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Five cornerstones of equivalence in photography
By James Wei of roentarre
The Five Cornerstones of Equivalence When it comes to using the concept of equivalence to make sure you're fairly comparing camera systems that might have different image sensors, there are five areas that you'll want to concentrate on; the depth of field, the framing of your picture, the perspective of the photo, the shutter speed you use and size of the output file. Of course, there's a lot more to know about each of these five areas, information we'll go into below. Depth of Field Depth of field simple refers to the amount of the subject that is in focus in a photograph. The aperture setting on a camera with a larger size image sensor can be changed so that equivalence can be used to compare it with a camera with a smaller image sensor while maintaining the same Depth of Field. On the other hand, if the f-ratio is set the same on both cameras, the depth of field is going to be different, which means the comparison isn't using equivalence. Perspective Perspective refers to the distance between the camera (roughly) and the subject of the photography. If you're more specific, it refers to the distance between the aperture and the subject, but there's only a little difference in different types of cameras. By making sure to use the same perspective when comparing digital cameras, you can be on your way to using equivalence to get the most accurate comparison of camera equipment. Framing Framing refers to the field of view (FOV) or the composition of the photograph, everything you can see. In film this is referred to as mise-en-scene. In photography, however, it also plays a big role in making sure equivalence is used when comparing cameras that may have different image sensors. In addition to the FOV, the angle of view (AOV) is also important. The FOV refers to the width and height of the total area of the photograph on the focal plane, while the AOV refers to the angle of the photograph when compared to the focal plane. Both of these are used in equivalence to make sure a comparison between different camera equipment is fair. Shutter Speed Shutter speed is the amount of time that the shutter opens to allow light to hit the image sensor. Shutter speed has a big effect on the photograph especially if the subject is moving. By adjusting the shutter speed, a photographer can account for motion blur normally caused by a moving subject. Using the same shutter speed to compare photos from different cameras is one of the cornerstones of equivalence. Output Size When using equivalence, the output size of the photograph is the last item that should be the same when comparing photographs. This really comes into effect when you're trying to compare two cameras with different pixel resolutions. For example, trying to compare a 10 MP camera and a 21 MP camera. The best way to make sure equivalence is used is to use the output size of the photo and keep the number of pixels used the same on both cameras. Typically, this will mean shooting or using images at a smaller than possible setting for the camera with more pixels. Regards James Wei |
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