Every image you make involves decisions – you decide how to expose. Aperture, shutter, and ISO.

Cats – f/2.8, 1/125th sec, 1600 ISO (45mm)

The first decision here was f/2.8, to allow in enough light and to get selective depth of field. Then I needed a fast enough shutter speed, and that led to the 1600 ISO.

Cats – f/4, 1/200th sec, 1600 ISO (45mm)

The first decision here was f/4, to get a little more depth of field. Then I needed a fast enough shutter speed, and that led to the 1600 ISO.

And finally, one more cat:

Cats – f/2.8, 1/60th sec, 1600 ISO (45mm)

This time, I lowered the shutter speed, because I did not want to go beyond 1600 ISO.

So as you see, every snap involves decisions; deliberate decisions about aperture, shutter and ISO, that make your picture into what it is.

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