^ mea- 
t that 
non- 
; such 
ini- 
the 
. the 
ments 
nce 
nsity 
earin the 
e 
ry 
or (8 
[th 
ures 
The 
ons. 
ng 
| Kodak step tablet no.3 
  
  
«051 
+0.4 7 
   
  
High Defi 
+0.27 
+01% 
  
  
  
2.0 
X 
  
optische Dichte diffuse density 
a 
Fig. 7a,b: Influence of scanning pixel size and orientation of the 
emulsion for the Optronics P-1700 (like in fig.5). 
Emulsion towards the 
a) objective lens, b) condensing lens. 
Curves 4: 25. um pixel size; curves 2: 100 pm pixel size. 
lens, there are markedly smaller differences for the Plus-X 2h02 (fig.Tb) 
which range between pixel sizes of 25 um and 100 gm. Contrary to that the 
differences increase with High Definition Film. 
The dependency on the emulsion orientation and the magnifying optics of 
the Joyce-Loebl 3C8 is represented in the four selected diagrams of fig.8. 
The measurements taken on the calibrated Kodak step wedge were related to 
the densities of 0.36 and 2.31 of steps 3 and 16 indicsted in the cali- 
bration certificate (this explains at the same time the relative small 
variations of this wedge). Thus a density scale was set up by means of 
which the measuring values of the other wedges were converted into dif- 
fuse densities. The difference between the diffuse densities determined 
after DIN L512 (see chapter 2) and the converted values is recorded in 
the diagrams of fig.8. 
Remarkable and at first sight inexplicable is that the deviations obtained 
with the 20 times magnifying objective lens are greater than those ob- 
tained with the 10 times magnifying lens. The larger numerical aperture 
of the first-mentioned objective lens (2a, = 66°) stands for a better 
approximation to the standardized measuring conditions for the diffuse 
density than is the case with the 10 times magnifying objective lens.