Bird Watching: Bird Watching: "On the Waterfront" - Part 5, 0 by linthicum

linthicum wrote:
Mrs. Ed, it is ...... AF-S Nikkor 500mm f/4D IF-ED II lens. Nikon has since come out with one that has vibration reduction. Mine does not have the image stabilzation feature. However, I, for the most part, only ever use it on a tripod. This is what Nikon says about the technology that drives the auto-focus.

"The Nikon Silent Wave Motor (SWM) uses ultrasonic traveling waves, converted to rotational energy, to focus AF-S NIKKOR lenses. The ultrasonic waves, moving in a spiral pattern inside the lens barrel, drive the cylindrical motor that moves the lens elements. This powerful and responsive high-torque motor system provides instant startup, high-speed autofocusing and incredible accuracy. Conventional autofocus lenses are driven by a motor in the camera linked to the lens by a gear system. Using inaudible ultrasonic frequencies—in effect, ultrasonic vibrations—rather than a gear system results in incredibly smooth, silent and precise AF operation".

Here's a male 'Eastern Towee", stationary subject, with the same lens, that I took on Monday.