Squirrel for shooting exercises

Visited my mother today. My father made a sort of picknick table for squirrels in one of the trees in the garden. Actually, I have to say; a picknick table for the birds, but the quirrels confiscated this table more or less. This squirrel went for a drink after lunch (also meant for birds) and gave me a nice opportunity to test at which aperture my old new lens gives the most sharp pictures. This picture was taken from a distance of approx.10 meters with a FX camera, so no cropfactor. 300 mm is 300 mm with this camera and I must say that I am pretty satisfied with the result. Aperture was f 8 and I think that gives (so far) the best results.