Sturdy aluminum alloy build Made from aluminum alloy, this collimator provides durable, reliable performance for telescope alignment tasks. Compatibility and design Compatible with 25 inch telescopes and tailored for 1.25 inch telescope systems, it is an indispensable tool for amateur astronomers seeking to elevate their observing skills. Precise optical alignment Designed to calibrate the optical axis of reflective telescopes, enabling precise alignment for clear stellar viewing. Enhanced image quality The integrated 45 degree plate significantly improves visual accuracy, allowing you to enjoy clearer images from different viewing angles. Use scenarios Before an observing session with a reflector telescope, use this collimator to ensure proper collimation for sharper stars. During astrophotography setup, align the optics precisely to optimize image sharpness and reduce distortions. In field use or outreach events, adjust viewing angle with the 45 degree plate for comfortable, clear demonstrations and viewing. Key specifications and attributes Material: aluminum alloy Function: optical axis calibration for reflective telescopes Compatibility: designed for 1.25 inch telescope systems; compatible with 25 inch telescopes Additional feature: integrated 45 degree plate for improved viewing angles