The Houston daily post. [volume] (Houston, Tex.) 1886-1903, 1900-05-11

we have cautioned sos,n..
for the reason that tbs ~ overexu>
iaiiing OF the beginner il \ ~ @'ua
put, a little overexposurs y Osefsrl
handled In development thar n'rt III
posure, for we can sometim. " uattS,
negative from an overexnos.s ~ ~
there is something to hoIa Il ip'aie Nj
Impossible to get one when ~, g!
Ing to bring up, for II the ssr s.s Mi
short then there Is NOT su,sauu 4
plate to make picture 49, I'sut q n
there. WV WA I.
We shall md that a numbs. 7.
enter into the question Of lIrht y ne1l
OF the year, the time Of day srs ~ Il,
ton Of the atmosphere. t6s MI ue ''stt
sky, etc., all or any one ~ ~ 4,
make decided differences IN !, .nen "
and quality Of the Iiehr. ~ suatiJ]
Subjects that are of a ON, \,
and have no masses OF deen sh.s saafacsj
the camera require short aYna sasuoH Nj
as subjects with masses Of sh,S. ' !, -
Foreground require long exposprss Y. y
large portion Of the subisr, Z. nl7s
trees, as In the case Of forsst s, ! eSk
wooded ravines, very long ssne., asss
be required, because the rras,sr's ~
the light has been filtered th,oape,'f u
green leaves overhead, and th,s Ky! Y
even though the camera itself /. y. ~
der the trees. The color ~ ~. ~ Y
also influences the time ~ 49,. vNssl
yellow stone building requires lou S
posure than one of white stone =, =
red-brick building will require iii , -
Interiors of buildings ALWAYS . .s.ss
Longer exposures than ordinary ss 49,
subjects, but they show such rras, s ~
ences, according to the size And s, sas'
of the windows and the color o. IL s NJ
that the time required varies fror VI m
than minute to three or -four hms.
even more. Subjects including larss , +,
portion of sea and sky require, asaid
very short exposures. The time Of s,,.''
ure in the case of portraits yarI,s II.
much, and depends on the condIir,'
lighting, and also on the charactar IA.
effect desired.
The light is most active, land tbs 4
posures required are shortest in Luna !,
on a bright day the activity Of ~ NJ, 4
remains practically the same h.v..s !.
a m. and 8 p. M, and n Is equally M, 1
in May and July from 10 a. m. to2rn]
In spring and autumn longer exposure, 4, 4
required, and in winter the time uru
from three to ten times as long az IN IA. 4
according to the hour of the DIV. h,
light is least active In December. sua 4,
exposure required becomes shorter u
shorter as we approach June, and liz.
ward becomes longer and longer NTH 1
the maximum Is again reached In Deor.
be. The light increases In brightness N.
early morning until midday, when II II. 4
tains a maximum, and then falls Oh AMI
until sunset. the falling of being csafi,
erablv more rapid in winter than IA tu,. 4
mer. In very early morning and tos,t
sunset the exposures are always lcug 4.
pecially If the light is at all yellow
When the sun Is shining and there IN
white clouds in the sky opposite he "a
the exposures needed are shorter slhs
things being equal, than when the siy II
perfectly cloudless. A cloud actually Il
front of the sun. of course, lengthep, u
necessary exposure very considerab 80
the Slime Is true, In Smaller deg u
light clouds that do not complete "
scuTe the sun. Rain clears the atnr--
of dust, etc, and, other things being sSI
less exposure is required after shower||
II will be clear that the estimation T.
correct exposure requires Judgment
experience. The conditions are nek
constant and hence numerical tables u
only very approximate, although they "A
ford some assistance at the beginning. M
much help can be obtained from actind
meters because they only measure the l 4
tensity of the light where the photograph
err is standing, while what we ought
measure = the intensity Of the lieht
Elected from the different parts Of the 81 4
iect. Now and again and especially VII \
dealing with interiors they will ,ell
that the light is much yellower and y I
active than we should otherwise BIZ
believed.
The photographer must learn to " 4
upon his own Judgment, guided by The
ture of the subject. with special resn \
TO the proportion and depth Of the sht 1
ows; the apparent brightness Of the IND
on the ground glass, the time Of year,
time of day and the character Of the 1885, \
especially with regard to the pfsssn
Of clouds-even light ones-between =
sun and the arth, Brightness TO Tie
is not necessarily measure Of acliVy
on the Photographic plate, and, as alra'l
pointed ont, any yellowness--even taoM
slight--in the light lengthens consldd,'l
the time of exposure reouirr. sullon
exposure should ALWAYS be g<en 70!
dark parts of the subject; the brlshlYW
Illuminated pats will take care OF ~.
selves. The e-esg"ra given Will slso y
pend or the character OF the resul's = = \
quired; very short exposures incre's Z
contrast and long exposures reduce insa \.
trast. IF, theref're. you consider W..
subject is too strong for pictorial sps~
give a longer exposure, and wee xs nv.
For example, view including ~.
washed cottages mr. Other h-''isn'iy w.
ID objects, together with foliage, enl
quire a comparatively long expO'm.
harsh. contrasts in the negative aye Y :
avoided.