So, this serves as a “little” addition to last night’s post about blur. Here, I’m focusing specifically on the effect of aperture on background blur. Remember that the same idea applies to foreground blur, as well.
I put together this little animation to demonstrate the effects of aperture changes, as well as how I compensated for the changes in light.
Notice that, aside from the first change, each change in aperture requires half as much time to compensate in light (that’s called a stop, again, another blog). Also, notice how the foreground plant stays sharp throughout, the mid ground plant comes into focus around f/8, and the log in the background isn’t really sharp until f/22.
The foreground plant was about 2 feet (0.7m) in front of me, the midground plant about 3 feet (1m) in front of me, and the log laying behind them something like 8-10 feet (3m) back.
In the next animation, you’ll see what happens when you don’t compensate for the change in aperture.
It got so much darker that I had to add a box to make sure the text was legible… Which I probably should have done for the first animation…