What diagonal length (which c is) has to do with focal length?
Luke
-----Original Message-----
From: Yen-Yi Liu [mailto:[EMAIL PROTECTED]]
Sent: 13 Februari 2001 15:49
To: [EMAIL PROTECTED]
Subject: Re: EOS [OT] 35mm/50mm versus human eye's perspective...
Carlo wrote:
> Here's a question that has been bugging me for a while...
>
> A lot of photography books state that the 50mm lens is the normal lens
because
> it best approximates the human eye's "perspective". However some other
folks
> have mentioned that a 35mm lens is a better alternative.
**snip**
To calculate a normal lense for any kind of film format. Use the following:
c2 = a2 + b2
(Pythagorean Theorem)
where "a" and "b" are sides of the film(say: 24mm and 36mm)
(NOTE: 24mm and 36mm are the sides of a regular 35mm frame)
then "c" results in ~43mm, which the normal focal length for 35mm film.
That's why Nikon ever made a 43~86mm zoom.
Yen
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