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.

• For 1.25" eyepieces

Enhances:

• Dust storms, surface plains and Maria on Mars
• Cloud belts, polar regions, loops, festoons, and ovals on Jupiter
• Cloud belts and polar regions on Saturn

Enhances:

• Lunar detail
• Polar ice caps of Mars in large telescopes
• Polar regions on Saturn
• Limb hazes and terminator clouds of Mars
• Clouds and atmospheric haze on Venus, reduces glare

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.

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.