The reason is the smaller sensor sizes of most DCs. You can see it quite
dramatically here
<http://www.dpreview.com/learn/?/Glossary/Camera_System/Sensor_Sizes_01.htm>.
Having a smaller than full frame sensor is like cropping the film so
only the central portion remains. Thus a 50mm lens puts a full size
image into the camera, but the sensor only can use part of it. In the
case of the E-1, it can only use about half, so the portion it captures
covers about the same portion of the subject as a 100mm lens would on a
full sized frame. Hence the multiplier of 2. It is fairly easy to
remember the multipliers for the DSLRs.
C.H.Ling wrote:
>Olympus E-system is 2x. N*kon DSLR is 1.5x, C*non is 1x (1Ds), 1.3x (1D, 1D
>MK II) or 1.6x (10D, 300D, 20D) depends on which model.
>
>----- Original Message -----
>From: "Evan Ruff" <evan@xxxxxxxxxxxxxxxx>
>
>
>
>>When I see a Nikon 24mm f/2.8 DX, is that a 24mm lens or a 48mm lens?
>>
On a D70 or 100, it is equivalent in FOV to a 36mm lens on 35mm film, as
the multiplier for them is 1.5x. A Zuiko 24/2.8 on an E-1 would be 48mm
eq. But on a Can*n 10D, 20D or 300D, which have slightly larger sensors
than the E-1, the same lens would be 38mm eq. Confused yet? There is a
graphic comparison of E-1, small Can*n and 35mm film on the bottom of
this page <http://www.dpreview.com/reviews/olympuse1/>.
>>With the prosumer cameras, such as the Oly 8080, is that a 7.1 - 36.6mm lens
>>(obviously not)
>>
For other DCs, there are quite a few sensor sizes, all much smaller than
on DSLRs. Labeling varies, some showing only 35mm equivalent, some only
actual focal lengths and some both. In all cases, you can find out the
35mm eq. range from the manufacturer's web site, the manual or the many
review sites on the web. In the case of the 8080, the lens is actually
7.1 - 36.6mm but is equivalenyt in field of view to a 28-140mm on full
frame 35mm film.
Moose
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