> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Tom Pfeiffer
> Sent: Saturday, February 10, 2001 3:47 PM
> To: [EMAIL PROTECTED]
> Subject: Re: EOS 50 1.8
<snip>
> I assumed the lenses to have the same diameter as the filters they used,
> which is not pure science by any means :^)
Not even close. Since the f-stop is the ratio of the focal length to the
actual opening, the 50mm f1.4 has an opening of 35.7mm, and the 50mm f1.8
has an opening of 27.8mm. You can't even compare these directly; remember
that you're talking about area, not diameter.
Chuck Skinner
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