Possibly a Bridled Titmouse

We seldom see these at the feeder and a small flock stopped here today. They didn't stay long as they prefer the high country and the California coast.
The lens has a 2x multiplier so as to "act" like a 400mm or a 640mm on this crop sensor camera. The multiplier really sacrifices the quality of the image. One day I'll have a "real" telephoto.