- 7 - 
Table 2. 
Aper 
ture 
f: 5. 6 
f : 8 
fill 
f : 16 
Mean 
Square 
root of 
variance 
Camera constant (mm) . 
Picture Picture 
1 2 
c 74.7688 74.9225 
s 0.0470 0.0533 
c 
c 74.8202 74.7464 
s 0.0507 0.0520 
c 
c 74.4590 74.4255 
s 0.0585 0.0505 
c 
c 74.7135 74.7371 
s 0.0278 0.0327 
c 
c 
Picture Mean 
3 
74.7638 74.8182 
0. 0457 
74.7758 74.7808 
0.0460 
74.4657 74.4501 
0. 0612 
74.7290 74.7265 
0. 0360 
74.6939 
Square Degrees of 
root of freedom 
variance 
0. 0902 2 Between 
0. 0488 359 Within 
0. 0309 2 Between 
0. 0496 359 Within 
0.0215 2 Between 
0.0569 359 Within 
0.0120 2 Between 
0.0323 353 Within 
s 
c 
0. 1445 0. 0477