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Thank you, Tony and Ectemnius,
I did not find any pictures with such wing clouding near wing tip and all yellow legs, so I suspected a different species. I just looked on the photo in the above mentioned link, not the text. What a shame. It is indeed mentioning sexual dichroism regarding leg colour, the males with all yellow legs. In addition, the clouds at the apices of R2+3, R4+5 and M are more prominent in males. In other words, full match. And I realized that I have only looked on females on the net...

According to the Norwegian species recording system Artskart, there are six records between 1981-1995, and a female recorded by me in 2014 at the very same spot as the above specimen. I see that Fauna Europaea (Ozerov, 2013) does not list the species as Norwegian, which is an obvious mishap. The six first records are determined by Lita Greve Jensen and are in the collection of the Natural History Museum in Oslo.

Cheers Jørn