I recently took a picture of this bird flying around Geneva, Switzerland:
In the beginning, and because it was bright and the subject was against the light, I though it was simply another Buteo buteo as there are many around here. Now by tweaking the brightness and contrast a bit in Lightroom, I can be 99% sure that it is not a Buteo buteo and my mind goes more to a Pernis apivorus, which is another bird of prey present in the region in summertime (May-Sep).
Can anyone tell me if I am correct and what field marks can be deduced from my picture to be sure that it is the right bird?