I put my new Canon 70-200mm f4/L lens to work today in the back yard. I had just refilled the bird feeders and thrown some feed on the ground, so the activity was very high, especially amongst the squirrels. This gave me a perfect opportunity to practice using the lens.

Backyard Squirrel, f4 @ 1/500, ISO 400 [bigger]

Backyard Squirrel, f6.3 @ 1/500, ISO 400 [bigger]

Both shots show off the decent-to-neutral bokeh that the lens provides fully open (not as nice as a faster 'L' lens, but this lens costs less than half the f2.8 version, and weighs a lot less, too!). The shots also show off the sharpness of the lens (the second one especially so, I think). I used Apple Aperture to "process" the photos. I did a bit of levels adjusting, but no additional sharpening.