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F/4 Collimation

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Posted by Greg Eckes on October 31, 2003 04:18:48 UTC

Jarvis,

Tahnks for the reply. I would love to see some photos of your scope. I was thinking about rebuilding my scope as you suggested. I have the red tube.

My collimation story is to long to write here but in a nut shell. When I look through the eyepiece down the tube the diagonal is not concentric with the focusing tube. The reflection from the secondary (highest point of the diagonal)touches the right side of the tube. The lowest end is not equal distance. it appears to be farther to the right. I moved the secondary forward and drilled new holes. I got the secondary to look correct but the reflection on the focuser was never centered in all the other reflections. I used the scope but found the imagers lacking. The next day I moved the secondary back to the original spot and some how all the reflections line up perfectly. The image is great. The only problem seems to be the the secondary is again not concentric or equal distant as seen in through the focuser. I am just wondering how much light I am loosing if it is being cut off by the focusing tube. I hope you can understan this. Is you secondary centered in the focuser and is you secondary centered in the main tube or off set (lowered) slightly?

Greg

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