The f-number directly affects the depth of field in your shot. It’s also one of the three exposure controls, in conjunction with shutter speed and ISO. Based on our previous polls, I see that most of us are using a dSLR in aperture priority mode, so I’d expect that most of us have a “favorite” number or range of numbers. Personally, I favor F/2.0 on a ~50mm lens on a full frame camera. The DOF isn’t as crazy-shallow as F/1.4, but it still gives a nice amount of separation between background and subject at the distances I’m used to shooting at.
Now, I realize that your choice of f-number will vary depending on focal length, sensor/film format, subject distance, and subject matter. But try to answer the poll with the number that you usually gravitate toward. And feel free to elaborate in the comments!
And be sure to check out the last poll on the topic of “Why Are We So Compelled?” Lots of good thoughtful discussion there with 27 comments (and a few of them are quite lengthy)! As always, I appreciate the participation in these polls and discussions.