who use both 2” and 1.25” eyepieces regularly and need a quick...

Easily use standard 1.25" eyepieces and accessories in a 2" telescope focuser, diagonal, or visual back with this precision-machined aluminum adapt...

This filter step ring is made specifically with the Starizona Filter Slider system in mind. It is zero profile, adding no extra height to the 1.25"...

Use this visual back to attach a 2" diagonal or other 2" accessories to the back of a Schmidt-Cassegrain telescope using the standard 2"-24tpi thre...

Helps to obtain the correct backfocus for your viewing needs. Made for use with 2-inch (50.8mm) telescope eyepieces with M48 mounted filter threads...

Introducing Celestron's new 2" XLT Diagonal. This high quality multi-coated mirror diagonal allows you to take advantage of the wider field of view...

Astronomy’s Deep Space Mysteries calendar is back for 2026! The world's best-selling astronomy magazine brings you a calendar filled with stunning ...

This guide scope features a 30mm aperture and an f/4 focal ratio with a helical focuser. Lightweight and durable due to the aluminum construction, ...

  Omni eyepieces offer a quality 4-element Plössl optical design at a super affordable price Rubber eyecups provide comfort and increase contrast....

THE AMATEUR STARGAZER'S ULTIMATE HOME COMPANION 365 Starry Nights is a unique and fascinating introduction to astronomy designed to give you a comp...

This adapter adds 4.2mm to your Starizona Filter Slider making it 21.7mm in total length, compensating for the .7mm that a standard Filter adds to ...