> Neither Bill nor I contended that our experience would be true for other
> lenses, other situations, other cameras, nor were we trying to refute the
> laws of physics. However, JCO, and now Mr Papenfuss, Ph.D., PPSEL-IA,
> claim that longer lenses are always easier to focus, although Mr Papenfuss
> at least has the good sense to add a rather long list of qualifiers to his
> argument.
>
> Never did I think that this thread would get so contentious, and that it
> would run for so long. And now Mr. Papenfuss, Ph.D., PPSEL-IA has joined
> the fray and gotten things going again. All the scientific evidence and
> book learnin' in the world cannot change the experience Bill and I had,
> regardless of what the laws of physics says. Of course, Mr. Papenfuss was
> careful to qualify the heck out of his comment, which is as it should be,
> because there are numerous variables in the real world, which,
> unfortunately for some people, is where we have to live, work (and
> photograph) these days.
>
I believe I also was careful to qualify the word "easier." That's
a very subjective term and as such completely depends on the person making
the judgement. I was trying to separate the physics from the personal
opinions. As such I believe that I referred to it as a sensitivity and a
"focusing gain," if there is such a term.
> Now, were we to try the test in a lab, eliminate all variables, use
> scientific measuring tools, remove the human element, it may be that the
> 105mm lens could be proven to focus easier or more accurately than a 35mm
> lens.
>
Not necessarily "easier," but more accurately. There's a
difference. Basically the difference between accurately reading your
speed of 25 mph from two different speedometers. If one's max scale is 80
mph and another's is 250, the former will result in a more accurate
determination of the 25 mph (assuming all other variables are equal).
> Shel (a man of no letters)
>
I use the same email account here as for my professional
correspondences. I appologize if it seems pretentious, condescending, or
otherwise out-of-place, but I only have one .signature. You will see
the same .sig on my posts regarding other hobbies (flying, homebrewing,
etc).
-Cory
--
*************************************************************************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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