|
The cheshire is basically a sight tube fitted with cross hairs.
Looking into the sight tube you can see the line up of the optics.
eg. the bottom of the focuser,the secondary mirror,the primary mirror and the reflections of those. Line all these up and your sweet. The crosshairs show you the centre point of the focuser compared to the optics and their reflections.
Easy hey!
For 90-95% of collimation it's great. Getting the last 5-10% thats the tricky bit.
Slice
|