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Rolf, i am hoping it is a simple fix, like your filter.
i have a similar artifact appearing in a Vixen VMC110 when I throw a star out of focus for collimating. It is not as numerous as the ones you display, but still annoying.
I have ended up doing a very close inspection on the primary mirror and found a worryingly large number of very, very fine pinholes in the mirror coating with some large enough to present an appearance of 'raindrop spattering' in the unfocused image.
As I said, I hope your problem is just a faulty filter.
Good Luck - Trevor
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