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:
> > On 4/22/2010 3:41 PM, usher99@xxxxxxx wrote:
>
> >
> >> and even made it into print (pg 74 JS first macro book)
> >
> > I'm not ready to dismiss Shaw's results without further consideration,as
> > they appear at first glance to be the result of empirical observation
> > and he seems to be fairly careful as experimenter and observer.
>
--
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