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Question: 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!.!.!.Www@QuestionHome@Com
Best Answer - Chosen by Asker:
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!.Www@QuestionHome@Com
Yes, the aperture is exactly the same!. Aperture is the amount of light allowed into the camera!. No matter how large the sensor is, the amount of light stays the same!. And if you think about it like this, you don't need to decrease the shutter speed for a smaller sensor!.Www@QuestionHome@Com
you sound confussed, hope i dont confuse you more
f1!.8 is f1!.8 regardless of body!.!.!.!.!.!.!.!.!.
the aperture is in the lens, not the camera, switching a lens on cameras from a full frame 35mm to a cropped one effects the focal lenght not the apertures!.!.!.!.!.
try this site: http://www!.dofmaster!.com/dofjs!.html you will note the aperture is the same!.!.!.!.!.!.if you do some calculations -
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I don't think there is changes!. Because if ever there is something like "sensor booster," the manufacturers already brag on it!.
So, if you attached a lens to any camera (body), I am sure the aperture will still be the same!.Www@QuestionHome@Com
It's the same!.!.!.
Think of it as fractions of a circle, no matter how big the circle is, the angle still stays the same!.Www@QuestionHome@Com
check this link:
dpreview!.comWww@QuestionHome@Com
The only thing I am sure of is the fact the majority of digital SLR's use a sensor size slightly smaller than a 35mm film plane!. This means that the LENS will not be equivalent to 50mm!. It will be more like a 70mm lens due to the conversion factor on the digital camera!.
The only exception is perhaps a 3000 -5000 camera that has a full 35mm sized sensor!.
As for the depth of field!.!.!.!.its an interesting question!.
Lets say you have a smaller sensor, but the same size opening in the lens would be MORE light, so more exposure!.!.!.!.so your f/1!.8 would probably in theory give an adjusted exposure of f1!.4 !. In theory it sounds correct!.
However, that's if you were just to plop the lens on and keep everything manually set!.!.!.!.!.and then took a comparative picture with automatic settings!.!.!.!.!.you might see a slight difference!. In reality, the camera would probably make the adjustment internally!.Www@QuestionHome@Com
No, nothing will change, except for the crop factor!. Your 50mm lens will now take the picture as if it was 75mm lens on a film body!.
Here's an easy way to understand this!.
Your lens is the same distance from sensor as if it was from film!. It projects the same size circle of light on it!. The sensor just happens to be 1!.5 times smaller than the film!. What you get is a big circle of light with the small sensor in the middle, capturing only a part of the light from that circle!. If the sensor was bigger, or it was a film there - it would've extended to nearly edges of the circle, but now the sensor is fully inside of it!. That's all!. But the image projected remains the same!.
By the way - many lenses, especially cheaper zoom ones have light fall-outs near corners, because the film in your camera almost touches the edges of that projected circle!. also decrease in sharpness often observed there!. With your smaller sensor but full-size lens - the sensor is right in the middle of that projected circle and with some safety distance from edges!. Meaning actually a better, sharper picture!
Of course, all of the above applies to a case of digital sensor being set to the same ISO as the film in the camera you just took the lens from :)
LEM!.Www@QuestionHome@Com