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I did have a problem with the dovetail and it flipped out of the mount. Fortunately no damage was done. I then looked closely at the dovetail. You have to centre it carefully in on the mount as it has only about 1cm of movement up or down before it loses it's grip.
On a better note I took more pics last night. I focussed carefully and "NO PURPLE HALO.
The pics are of M16 taken with an unmodded 40D. 7x 5 mins, darks, flats etc processed with Iris.
The bigger image is full frame at 50x80arcmins. The smaller one is a crop from the centre.
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