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Re: [OM] Lens hood - 40/2

Subject: Re: [OM] Lens hood - 40/2
From: ALEXSCIFI@xxxxxxx
Date: Sun, 5 Mar 2000 20:04:21 EST
In a message dated 2000-03-05 6:20:53 PM Eastern Standard Time, 
cnocbui@xxxxxxxxx writes:

<< I would agree.  Perhaps the hood for the 135mm f4.5 macro is the way to 
 to go.  This hood is quite deep and is the one recommended by Oly for the 
 90mm f2 macro.  It is a 55mm filter thread hood but one could use a step 
 up ring.
 
 Giles
 
 Chip Stratton wrote:
 
 > It strikes me as odd that a hood which is good for the 85/2 is also for the
 > 40/2, which has  twice the angle of view. If the hood for the 85 fits on 
the
 > 40, without causing vignetting, I would have to say that its not such a 
good
 > hood for the 85, which would benefit from a deeper hood.
 >  >>

    I recall reading an online comment that for 35mm lenses, the hood should 
be approximately equal to the focal length of the lens itself. I tried again 
to find that particular reference, but I couldn't. Anyway that means a hood 
that is TWO inches deep for a regular 50 lens!!! I have such a hood (Pentax 
49mm filter thread, for short teles), but have not had a chance to experiment 
with it. Using it on a 50, I could not see any obvious vignetting in the 
viewfinder. 
     I definitely plan to get a much longer hood for my 100F2.0--possibly the 
metal Zeiss hood for their 85F2.8. Also, I plan to get a 28mm Pentax hood for 
their 28F2.8 lens. This bayonets on, but I may consider modifying it or lens 
to work together. I personally would prefer rectangular hoods that bayonet on 
or tulips. Does anyone know of a firm which will produce custom hoods!

Alex

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