All the modern wide angle hoods for the Leica M cameras are rectangular in
shape. That includes the 21, 24, 28, & 35. Shades for the 50's and 90's
are all circular.
My guess is that the 35-80/2.8 hood is tulip shaped because that's the only
way that they could get the maximum shading for both ends of the focal
length.
FYI, the hood for my late 28-105/2.8 Tamron was also tulip shaped. As are
all the hoods for ~17-35 zooms for Nikon, Canon, etc.
Skip
At 08:46 PM 10/12/00 -0400, you wrote:
I remember such a hood many years ago. It was for another camera
system. I would assume that it slipped on or it may have been hard to line up.
Gregg
Lex wrote:
My guess is the tulip shape provides the maximum protection from flare
without causing corner vignetting. I suppose the ideal shape would be a
rectangle matching the proportions of the 24x36 frame, but I've never
seen such a hood.
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