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Re: [OM] Zooms at Dawn - the 50mm shootout - Teaser

Subject: Re: [OM] Zooms at Dawn - the 50mm shootout - Teaser
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sun, 25 Apr 2010 22:15:07 -0400
I too don't like the laws of physics to be violated.  I think I'm 
misunderstanding something.  I think I'll do some physical measurements 
just as JS has done.  But not right now.

Chuck Norcutt


usher99@xxxxxxx wrote:
> Esteemed colleague of Dr. Focus says:
> 
> My take also.  I don't understand the why and Shaw doesn't really say 
> other to comment on changing focal lengths.  But I don't believe his 
> results are in error... nor do I think they are specific to the 
> particular pieces of equipment he used.  He attributes these results to 
> the generic equipment arrangements.
> 
> Chuck Norcutt
>  
>  
> Something is very askew here.  My initial impression was that internal design 
> differences may save a modest
> amount of light, say 10-20%. I really really like JS's first macro book 
> "Closeups in Nature"  and he clearly takes careeful
> measurement of working distances.  I have trouble  with the finding that the 
> micro Nikkor 200mm at 
> f4 is still F4 at 1/2X  while straight extension  loses 1 stop as predicted 
> by  that N[eff] = N (1+M)--- 
> Clearly violates the "No free lunch principle" though Moose has a slightly 
> different designation. 
> I did not remember the statement on pg 75 that the Canyon 200 macro lost only 
> 1 stop at 1X????
> Perhaps I should have purchased stock in that cold fusion start-up afterall.
> I thought this Jabberwok issue was slain, though it appears to be just 
> wounded.  i will rejoice, 
> when it is clarified as it has bothered me for a looong time.
>  
>  
> “And hast thou slain the Jabberwock?
> Come to my arms, my beamish boy!
> O frabjous day! Callooh! Callay!”
> He chortled in his joy.
>  
> A puzzled frumious Mike
>  
> 
> 
> 
> Moose wrote:
> &gt; On 4/22/2010 3:41 PM, usher99@xxxxxxx wrote:
> 
> &gt; 
> &gt;&gt; and even made it into print  (pg 74 JS first macro book)
> &gt; 
> &gt; I'm not ready to dismiss Shaw's results without further consideration,as 
> &gt; they appear at first glance to be the result of empirical observation 
> &gt; and he seems to be fairly careful as experimenter and observer.
> 
-- 
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