Alright dads it is time to talk photography. Depth of field is a photographic term that describes how much of an image is in focus. Here is a visual representation of DOF. I decided to use some beer bottles to help illustrate my point. So kick back grab a beer and enjoy! You might just learn something about photography.
f32 aka a ton of DOF. The thing to remember though is that on 35mm format this photo is “diffraction limited”
f22 Welcome to the land of deep depth of field. Diffraction starts to take a real toll on image quality here.
f16 This image has a lot of DOF. However you can start to see a little fuzzyness on the last bottle.
f11 this is a pretty common apperture to use for shooting product. You are starting to reach the point where diffraction can limit image resolution. The last bottle is a little fuzzy and the second to last bottle starts to go out of focus too.
f8. The old saying in photography is f8 and be there. The first two bottles are clearly focused. The last to are out of focus.
f5.6 this is a really common portrait apperture. The first bottle is super sharp. About as sharp as it can be with this lens.
f4 The bottles in back are starting to really read as out of focus.
f3.5 DOF is starting to get noticeably deeper.
f3.2 This is a narrow DOF and lenses are at sub optomial levels any narrower than this, but they are used for effect, and for speed.
f2.8 this is as fast as most zooms get. You can nail sharpness still, but it is not as sharp as f5.6 anywhere in the image.
f2.0 things in back are really out of focus now.
f1.8 This is about as narrow as DOF gets on most lenses.
So how do you translate this to taking pictures of your kids? The big take away is what aperture does. The aperture on the camera affects how much of the image is in focus.
Go take some pictures and report back…