In a message dated 15-Mar-02 5:53:11 PM Central Standard Time, 
[EMAIL PROTECTED] writes:


> Fixed hoods on zooms are basically a bodge. That is, a compromise. I've 
> often thought that a brilliant lens hood design would incorporate moving 
> parts to deepen or shallow-out depending on focal length selected, 
> automatically.
> 

My late (it fell apart with no provocation) Sigma 28-70/2.8-4 zoom had a hood 
that more or less did this; the hood attached (by bayonet mount) to the zoom 
collar and the movement of the lens barrel relative to the hood made the 
correction.

So I guess Sigma has done *something* brilliantly ... if only they'd made 
that lens more durable!

ERNR

My photographs hang on the virtual walls at
http://members.aol.com/ernreed
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