Archived posting to the Leica Users Group, 2002/01/25

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Subject: Re: [Leica] .... hood....
Date: Sat, 26 Jan 2002 01:43:45 +0800

A rectangular hood (with the correct aspect ratio for the format)
affords better shielding of stray light.  Cine cameras, Hasselblad,
TLRs (Rollei, Yashica, Minolta...) etc all use such hoods.  Have you
seen such cameras (or even AF zooms with the petal-shaped
abominations) sporting skewed hoods?  

The "lop-sidedness" relates to the manner of attachment.  The good-old
screw-on thread or a carefully designed bayonet will guarantee correct
alignment, just like the lens mount itself.


>There is no good reasons that I could think of in
>redesigning the round hood into rectangular other than
>perhaps vanity. However, by doing that, there is a
>very high percentage of rectangular hoods that looks
>loop-sided (not aligned properly) when attached to the
>lens. While a round hood has no geometrical
>misalignment, a rectangular hood sure compounds the
>problem. The lens, bayonet mount, the indentation on
>the lens AND the rectangular hood must all be aligned
>properly. Under observation of all my friends
>rectangular hoods, they all have this misalignment
>problem and to me its an eye-sore.

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