This Orion 1.25" Twist lock Dielected Mirror Star Diagonal uses a 1.25" barrel, and can accept 1.25" eyepieces and accessories. The twist-tight lock feature will lock down your eyepieces, which means no more thumb screws scratching your eyepieces.
Diagonal Barrel Size
1.25", 90-degree mirror diagonal features sophisticated dielectric coatings with highly efficient 99% reflectivity for peak performance
Twist-tight clamping mechanism grips inserted eyepieces more securely than typical thumbscrew-equipped diagonals - without scratching!
Durable dielectric mirror coatings provide higher reflectivity for maximum brightness and contrast
Machined and anodized aluminum housing features machine-threaded glare baffles to eliminate glare for great performance
Nosepiece barrel threaded to accept 1.25" Orion filters