Astromania 2 Inch Telescope Eyepiece Parfocal Rings Set of Two — Open-Box, 25% Off

Adjust the Focusing Ring for Precise Calibration: When changing the 2 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 two 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 2 inch telescope eyepiece parfocal rings set of two and wrench for adjustment; essential telescope accessories for deep-sky photography

These rings provide the ideal solution. They are made of precision machined aluminium with black anodizing. An Allen key & wrench to adjust position is included. They are also extremely useful when used with a flip mirror or beam splitter for photography. To use a par focal ring with a flip mirror you would first use the telescope's focuser to put your attached camera in perfect focus, now slide a ring over the eyepiece of your choice and raise and lower the eyepiece in the holder until it is perfectly in focus. Once you find the focus point that is perfectly matched to the camera slip the ring down and lock it in place using the included wrench. Now you can focus using the eyepiece . This is much easier than a dim focus screen. You just flip the mirror and take a picture! Leave the ring in place on the eyepiece and you can always quickly and easily pop it back in for photography.