--- Bob Meyer <[EMAIL PROTECTED]> wrote:
>
> --- "Mr. Bill" <[EMAIL PROTECTED]> wrote:
> >
> >
> > Tom Pfeiffer wrote:
> > > The only naming convention I've figured out is
> > that the second letter
> > > signifies (W)ide, (S)tandard or (T)elephoto. Is
> > there more to it?
> >
> > Yes,
> >
> > � The first letter "B" is for "bayonet" if no B
> > then it's a screw-on or
> > clamp on.
> > � The number indicates the filter size 52 = 52mm
> > � The last letter indicates variations
> >
> > So, a BW-52C is a bayonet hood for a wide-angle
> lens
> > with a 52mm filter
> > thread. The last letter "C" indicates it is for a
> > 24mm lens (A=35mm,
> > B=28mm), specifically the FD 24mm f/2.8 (maybe the
> > f/2.0 as well).
>
> Only partly correct. The number does NOT refer to
> the
> filter thread size (at least not for bayonet mount
> hoods), but the the diamter of the bayonet mount.
> Lenses with 58mm filters generally take 62mm
> diameter
> hoods, for example.
Oops, let me apologise first. I got the old FD and
the new EF hoods mixed up. For the old FD stuff, you
were correct, the size matched the filter thread
diameter. For the new EF lenses, it matches the
overall barrel diameter.
=====
Bob Meyer
Life is uncertain. Eat dessert first.
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