Re: [Leica] Let's Settle the MLU question...

[Edward Meyers <aghalide@panix.com>]

On Thu, 17 Jun 1999, B. D. Colen wrote:

> Dr. Black Tape suggests the following unscientific study to settle for all
> times - on the LUG - the debate over whether a pro, and pro camera, can
> survive without having graduated from MLU:
> 
> Beginning today, for the next 90 days make a note of each time you need to
> use MLU - what subject you are shooting and under what circumstances. At the
> end of 90 days, post a message on the LUG describing the number of times you
> had to use MLU and describe the circumstances.
> 
> And by the way, while Dr. Black Tape doesn't necessarily argue with
> Keppler's conclusion that images made at a 60th with MLU are sharper than
> those without, he wonders how many images Keppler was unable to make because
> he couldn't see them through his blacked out viewfinder. :-)
> 
> -----Original Message-----
> From: owner-leica-users@mejac.palo-alto.ca.us
> [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of
> TDSatty@aol.com
> Sent: Thursday, June 17, 1999 7:36 AM
> To: leica-users@mejac.palo-alto.ca.us
> Subject: Re: [Leica] Leica Users digest V9 #56
> 
> 
> > At 07:45 PM 6/16/99 -0400, you wrote:
> > >In fact, it would be
> > >logical to assume that the F5 would have the *best* dampening system of
> all
> > >their bodies and therefore need MLU the least.
> > >
> > >DT
> 
> That's what a Leica Rep told me about the R8, but you should look at the
> latestest Popular Photography, Keppler's column, for an interesting test of
> MLU v non-MLU, using a Nikon F5 -- up to 157% higher lines-per-millimeter
> resolution, and improvemnt came throughout the 1/60-1/8 range tested.
> Keppler said  he was so surprised he intends to run more tests.
> 
> Tom Schofield
> 
> 
Oh how people forget.... The first lens tests made by Modern Photography
in the very early 1960s were made by not using the shutter of the 
camera. Exposures were made by turning off the lights, then opening the
shutter and turning off the lights and then closeing the shutter. This
was to eliminate any movement caused by the mirror or shutter bounce.
I know this was done, because I was the person doing the tests with
Keppler.
Later, it was discovered, by genious David B. Eisendrath, that
at very long exposures (seconds to minutes) the mirror movement
didn't matter at all, as it only took place during a small time of
the film exposure. It did matter during brief exposures (according
to Eisendrath) of less than 1 second or so.
It will be interesting to find how this ends up, as not too many
modern cameras have mirror lock-up. The tendancy will be to report
that it doesn't matter, when sometimes it does matter. The heros
will report the truth. Ed Meyers