Feature
●Eliminate the need to make focus adjustments when changing telescope eyepieces.
●Also useful for setting focus point of calibration eyepiece used for focusing an imaging or guide camera.
●With parfocal ring equipped telescope eyepieces you can change magnifications quickly and easily.
●"They are made of precision machined aluminium with black anodizing. "
●This set of 3 Alstar Parfocal Rings lets you make a set of non-parfocal 1.25" telescope eyepieces parfocal for more efficient observing.
Description
These rings provide the ideal solution. An Allen key to adjust position is included. They are also extremely useful when used with a flip mirror or beam splitter for photography. Also useful for setting focus point of calibration eyepiece used for focusing an imaging or guide camera.
To use a par focal ring with a flip mirror you would first use the telescopes 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. Leave the ring in place on the eyepiece and you can always quickly and easily pop it back in for photography.
Features of Alstar 2" Parfocal Telescope Eyepiece Rings
High-quality Metal Aluminum
They are made of precision processed metal aluminum and treated with black anodizing. They are not only light in weight, but also firm and durable.
Easy to Use
With the eyepiece parfocal rings you can quickly change the magnification without adjusting the focal length when changing the telescope eyepiece.
Combined Use
This set of 3 Alstar Parfocal Rings lets you make a set of non-parfocal 1.25" telescope eyepieces parfocal for more efficient observing.
