>>Olympus offers two different lens hoods for 50mm lenses, the
>>#108233 for the 50mm f1.2 and the #108230 for the 50mm f1.4,
>>50mm f1.8, 35mm f2.8, and 35-70mm f3.5-4.5. All of the above
>>lenses employ 49mm filters. Why does Olympus sell two different
>>hoods? A suitable hood for 35mm f2.8 would probably also be
>>good for 50mm f1.2. A suitable hood for 50mm f1.2 is definitely
>>good for "lesser" lenses like a 50mm f1.8. You see my point? If
>>this were a mathematics list, we'd have a nice discussion of over-
>>lapping domains. I wonder if the separate hoods aren't a holdover
>>from the days of when the prime 50mm lens used a 55mm filter,
>>and when the lens changed to 49mm filter size, someone forgot to
>>eliminate the redundant hood.
>
>Since my 50mm 1.4 rubber lens hood clamps around the outside of the
>barrel the filter diameter does not matter.
Both of the above lens hoods are of the clamp-on variety. And not
to be argumentative, it does matter, only indirectly. The hood does
indeed clamp on to the outside of the lens, but the outside diameter
is the same as the inside diameter plus the thickness of the metal (well,
actually the outside diameter will be the inside diameter plus *twice*
the metal thickness, but you already knew that). The clamp will only
adjust within a narrow tolerance, not larger, and only a little smaller.
Pete
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