How to Calculate Aperture Diameter

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Calculating an aperture diameter requires you to divide your focal length by the F stop you're using. Calculate an aperture diameter with help from a director of photography in this free video clip.

Part of the Video Series: Photography Basics
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Video Transcript

Hi. I'm Dan Reinecke with Unknown Media. Today I'm going to talk to you about how to calculate your aperture diameter. Now, all your aperture diameter is, is going to be the focal length of your lens divided by the F stop. So this lens for instance is a 200 millimeter. If my F stop is going to be a 4, you have 200 which is the focal length of the lens divided by 4 which is my F stop. So with that you get 50. Now what is the 50? The 50 is the diameter of the aperture. So, all it is is a little equation and what it is going to be is the focal length of your lens divided by your F stop. That will be the diameter of your aperture. I'm Dan Reinecke, take your best shot.

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