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Sensor size. Depth of field is based on (1) sensor size (you want big), (2) aperture (you want a low number, i.e. big opening), (3) focus distance to nearest su
by berberous 10y ago
Sensor size. Depth of field is based on (1) sensor size (you want big), (2) aperture (you want a low number, i.e. big opening), (3) focus distance to nearest subject, and (4) focal length (I think...).
So on a full frame sensor camera, shooting someone's portrait with an 80mm will give you very shallow DoF, on a sensor the size of an iPhone, it's probably close to infinite.
Edit: I don't think the above is technically exactly correct...Here's a good explanation: http://www.cambridgeincolour.com/tutorials/depth-of-field.htm http://www.cambridgeincolour.com/tutorials/depth-of-field.ht...
- rodgerd 10y agoNit-pick: more exit pupil than sensor size, but they're a rough approximation anyhow. But you're correct that the short (actual, not equivalent) focal length of camera phones makes an f/1.8 completely irrelevant.
- NLips 10y agoSensor size doesn't really have an effect - it's about focal length. The reason sensor size seems to have an effect is because for the same field of view with a bigger sensor, you have a longer focal length. For the same focal length, aperture and focus distance, a larger sensor doesn't change DOF; it just adds more of the surroundings to the outside of the picture.