New-York tribune., 1906-10-28
PHOTOGRAPHIC ADVANCE
Difference Betueen Methods OF
Ddguerre and Those of To-dau.

were to step inside Madison Square Garden when
the Photographic Show opens on November S, he
would exclairn, '1mpossibleI Some deception is
being practised," Or if he felt fmpeIled tn he
thoroughly up to date. he would voice his senti-
naents in the one word. "F,4ker' That would be
because in Daguerre's time it required from
twenty to thirty minutes to take a photograph
whereas the photograph show in the Garden
viii deal only with the best and most modern
products of the photographers art
II you had been taking pictures with twenty
minute exposures. and had lived your life in the
belief that this was the highest speed obtainable
In Photography, and were suddenly confronted
with photographs made with exposures ranging
from one second TO 1-1.500th part of a second
your emotions would doubtless be hard to define
Then you could sympathize with Daguerre, IL
by any means. natural supernatural. he could
be present at the opening of the Photographic
Show.
Though the work shown at the show, which
viii continue two weeks, will be for the most
part that Of amateurs, IT will include much of
which professionals may we'll be proud. Every
branch of modern photography will be included
IN the layout, from the ordinary aimless outdoor
snapshot to the carefully posed interior time
exposure, and back again to those barely con-
caivable exposures of 1-1.O00th and 1-1,500th
part Of a second, with which modern photog
raphers are daily catching racehOrses at full
gallop. trains at top speed. and even, on rare
occasions, humming bird the wing a
flying squirrel in fight.
Daguerre made his pictures by putting and
taking off a cap cover from before the lens.
Nowadays most photographs made with the
so-called Iris diaphragm" shutter. a device the
opening in which may be made large small
like the iris Of the human eye for which it is
named, and which is operated automatically by
& bulb in the hand of the operator. But even
this Improvement, far superior though it is to the
primitive methods of DaguerTe, Will not answer
for the pictures made at the highest possible
speed yet attained, and this fact has called into
being the focal plane, or curtain Slide shutter
a device that never entered into the widest
dreams of Daguerre. This shutter. operating at
the back instead of the of the camera. is as
its name implies a curtain but it is made in two
or more parts with adjustable slit between
the parts, the size of which may be automatically
regulated from the outside of the camera This
sI in the curtain stretches clear across the SEN
stive face of the plate when the exposure Is
made, and because of the fact that such a small
portion Of the plate is exposed at a time as the
curtain moves it at high speed. 1t Is posi-
BILE to get pictures of moving objects with the
least amount of motion
In the train of the focal plane shutter have
come l1e various types OF ~
which the image is thrown by a hinged mirror.
interposed between the lens and the plate, up
ward on a ground glass at the top. instead Of
the back of the camera
Even in Daguerre's day If would have been
folly to have gone aheld with wide open lens,
and even few years ago photographers would
have sconed at the idea Yet that is just what
the rejecting cameras have made possible, and
now the man who Of these cameras
sinply winds up his curtain shutter. draws the
slide or covering from in front of the plate, and
goes after his subject with open lens The re-
fecetng camera has made possible practically
instantaneous certainty of focus The fashiight
has turned night into day for the photographer.
and IN many other ways has the AIT OF photog-
rzy6y advanced since those days, more than
half century ago. when Daguerre and hts AZ
sod2tes obliged to ask their pAtruns 10
Please keep stin for twenty Minutes