eleni
hi everyone.I just have some things confused in my mind.I was thinking of buying wide angle lens.The thing is i have a nikon d3100 which is a crop sensor camera.so the standart mm for wide angle is at 35mm?. this means that anything until 35 mm is considered wide angle right?so if i buy lets say a 12-24 mm lens shooting at 12 mm on my camera that would really be 18 mm(cause of 12 mm x 1.5 crop factor =18 mm).Unless i am using DX Lens?If i buy a DX lens then i dont have to multiplie the mm x the crop sensor?so which wide angle lens is best for crop sensor cameras?
hope that makes sense
thanks
What i am trying to say is that if its stated on the lens DX does this means that when shooting for example at 12 mm, it will actually be 12 mm and not 18 mm( 12 x 1,5 crop sensor=18 mm)?DX means the lens is especially for dx cameras?
Answer
First, the focal length of a lens never changes even on a crop sensor DSLR like your D3100. What does change, however, is the "equivalent angle of view". At 18mm your 18-55mm zoom will have the equivalent angle of view of a 27mm lens on a 35mm film camera or full-frame DSLR. The focal length is still 18mm. A 12mm lens on your D3100 will have the equivalent angle of view of an 18mm lens on a 35mm film camera or full-frame DSLR. The focal length is still 12mm.
Whether the lens is DX or FX the 1.5x crop factor applies.
On a 35mm film camera or full-frame DSLR a focal length of 50mm is considered a "normal" lens because its angle of view approximates that of your eyes. On your D3100 the 50mm has the equivalent angle of view of a 75mm lens so it is a good choice for portraits. A 35mm lens on your D3100 will have the equivalent angle of view of a 52.5mm lens so on your D3100 it would be considered a "normal" lens - just like a 50mm lens on a 35mm film camera or full-frame DSLR.
First, the focal length of a lens never changes even on a crop sensor DSLR like your D3100. What does change, however, is the "equivalent angle of view". At 18mm your 18-55mm zoom will have the equivalent angle of view of a 27mm lens on a 35mm film camera or full-frame DSLR. The focal length is still 18mm. A 12mm lens on your D3100 will have the equivalent angle of view of an 18mm lens on a 35mm film camera or full-frame DSLR. The focal length is still 12mm.
Whether the lens is DX or FX the 1.5x crop factor applies.
On a 35mm film camera or full-frame DSLR a focal length of 50mm is considered a "normal" lens because its angle of view approximates that of your eyes. On your D3100 the 50mm has the equivalent angle of view of a 75mm lens so it is a good choice for portraits. A 35mm lens on your D3100 will have the equivalent angle of view of a 52.5mm lens so on your D3100 it would be considered a "normal" lens - just like a 50mm lens on a 35mm film camera or full-frame DSLR.
Using a DX lens on a DX camera?
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.
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