.:tracking installation:.

Focus-gauge

This device measures the position of the mirror. The focus with eypieces and cameras are very different. So you have to turn the screw of the focus very much, but you don't know in which direction. The field of view on the camera is also not very large. So it is helpful, if you know at least that the focus is correct. With this gage you can center a star in the eypiece and screw the mirror to the exact focuspoint of the camera.