What many photographers don't understand is that the aperture of the lens remains wide open until the moment the shutter button is pressed. Editor's Tip: Ready to go on a photography adventure, but not sure where to go? Learn why the Pacific Northwest is a photographer's playground. The darker view results from the camera closing down the aperture to the setting that you've selected, and in doing so, the view through the viewfinder allows you to see the depth of field you would get in the image if you used that specific aperture. If you look through your viewfinder while pressing the button, you'll see that the view gets darker. However, if you use a smaller aperture and then press the depth of field preview button, you'll hear a sound coming from the camera. In the video above, ZY Productions offers a quick tutorial on what that button - the depth of field preview button - does.Īs explained in the video, if you have the aperture set to the maximum aperture value of the lens, the button won't do a thing. Well, believe it or not, that little button actually performs a very valuable function, one that could help you take better photos. I mean, if you push it, nothing happens, right? Have you ever wondered what in the world that button on the front of your camera near the lens housing does?
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