Seconds Open panorama, with fields and trees.........................       1

Snow, ice, marine views...........       1

Panorama, with houses, etc........       2

Banks of rivers..................       3

Groups and portraits in open air (diffused light).................       6

Underneath open trees............       6

Groups under cover..............     10

Beneath dense trees..............     10

Ravines, excavations.............     10

Portraits in light interiors..........     10

Portraits taken 4 feet from a window, indoors, diffused light......     30

Table Showing Displacement N Ground Glass Of Objects In Motion

By Henry L. Tolman From the Photographic Times

Lens 6-inch Equivalent Focus, Ground Glass at Principal Focus of Lens

   

Distance on

Same

Same

Miles

Feet

Ground Glass,

with

with Ob-

per Hour.

per Sec-

in inches, with

Object

ject 120

ond.

Object 30 Feet

60 Feet

Feet

   

away.

away.

away.

1

1.5

.29

.15

.073

2

3

.59

.29

.147

3

4.5

.88

.41

.220

4

6

1.17

.59

.293

5

7.5

1.47

.73

.367

6

9

1.76

.88

.440

7

10.5

2.05

1.03

.513

8

12

2.35

1.17

.587

9

13

2.64

1.32

.660

10

14.5

2.93

1.47

.733

11

16

3.23

1.61

.807

12

17.5

3.52

1.76

.880

13

19

3.81

1.91

.953

14

20.5

4.11

2.05

1.027

15

22

4.40

2.20

1.100

20

29

5.87

2.93

1.467

25

37

7.33

3.67

1.833

30

44

8.80

4.40

2.200

35

51

10.27

5.13

2.567

40

59

11.73

5.97

2.933

W. D. Kilbey, in the American Annual of Photography, gives still another table for the exposure that should be given to objects in motion.

According to his method the table is made out for a distance from the camera 100 times that of the focus of the lens; that is, for a 6-inch focus lens at 50 feet, a 7-inch at 58 feet, an 8-inch at 67 feet, a 9-inch at 75 feet, or a 12-inch at 100 feet.

Toward At Right the Angles to Camera, the Camera.

Man walking slowly, street scenes....... 1/15 sec. 1/45 sec.

Cattle grazing....... 1/15 " 1/45 "

Boating.......... .. 1/20 " 1/60 "

Man walking, children playing etc........ 1/40 " 1/120 "

Pony and trap, trotting.............. 1/100 " 1/300 "

Cycling, ordinary.. .. 1/100 " 1/300 "

Man running a race and jumping...... 1/150" 1/450 "

Cycle racing........ 1/200 " 1/600 "

Horses galloping..... 1/200 " 1/600 "

If the object is twice the distance, the length of allowable exposure is doubled, and vice versa.