Is Depth Of Field Affected By Focal Length? A Practical Test

The fact that the depth of field varies depending on focal length seems pretty straightforward, doesn’t it? Matt Granger however says that wide angle lenses don’t necessarily have a smaller depth of field when compared to longer telephoto lenses:

To understand any of this, you have to know what depth of field is: (Yes, this is very basic) Depth of field is basically the depth of your image that is in sharp focus, it is usually about 1/3 in front of your focus and 2/3 behind it.

In his video, Matt conducts a test to prove his point: He takes the same shot with the same framing and only changes the focal length and the position of the camera. The aperture was kept the same – f/2.8 – throughout the shoot. Of course when changing the focal length of your lens you’ll have to physically move the camera if you want your final result to have the same crop.

Here are the results:

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The Ultimate Guide To Managing Batteries On Location

The Ultimate Guide To Managing Batteries On LocationIf you’re using strobes, pocket wizards, remotes, or RC cars, you are probably using AA batteries. Those are small little wonders of energy.

Here is the big question, how do you manage them on location? How do you keep the loaded batteries ready for grab?

How do you make sure the empty ones get enough charge?

How do you sleep at night knowing that a battery may stop working at any given time?

Good questions! Benny Johansson, AKA Benvelo created a full system just for that and guess what? It is graphically rocking. [Read more...]