digital camera size comparison
digital camera size comparison
Does a camera’s sensor size affect apeture settings?
This is all example, so keep that in mind…
So I have a film camera with a 50mm f/1.8 on it. I take that off of the film camera and put it on a digital, say for example, an Olympus, and keep it at f/1.8. With the same aperture setting have a different depth of field on a smaller film (or sensor size)?
It seems like it should, cause the aperture is larger in comparison. So on a 4/3 system, an f/1.8 might be like a f/1.4 or something. But I don’t know this for a fact. If anyone could help me out, with a link or something, that’d be cool…
Aperture is aperture as far as the amonut of light that it admits, as many have told you. I notice this one point in your question, though, that makes me think that this is not actually what you want to know about. You ask, “With the same aperture setting have a different depth of field on a smaller film (or sensor size)?” The answer to this is that a smaller sensor will have greater depth of field than a larger sensor if the focal length and aperture are the same.
This gets confusing because we so often refer to the “equivalent” focal length instead of the actual focal length. On a small sensor camera, the actual focal lengths are ridiculously wide. Most of the more popular point and shoot cameras have the smaller sensors. It’s only about 5 mm wide and 4 mm high. The 3X lens required to cover that angle of view is an ACTUAL 6-17 mm zoom lens. (With a 6X crop factor, this “becomes” 36-102 mm.) At these focal lengths, the background is going to almost always be in pretty sharp focus, no matter what the aperture setting is.
On a 4/3 system, the crop factor is 2X. A “normal” lens is then 24-25 mm, which is what you commonly see. You know that a 24 mm lens on a 35 mm camera has quite a lot of “depth of field.” When you put it in front of the 4/3 sensor, it gives an apparent “normal” view at an “equivalent” focal length of 50 mm (because the smaller sensor crops off the outer edges of the potnential image), but it still has just as much depth of field as if it was in front of a full frame – film or sensor. It’s not that the f/1.8 is like an f/1.4. It’s that a 24 mm lens is always a 24 mm lens, regardless of whether you are treating it like it was a 48 mm lens or a 24 mm lens.
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