Author 'Boucher Marc dit de Meilh' (Id 128930 ) : I think a great tit sustain themselves on the big branch from above the tree border fence ... So is the name of the place in which it was taken. Taken Minolta AF 100-300 mm which is a little mischief in chromatic aberration '... These aberrations can be observed on thin branches blurred: instead of being dark, they are rather 'blue or violet. " Chromatic aberration is corrected well with software. It is best to have good optics. Marc Boucher said Meilhan. : 19: