I've just gone back and checked my previous posting and reached a subjective conclusion that the seeing conditions play a big part in the clarity of the triangles, (will check by experimenting). With your image triangles they appear to be all pointing outwards (?) the closer you get to focus, with mine thay appear to be pointing inwards, yet we end up with the same pocal image.
Unfortuantely I've deleted the original avis and stills so I'll hopefully do a few tonight (#@%& weather permitted) and get back with the results
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