In article <4134daec$1@news.povray.org> , Nicolas Calimet 
<pov### [at] freefr>  wrote:

>> (unless it is a really expensive pro digital camera that you can get
>> a small new car for)
>
>  You mean e.g. the C*n*n 1Ds ?  ;-)

Except that it also only has a single CCD with 28.7 x 19.1 mm size.

>> This is why you get a tele effect if you use an
>> inexpensive digital camera with the same lens you used for a film camera.
>
>  Be careful, purists would tell you this is not a "tele" effect
> but simply a "crop" effect, as you don't change the caracteristics of
> the lens by reducing the captor size.

For the D1 it is called "Lens focal length conversion factor".  I guess this
is the marketing term for: "Engineering told management that a full-size CCD
sensor would be much more expensive".  Fact is that as with all ICs, for
CCDs the production error also increases with die size.  hence CCDs with
36*24 mm are rather expensive, but there are a few available these days
afaik.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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