Canon’s 100mm – 400mm lens

I’ve been using Canon’s f/4.5-5.6 L USM IS lens since June and I must say I’m very happy with it. It certainly takes time to learn since I have no super-telephoto experience. It’s heavy; with the camera it weights about 5 pounds. Nevertheless, even with my slender build, a 3 or 4 hour foray into the field doesn’t seem to pose neck strain, though tripod breaks definitely help.

Although the USM autofocus is very quick, it’s not so effective when photographing birds where there are often leaves or branches in front of or behind the subject, often resulting in an out-of-focus bird. Manual focus seems to be the better alternative under these conditions. When extended to greater magnification, the image stabilization feature helps but you really need to brace the camera against something solid if you’re shooting at less than 1/800 of a second, otherwise the image will not be sharp. As always, it’s important to know your subject so you can be in position with the necessary camera settings to get the best shots. (More photos at: http://sfielding.photoshop.com)

My next challenge will be to capture landscapes with a compressed effect that cannot be done with a shorter lens.

Author: Stephen Fielding Images

I'm a retired medical sociologist from the University of Rochester. My publishing experience includes a wide variety of academic articles and a book, "The Practice of Uncertainty" (1999). The mission of my blog is to provide accounts of the natural environment, including photos, in order to raise awareness of its fragility and the impact of climate change. Climate change is the greatest challenge currently faced by humanity. I occasionally write about the impact of climate change using the principles of social scientific writing. To do this I read reputable books and articles on the topic. So when I make statements about climate change you will see a link taking you to the scientific source(s) of the information I provide. As for my independently published photobooks, each has gone through several layers of editing and peer review for both readability and accuracy. This is not to say that everything I say is accurate. Even the New York Times makes mistakes. So, if you find something that is factually incorrect, let me know. I hope you find reading my blog a positive experience. If you do, please encourage your family and friends to have a look. Best wishes, -Steve

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