JDR
If you use a DX lens on a DX camera do you still have to add in the crop factor to the focal length?
I was thinking of getting the Nikon 35mm DX lens. Will it be true 35mm or will it actually be 52mm????
Answer
You are confusing several terms here.
The 35mm lens will be true genuine and real 35mm on any camera. This is a physical characteristic of a lens. It means that from entering the first element and until reaching the sensor the light travels exactly 35mm. That's what a focal length is. So all physical characteristics of the image, including the depth of field, size of bokeh and aperture of that lens will be exactly the same on any camera.
Now, as far as the field of view - or coverage area, it will of course cover the smaller area, than a full frame camera, because the sensor is smaller. So it will cover about the same area as a 52mm lens on FX body. But it is not correct to say, that it will actually be 52mm, it will still be 35mm, with a coverage equivalent of 52mm lens on a film camera.
The difference between DX and FX lens, is that DX lens projects smaller circle of light, so that when used with a smaller DX sensor, it just fits into that circle. This allows to make lenses smaller, lighter and cheaper. The FX lens would project larger circle, that is big enough for full size sensor, part of which will not be utilized in DX body. That's the only difference. But a 35mm lens is always 35mm.
Hope I didn't confuse you too much?
LEM.
You are confusing several terms here.
The 35mm lens will be true genuine and real 35mm on any camera. This is a physical characteristic of a lens. It means that from entering the first element and until reaching the sensor the light travels exactly 35mm. That's what a focal length is. So all physical characteristics of the image, including the depth of field, size of bokeh and aperture of that lens will be exactly the same on any camera.
Now, as far as the field of view - or coverage area, it will of course cover the smaller area, than a full frame camera, because the sensor is smaller. So it will cover about the same area as a 52mm lens on FX body. But it is not correct to say, that it will actually be 52mm, it will still be 35mm, with a coverage equivalent of 52mm lens on a film camera.
The difference between DX and FX lens, is that DX lens projects smaller circle of light, so that when used with a smaller DX sensor, it just fits into that circle. This allows to make lenses smaller, lighter and cheaper. The FX lens would project larger circle, that is big enough for full size sensor, part of which will not be utilized in DX body. That's the only difference. But a 35mm lens is always 35mm.
Hope I didn't confuse you too much?
LEM.
can you use an FX lens on a DX camera body?
Jacob
I have a nikon D3000, which is dx, and i would like to know if i could use an fx lens on it
Answer
proshooter's answer might be confusing to you. You absolutely can use an FX lens on your camera. You will see EXACTLY what the image will look like in the viewfinder before you take the picture. His answer makes it sound like you will lose some of what you see in the viewfinder, but you won't.
Technically, he is correct. The FX lens throws a larger image circle, but the sensor only uses part of the potential image.
I use FX lenses on my DX camera almost every day. No problems.
proshooter's answer might be confusing to you. You absolutely can use an FX lens on your camera. You will see EXACTLY what the image will look like in the viewfinder before you take the picture. His answer makes it sound like you will lose some of what you see in the viewfinder, but you won't.
Technically, he is correct. The FX lens throws a larger image circle, but the sensor only uses part of the potential image.
I use FX lenses on my DX camera almost every day. No problems.
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