Re: Switching to a Canon digital SLR

Tue, 26 Jul 2005 22:44:37, Peter Guest <plg@xxxxxxxxxxxxxxxx> wrote:

>On Tue, 26 Jul 2005 21:52:54 GMT, Unspam wrote:
>
>>Don't forget the cropping factor of 1.6 I believe
>
>Sorry .... please explain

Your lenses will "behave somewhat differently" on a 350D, their
"angles of view [of the lenses] has shifted UP towards the telephoto
end." as stated in

http://www.luminous-landscape.com/tutorials/understanding-series/dslr-mag.shtml

"OK, firstly, when you put a 300mm lens on a D60 you do NOT get a
480mm lens ? it is still a 300mm lens. What has changed is the
format of the camera ? from 36x24mm film to a 22.7x15mm chip."

This smaller-than-film (CCD/CMOS) sensor chip is giving your lenses
(effectively) a smaller picture angle (referring to (Nikon has a
1.5x factor, Canon 1.6x - it's measured diagonally (see below))
http://www.nikon-image.com/eng/Nikkor_Lenses/af_spec.pdf) - due to
the fact that the film frame and the digital sensor have different
sizes. And when some of the light circle projected from a full-frame
EF lens falls outside the sensor, you get the crop - i.e. only a
part of the full frame!

If you look at the figures over at (Nick Rains has this covered,
too) http://www.digitalmagasinet.dk/show.asp?ID=577 , it's easy to
see that Canon can (or should want to!) make (smaller) lenses to fit
the smaller sensor size (EF-S) using much the same lens designs and
maybe improved glass for the smaller circle of confusion.

So... what was a "normal" lens before (50mm) is now a short
telephoto, and a wide-angle lens of 28-30-35mm (too bad the Sigma
300 f/1.4 is only available in Canon mount at the moment...) is the
new 'normal'.
.

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