PIXPHATIC wrote in post #17381250
As mentioned by ebiggs - 'One thing, it is a lens you will have to learn to use. It is not the easiest one of the bunch. One things for sure it needs a lot of light to do it's best.'...........
There are really two kinds of light. As far as total light captured coming off the subject is concerned, the aperture is the sole determinant (from a given distance), regardless of focal length. So, as far as subject-level noise is concerned, the Tamron at 600mm outperforms any 400/5.6 lens or any 500mm f/6.3 lens. However, the f-stop is the main determinant of AF speed and accuracy, regardless of focal length and magnification, or total subject light collected.
Yeah more or less yes.
Just try to keep it @ f7.1or f8.Never go beyond 540mm-550mm.
AF is snappier going from close to far, or far to close, when you limit the focal length to about 530, but you get the most light from the subject at 600mm (from a given distance), because the aperture is largest at 600mm.