Quantum CALCU-LIGHT X Operating Instructions Manual - page 5
The DIN scale is marked in steps of 3 (0, 3, 6,...48). Intermediate markings (dots) are whole numbers, i.e., 0 1 2 3 4 5
6 ... etc.
The ASA scale shows only the bold type values listed below. The intermediate values are marked by dots on the dial
scale.
0.8 1.0 1.2 1.6 2.0 2.4 3.0 4 5 6 8 10 12 16
20 25 32 40 50 64 80 100 125 160 200 250 320 400 500
640 800 1000 1200 1.6M 2000 2500 3.2M 4000 5000 6.4M
8000 10,000 12M 16,000 20,000 25M 32,000 40,000 50M
Ultra-High Film Speed Markings
Use the DIN scale pointer. There are four undesignated line markings to the left of DIN 48. They are DIN 51, 54, 57,
60. These correspond, respectively, to ASA 100,000, 200,000, 400,000, and 800,000.
Ultra-Low Film Markings
Use the ASA scale pointer. There are four undesignated line markings to the right of ASA 0.8. They are ASA 0.4,
0.2, 0.1, 0.05. They correspond, respectively, to DIN -3, -6, -9, and -12.
F-Number Markings
The f # scale is marked with the bold type values below. The intermediate values correspond to the dots on the dial,
with the exception of f/0.7 and f/181, which correspond to lines. 0.7 0.8 0.9 1 1.1 1.3 1.4 1.6 1.8 2 2.2 2.5
2.8 3.2 3.6 4 4.5 5 5.6 6.4 7.1 8 9 10 11 13 14 16 18 20 22 25 29 32 36 40 45 51 57 64 72 81 91
102 114 128 144 161 181
Shutter Speed Scale
The shutter speed scale is marked with the bold type values below. Intermediate values correspond to dots on the
dial scale.
1/sec.
4000 3000 2500 2000 1600 1250 1000 800 640 500 400 300 250 200 160 125 100 80 60 50 40 30 25 20 15 12 10
Sec.
1/8 1/6 1/5 1/4 1/3 1/2.5 1/2 1/1.6 1/1.3 1 1.2 1.6 2 2.5 3 4 5 6 8 10 12 15 20 25 30 40 50
Min.
1 1.2 1.6 2 2.5 3 4 5 6 8 10 12 15 20 25 30 40 50 60
To obtain frames-per-second for movie work, divide values in 1/sec chart by 2.
Contrast Ratio Table
The difference between two digital readings can be converted to the numerical contrast ratio in the chart below.
Digit difference contrast ratio
0
0
1
1.3:1
2
1.6:1
3
2:1
4
2.5:1
5
3:1
6
4:1
7
5:1
8
6:1
9
8:1
Digit difference contrast ratio
16
40:1
17
50:1
18
64:1
19
80:1
20
100:1
21
128:1
22
160:1
23
200:1
24
260:1
25
320:1