dmwierz Offline Dedicated FM Upload & Sell: On
|
p.1 #25 · Baseball: Working for the tack sharp shot | |
Dann,
Note Scott's statement:
"With regard to DOF and "compression", there are many factors that play into this, most of which have been discussed recently in another thread"
And look at the background in the shot he posted. There is a lot of "air" behind the pitcher so even at f/5.6 your BG is going to be very nicely blurred.
But even in "closer quarters" stopping down won't necessarily ruin your bokeh. Changing your aperture from f/2.8 to f/5.6 represents a move of 2 stops, which is a 4X decrease in light transmission into the camera (1/4 the amount of light gets through to the sensor), but it only increases the DOF by a factor of 2, not 4.
For example, shooting a 300mm lens across the diamond, say to catch a play at third base, taken from the first base side (approximately 150 feet distance from where we've been allowed to stand), would only open up the DOF from around 10 feet to 20 feet (10 feet in front of and 10 feet behind the base). Even the smallest of fields will have a lot more than 10 feet behind third base before you run into "junk" (like fences, etc). The junk in the background might not be quite as smoothly blurred as it would be at f/2.8, and it won't be as smooth as it is in the shot Scott posted above (where the background is far in the distance), but what you lose in bokeh blur will frequently be more than made up for by increased sharpness of the image.
Like Scott said,
"I'm not sure one would really notice much difference if it had been shot at f2.8"
Edited on Mar 30, 2008 at 07:49 PM
|