Does a 4.0-72mm lens with a 24-432mm equivalent mean a 6x crop factor?
Asked 1/19/2016
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My Samsung WB250F lens is labeled 4.0-72.0mm, and the camera specs list a 35mm-equivalent focal length range of 24-432mm.
Does that mean the camera has a 6x crop factor? If so, is that because the smaller sensor gives the same field of view as a 24-432mm lens on a full-frame (35mm) camera?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
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Yes, this mean crop-factor of your camera (Samsung WB250F) is 6
Focal length is one of the ways to calculate crop-factor, divide 35 equivalent of focal length to the focal length on the lens
P.S. The canonical way (as far as I know) is to use the size of the sensor and compare it with the size of fullframe sensor. Check here for reference
Originally by user34947. Source · Licensed CC BY-SA 4.0
user34947
10y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. If the actual focal length is 4-72mm and the 35mm-equivalent range is 24-432mm, the conversion factor is 24 ÷ 4 = 6 (and also 432 ÷ 72 = 6), so the camera’s crop factor is about 6x.
That means the lens does not physically become longer; instead, the camera’s smaller sensor captures a narrower field of view. So a 4mm focal length on this camera gives about the same angle of view as a 24mm lens on a full-frame 35mm camera, and 72mm gives about the same view as 432mm on full frame.
This is why compact cameras often show both the real focal length and the “35mm equivalent” focal length. The more fundamental way to determine crop factor is from sensor size, but based on the focal-length numbers you gave, 6x is correct.
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