Parfocal Rings for 1.25-inch Eyepieces - Set of 4
Parfocalising Rings for 1.25" Eyepieces
Parfocalizing Rings are being used for several purposes.
If you would like to match the focal position of each of your eyepieces or to mathc it with your digital camera, so that you won't have to refocus when swapping them, you would need few of these parfocalising rings...
In this set there are four parfocal rings.