Very few actually use lenses long enough to be a problem.  In fact my 
longest lens is a good thirty years old but doesn't have an aperture 
ring since it's a 600mm mirror tele.  My most used long lens is the 
SMCP-A*300mm f4.0.  It balances very nicely with my hand well within 
reach of of the aperture ring.  I would think that most really long 
lenses don't get stopped down much anyway.  Wouldn't you be trying to 
maximize shutter speed, I know I am when I use one.

John Francis wrote:

>On Sat, Sep 16, 2006 at 11:48:56PM -0700, Brendan MacRae wrote:
>  
>
>>Oh, it's cumbersome compared to turning an aperture
>>ring. Your hand is already there to support the lens.
>>    
>>
>
>As has been pointed out many times in the past, that's
>incorrect if you're using a long-ish telephoto; your
>hand is nowhere near the aperture ring.  It may be on
>the focus adjustment, it may just be supporting the
>lens (or steadying it, if you're using a monopod).
>But the one place it won't be is at the back of the
>lens, near the camera body.
>
>
>  
>


-- 
Things should be made as simple as possible -- but no simpler.

                        --Albert Einstein



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