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Clear night last night (well clearish anyways!). I have been pleased overall with the views from this scope, but it is obvious that at f4 collimation becomes a little more critical even for visual use.
So I decided to do a collimation setup from scratch. Centre spotted the secondary (didn't bother with offset as my calculations showed that the amount would be less than the size of the spot anyways!) and then worked through a sight tube, cheshire andfinally the auto collimator. All these tools are old Techron ones. I hadn't used the auto collimator before but it made a difference when doing the final tweak.
Images were noticeably sharper in the inner part of the FOV when I tested it outside which was really pleasing. Looks like it may be a really nice night here tonight so I will have another go then.
Malcolm
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