Hi folks!
A confusing question came to me:
To have FF equivalent focal length of a lens for our APS-C sensors, we have to
apply a factor of 1.6x: 40mm f/2.8 ltd is a 64mm FF equivalent. For the depth
of field, this factor is to be applied too: 40mm 2.8 ltd is a 64mm f/4.5 FF
equivalent.
But,
The lens collects the same amount of light whether you put it in front
of an APS-C of full frame sensor/film. Nothing has changed about the
lens.
Also, I would avoid focal length equivalencies. You will only confuse
yourself. A 40mm lens is 40mm no matter what camera you put it on.
On Mon,
This is why I hate equivalent focal lenghts. :-)
The amount of light reaching the sensor does not depend on the size of the
sensor, and is simply expressed by the f-stop. The f-stop is simply defined as
the focal length divided by the size of the opening, so with a 200mm f/4.0 lens
the
Once upon a time it was easy to simply remember whether a lens was a
normal or telephoto, etc., because there were only two dominate
formats, 355mm and MF. Nowadays, we have an increasing range of
sensors with interchangeable lenses. Since no one seems to want to
work with coverage angles, the
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