Astromania 1.25 Inch Telescope Eyepiece Parfocal Rings Set of Three Aluminum Alloy Universal Accessories Kit for Astrophotography & Planetary Observation

Adjust the Focusing Ring for Precise Calibration: When changing the 1.25 inch eyepiece of the telescope; refocusing is not required; enabling rapid switching; maintain sharp focus for planetary observation and astrophotography All-Aluminum metal Construction: It is treated with black anodic oxidation; featuring excellent wear resistance and a long service life; precisely processed to ensure compatibility with a variety of telescope eyepieces Easily Increase Magnification: With parfocal ring equipped telescope eyepieces you can change magnifications quickly and easily; this set of three Astromania parfocal rings lets you make more efficient observing Dual-Purpose Calibration System: It is not only useful for focusing in the eyepiece of a telescope; but also for setting the focus position of a calibration eyepiece used to focus an imaging or guiding camera A Complete Set of Tools: Includes 1.25 Inch Telescope Eyepiece Parfocal Rings Set of Three and wrench for adjustment; essential telescope accessories for deep-sky photography