What you need to know about crop factor
Bear in mind that many modern DSLR’s have what is know as the crop factor. I.e.:
- Canon EOS 600D, 60D, 70D etc. = 1.6x crop factor
- Nikon D80, D300 etc = 1.5x crop factor
- Canon EOS 1D Mark III = 1.3x crop factor
- Canon EOS 5D Mark III, 1Ds and Nikon D4, D800 = Full frame
When taking into account the crop factor, you should multiply the focal length of your lens by each amount when used on that camera.
For example, when using a 50mm lens on a Canon EOS 40D, it becomes:
- 50mm x 1.6 = 80mm
On a Nikon D300 it becomes:
- 50mm x 1.5 = 75mm
On a Canon EOS 1D Mark III it becomes:
- 50mm x 1.3 = 65mm
On a Canon EOS 5D full frame it becomes:
- 50mm as the sensor is full frame.
Note: The focal length of the lens isn’t actually changing, it is just the image that is being cropped during exposure by the smaller sensor…it can’t capture the entire scene like a full frame. For example, I could get the same image from a full frame sensor as I can on a 1.6x crop factor sensor if I just crop the extra parts of the full frame image away in editing.
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