Telescopes & Astronomy

The Sirius Optics Cheshire Collimator Long is a precision 1.25" collimating eyepiece designed to help you achieve perfect optical alignment on both refractor and Newtonian reflector telescopes. Featuring an angled reflective surface with a central sight hole and an integrated crosshair for added accuracy, it makes collimation straightforward and reliable. A comfortable rubber eyeshield ensures ease of use during extended adjustment sessions.

M42 x 0.75mm Aluminium Alloy Extension Spacer Ring for telescope photography. This 3mm spacer can help you achieve precise back-focus spacing in your imaging train.

• Power your Celestron computerized telescope from your car battery or a portable 12V DC power supply.
• Barrel connector plugs into the 12V input jack on the telescope drive base.
• Power connector fits standard automobile cigarette lighter receptacles, also found on portable 12V battery packs like the Celestron PowerTank.
• 25-foot cord for lots of reach.

• A great accessory for daytime terrestrial viewing with your telescope
• This 1.25” diagonal produces right side up and left-to-right correct images when used with refractors and catadioptric (Schmidt-Cassegrain) telescopes
• Inserts into 1.25” focusers or visual backs; accepts standard 1.25” eyepieces

The Sirius Optics 15mm 68° WALER eyepiece delivers a wide-angle field of view with generous long eye relief, making it ideal for comfortable extended viewing sessions—especially for eyeglass wearers. Enjoy sharp, immersive views without the eye placement sensitivity common in shorter focal length designs.

Sirius Optics 20mm 68 Degree Long Eye Relief Eyepiece

Getting your back-focus distance right is essential for sharp, well-corrected astrophotography and sometimes you need more than thin shims to bridge the gap. This M48 x 0.75mm aluminium alloy spacer ring provides 30mm of solid, threaded spacing to help you build out your imaging train with precision. Also available in various sizes to suit your specific setup requirements.

Wide dovetail bar to fit CGE or Losmandy style saddles

• Dovetail bar connects to the top of the Rowe-Ackermann Schmidt Astrograph 8" to attach accessories to the optical tube.
• Dovetail bar is the same as the bar on the bottom of the RASA 8" optical tube.
• Aluminum body provides a sturdy platform for accessories, matches the dovetail mounting bar on the RASA 8".
• Installs easily into existing threaded holes in the RASA 8" and comes with all mounting hardware required.
• Accepts accessories that can mount onto CGE or Losmandy-D dovetail plates.