The information provided by the comparison is really only useful if you are familiar with the characteristics of one of the cameras. It doesn’t tell you anything concrete about the camera that is right in front of you. Why? Because it is a relative term that is a comparison of one camera with one type of sensor to another camera with another type of sensor. I hate it when people start talking about crop factor. Why I Think Crop Factor is a Mostly Useless Term A smaller image circle means less glass, which means less materials, which means it’s cheaper and lighter. They do this to make the lenses more affordable and lighter. What the crop sensor lens is projecting onto the crop sensor has the same scale as the full frame lens, but the extra “wasted” space of a larger image circle isn’t being transmitted. Lenses designed for smaller sensor cameras make smaller image circles than ones designed for full frame cameras. The difference between full frame and crop sensor lenses is the size of the image circle created by the lens. So what then is the difference between a crop sensor lens and a full frame lens? 24mm is 24mm is 24mm no matter who made the lens and what camera or sensor its going to be paired with. Focal length is an expression of a physical measurement between the lens and the image sensor and does not change no matter what size image sensor the lens is designed for. I hear this argument frequently, but it is incorrect. Surely the design of these lenses eliminates the crop factor of the smaller sensor? So a 24mm crop sensor lens on a crop sensor camera will behave like a 24mm full frame lens on a full frame camera, right? Sigma’s 18-35mm and 50-100mm f/1.8 Art lenses are a great example. There are tons of lenses that are designed to be used exclusively with smaller sensor cameras. Most sensors of other sizes (1″, 2/3″, 1/3″, etc) are found in fixed lens cameras or broadcast cameras and don’t get brought up in discussions of crop factor too often. So on a Four Thirds camera, our 24mm lens would behave like a 48mm lens on a full frame camera. The crop factor of a Four Thirds sensor is roughly 2.0x when compared to a full frame camera. This sensor is most often found in cameras like the Panasonic GH4 and GH5. The most commonly referenced sensor size after APS-C/Super35 in terms of crop factor is the Four Thirds sensor. There are many other sensor sizes out there, each with a different crop factor. This results in a 24mm lens on a APS-C/Super35 camera behaving like a 35mm lens would on a full frame camera. For example, the most common crop factor talked about is that of APS-C or Super35 sensors, which have crop factors of 1.5x or 1.6x depending on manufacturer. Essentially they “crop in” on the image being transmitted from the lens onto the focal plane. “Crop Factor” is the idea that imagers smaller than a full 35mm stills frame effectively increase the focal length of any given lens. Credit Card Policy for Walk-In Customers.Lights, Lighting Kits, Grip and Accessories.Streamers, Switchers, Routers & Accessories.Make A Statement and Be Seen With a Planar Video Wall.
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