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396
CINEMATOGRAPHIC ANNUAL
Potass, permanganate. 1 : 500 solution 50 c.c.s. 1 oz.
Diluted sulphuric acid, as given above 5 c.c.s. 50 mins.
Water 1,000 c.c.s. 20 ozs.
After reduction the film is given a brief rinse, is fixed in an acid fixing bath, and is then washed for half an hour.
The persulphate reducer may also be employed.
The film may best be intensified with the chromium intensifier. The silver intensifier is not at all suitable. Toning, tinting and mordant dye-toning may be carried out just as in the case of films printed from negatives.
B.J.. 1930. March 28. pp. 180-181.
LENSES FOR PORTRAIT STUDIOS
Focal Lengths of Lenses For Studios of Various Lengths
THE following table shows the focus of lens which is suitable for comfortable v/orking in studios of various lengths. In each case it is assumed that 5 ft. of the length will be taken up by camera, operator, sitter and background. The figures in column 1 are the full run of the studio, including this 5 ft. In the case of the short studios the focal lengths are about the longest which can be used: in the case of the longer studios somewhat greater focal lengths might be used, but the lenses directed in the table are about the best for general work.
C.D.V.
C.D.V.
j Cabinet
Boudoir
Boudoir
Length
C.D.V.
half length
head.
ihead and
half
head.
of
full
and
Cabinet
Boudoir
length.
Panel
Studio.
length.
Cabinet
half
full
Panel full
half
Feet.
Inches.
full length.
length.
length.
length.
length.
Inches.
Inches.
Inches.
Inches.
Inches.
12
4*
ey2*
8 1/7
9
12*
14
14
43/ *
74*
9
10*
13*
16
16
5 U
8':
10
101,:
16
18
18
6
8H
lO!/,
lOh
16
18
20
6
10
10' ;
12
18
20
22
7
ioy2
12
14
22
22
24
sy2
12
14
16
24
24
28
sy2
13H
16
16
24
24
30
10
13i;
16
18
24
24
* Full lengths may be obtained with tht that good perspective cannot be expected.
?ngths, but the standpoint is so near to the sitter