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Eric, follow these steps:
1- Using the TeleCat, adjust the secondary mirror until it is round and centered as seen from the Telecat pupil. For added accuracy, you can change the length of the Telecat to match the F-ratio of your scope but if this is somewhat confusing then just shorten the tube all the way and use.
2- Continue with adjusting the secondary mirror until the center triangle perforation reflection is aligned with the cross-hairs of the TeleCat.
3- Adjust the primary mirror until the triangle reflection is aligned with the Telecat’s ring reflection.
To fine tune your collimation, continue with the following steps
4- Insert the autocollimator and fine tune the secondary mirror to stack all 4 reflections. When that happens, you should see a single triangle reflection -- not a hexagon.
5- Re-insert the Telecat and fine tune the primary mirror to align the triangle reflection with the Telecat ring reflection
6- Reiterate between steps 4 and 5 until both the Telecat and the autocollimator agree.
Does your autocollimator include a single or dual pupils?
Jason
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