Products

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...

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

Use this female T-thread to male T-thread spacer to extend standard T-thread adapters by 16.5mm.

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...

Our kit of popular accessories for the ZWO Seestar S50 smart telescope includes a holder for using standard 2" (M48 thread) filters, a magnetic dew...

Available Now! Use 2" filters with your HAC125 DX! There are two parts to this filter holder.  There is a flange that threads onto the HAC125 in pl...

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...

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"...

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...

A portable guidebook for enjoying the night sky in 2025. 2025 Night Sky Almanac is the ideal resource for both novice and experienced sky watchers ...

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

  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 ...

M42 female to M42 male 4.5mm spacer.

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

A great accessory for daytime terrestrial viewing with your telescope This 1.25” diagonal produces right side up and left-to-right correct images...

Supplemental 5lb/2.25kg Counterweight for EXOS Mounts. Includes locking knob.