Kodak Retina Reflex - Close-Up Focusing for Retina Reflex Supplementary Lenses (Inches); Close-Up Depth of Field; Conversion of Film Speed Systems

CLOSE-UP FOCUSING FOR RETINA REFLEX SUPPLEMENTARY LENSES (INCHES)
Camera
Lens
Focusing
Scale
Setting
(Feet)
RETINA REFLEX LENS NI RETINA REFLEX LENS NII RETINA REFLEX LENSES NI + NII
Supplementary
Lens to
Subject Distance*
(in inches)
Approximate
Field size
(in inches)
Supplementary
Lens to
Subject Distance*
(in inches)
Approximate
Field size
(in inches)
Supplementary
Lens to
Subject Distance*
(in inches)
Approximate
Field size
(in inches)
inf 38.25 15.75x23.37 20 7.5x11.37 14.87 5.37x8
50 35.75 15.12x22.75 19.5 7.37x11 14.62 5.25x7.75
25 34.25 14.37x21.5 19 7.12x10.75 14.37 5.12x7.62
15 32.37 13.75x20.12 18.37 6.87x10.25 14.12 5x7.37
12 31.5 12.75x19 18 6.62x10 14 4.87x7.25
10 30 12.12x18.25 17.62 6.5x9.75 13.75 4.75x7.12
8 28.37 11.37x17.12 17.25 6.25x9.5 13.5 4.62x7
7 27.62 10.75x16.12 16.87 6.12x9.12 13.37 4.62x6.87
6 26.37 10.37x15.5 16.5 6x9 13.12 4.5x6.75
5 24.75 9.75x14.5 16.12 5.62x8.5 12.87 4.37x6.5
4.5 24 9.25x13.87 15.75 5.5x8.25 12.75 4.25x6.37
4 22.87 8.75x13 15.37 5.25x7.87 12.5 4.12x6.25
3.5 21.62 8.12x12 14.87 5x7.5 12.25 4x6
3 19.75 7.37x11.25 14.12 4.62x7 12 3.75x5.75
2.5 17.75 6.62x10 13.37 4.37x6.5 11.62 3.5x5.37
*measured from film plane
CLOSE-UP DEPTH OF FIELD
f 3.5
37.75
39.5
41.37
33.75
35
36.5
29
30
31.25
25.19
26
26.81
20.5
21
21.56
19.06
19.5
20
15.37
16
16.25
11.87
12
12.25
10.81
11
11.19
f 5.6
36.56
39.5
42.81
32.62
35
37.56
28.06
30
31.62
24.62
26
27.31
20.12
21
22
18.75
19.5
20.37
15.62
16
16.5
11.75
12
12.44
10.69
11
11.31
f 8
35.44
39.5
44.62
32.62
35
38.87
27.37
30
32.56
24.06
26
28
19.75
21
22.5
18.44
19.5
20.81
15.19
16
16.75
11.56
12
12.62
10.56
11
11.44
f 16
32.12
39.5
51.25
29.06
35
43.75
25.37
30
35.81
22.5
26
30.44
18.62
21
24.19
17.44
19.5
22.19
14.5
16
17.69
11.12
12
13.19
10.19
11
12
CONVERSION OF FILM SPEED SYSTEMS
ASA
and BS
Arith.*
ASA and
BS Log
(New)
DIN
BS
Log
(Old)
3 6 16º
6 1º 9 19º
12 2º 12 22º
25 3º 15 25º
50 4º 18 28º
100 5º 21 28º
200 6º 24 31º
400 7º 27 37º
800 8º 30 40º
1600 9º 33 43º
*Also Weston
35 mm. BLACK-AND-WHITE FILMS
Make
Speed in
ASA and BS
Arithmetic
Make
Speed in
ASA and BS
Arithmetic