modulation transfer function 
  
  
Figure 1 
Figure 2 
  
resolving power [L/mn] 
Influence of image motion on image quality, repre- 
sented by the modulation transfer functions (MTF) 
of lens, film and image motion 
1 AWAM lens (AWAM = Area Weighted Average 
Modulation transfer) 
2 MTF film 
3 MTF lens + film 
4-6 MTF image motion 
4 for e° = 10 um 
5 for &e' - 20 pum 
6 for Ae' = 40 
7 resultant MTF for lens + film + image motion 
Ae’ = 10 um 
e 
= 
light intensity 
Oo 
i 
  
  
v 
~ 
light intensity 
o 
wu 
  
a) Image blur owing to forward motion represented 
by the shift of intensity distribution at an 
edge 
1 Intensity distribution in case of static 
exposure 
2 Intensity distribution in case of forward 
motion by the amount ZAe' on exposure with 
an ideal shutter (1005 efficiency) 
3 Intensity distribution of the really 
imaged, blurred edge on exposure with a common 
shutter (efficiency about 70%) 
b) Efficiency of a common between-lens shutter 
164