Here is a first effort with my new 500 f4 lens.

It was a good test because of the poor lighting presented before me at the end of the day and with light blocked by high trees. I would not have achieved this result with my beloved 400 5.6. The stabilized f4 made the difference.

I like the result, the image evokes a greater feeling for me than if it was taken in full direct sun light.

With ducklings and other water fowl, the trick is to get as low as you can so that you are at their level. Here, I was flat on my belly at the edge of the water, with the lens and camera hand-held and lens plate practically on the ground.

Canon 50D with 500 f4 lens @ 1/400, f4, ISO 400 cropped for composition.

Cheers,

Mike