Spring 2012

Spring 2012
by ani

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1

Lenses are described by their focal-length because this is a physical property. It does not change with sensor size. What people really care about though is the angle-of-view. The angle-of-view provided by an 18-55mm lens on a DX sensor is the same as the angle-of-view of a hypothetical 27-82mm lens on a full-frame sensor. This is why it is said to be ...


-2

As you have been told already you got it backwards but otherwise you are correct. A 18-55mm DX lens is about the same as a 12-36mm on an FX body. The focal length of a lens is ALWAYS dependant on sensor size, in how it effects the final image. See this video for a practical demonstration: https://www.youtube.com/watch?v=f5zN6NVx-hY


0

Yes and No, if exposure is the same, smaller sensors give more image noise, if you crop factor ISO and changes exposure accordingly to compensate, then you will get the same picture but different exposure. More detailed explanation in this video: https://www.youtube.com/watch?v=DtDotqLx6nA


3

The way I understand crop-factor is that a 12mm lens mounted on an FX body will provide the same field of view of an 18mm lens mounted on a DX body, provided the distance between camera and subject remains unchanged. You have it backwards. What crop factor means is that an 18mm lens on DX yields the same field of view as 27mm (18mmx1.5) on full frame. A ...


1

for the explanation to be true, it has be an 18-55 FX lens mounted on a DX camera body. Can't then only the crop factor (1.5X) kick in? No. The focal length of a lens is the same no matter what size sensor is in the camera body. But a smaller sensor sees only the middle part of the image that the lens projects, so the field of view as seen by the sensor is ...


1

The answer will vary from lens to lens, and probably on other factors as well, such as whether the image stabilizer is in the center. :-) The biggest problem with Canon's EF-S design has nothing to do with the image circle and everything to do with the short backfocus. Because the back of the lens sticks farther into the camera with EF, moving from a 1.6x ...


3

The diagonal of the 70D 22.5x15mm sensor is 27.04mm. The diagonal of the 700D 22.3x14.9mm sensor is 26.82mm. That's a difference of less than 1%. The smallest APS-C sensor Canon has released is 22.2x14.7mm (EOS 1100D/Rebel T3). The largest is 22.7x15.1mm. This sensor first appeared in the 10D which was introduced before the EF-S lens system. EF-S lenses ...



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