A petal hood is essentially the projection of a round cylinder into the
four-sided pyramid of light rays that form the image. Where the round
cylinder (or round cone) intersects the four-sided pyramid of light rays the
edges of the petal are found. This means that it is really like and
under-sized rectangular hood with the corners cut away, which would wind up
looking like a 'squared petal' if you did that.
--
Jim Brokaw
OM-1's, -2's, -4's, (no -3's yet) and no OM-oney...
on 9/17/02 10:32 AM, Winsor Crosby at wincros@xxxxxxxxxxxxx wrote:
> Bill wrote:
>> (except that there are four places with no stuff on the
>> petal hood, so if a strong light is coming from just the right direction,
>> there's flare.
>
> Not sure which hood you are talking about. The petal hood on the
> 35-80/2.8 is round, extends out from the lens all around. It
> extends out further corresponding to the straight sides of the frame.
> There are no places where there is no "stuff."
>
>
>
> --
> Winsor Crosby
> Long Beach, California
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