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As promised some pictures of the lens elements from the TOA 130 during the collimation exercise.
Basically shows the system exposed with the lens hood removed.
The front element has a ring of plastic tape around its circumference making an air/dust seal between it and the second element.
Can see down the throat of the OTA.
Can see the assembly in a couple of angles, and with the front element removed.
Also looking into the scope with a Howie Glatter laser collimator inserted. Trying only to show what is reflected back onto the collimator face.
One pic has two obvious reflections, one brighter than the other. At that stage, the airy disc patterns looked quite acceptable, and the ‘live ‘ test produced good stars, . I could separate a 2arc second double. I couldn’t see any colour fringing on the edges of the moon.
After removal of the assembly and replacing only the centre element for alignment firstly, and then without changing the alignment positions for the inner elements, replace all the elements and re-tweaked the front element for good airy Discs again, I got the second Howie Glatter picture. The Brighter of the two earlier reflections is now almost spot on the centre. There is still another (in real life much fainter) dot visible.
But in actual viewing, i cannot really notice a difference after my second attempt. Everything seems to be quite OK still.
I’ll stew on it for a few months, but I think I’ll be happy with it.
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