THE TELK PHOTO LENS IX CINEMATOGRAPHY 



63 



amounts of ^vater vapor offers a tuiliid iiic- 

 dium to the passage of violet and ultra-violet 

 light waves, scattering them and producing 

 upon the photographic emulsion, which is 

 supersensitive to these rays, much the effect 

 that would be seen by viewing a landscape 

 through a sheet of finely ground glass. This 

 scattering effect of water vapor is at a maxi- 

 nunn in the ultra-violet rays, to which the 

 human eye is not very sensitive, and de- 

 creases toward the red end of the spectrum. 

 In addition to this, when the sky is blue the 

 distant mist reflects this light also and thus 

 makes matters worse for the photographer. 



ill order to remove these obstacles, due to 

 the presence of ultra-violet light, the special 

 tools to be used are the modern panchromatic 

 film and a deep yellow filter, scientifically 

 selected and adjusted for absorbing all of 

 the harmful ultra-violet rays mentioned. In- 

 deed, so great is the latitude with these new 

 tools that it is possible, if desired, to elimi- 

 nate the entire appearance of atmosphere in 

 distant views. 



The end to be sought for, however, is that 

 in which the resulting picture will as closely 

 as possible represent the view as seen in 

 nature by the eye. 



Snov\'>' egret nesting, Avery Island, Louisiana, regular 3" lens. 

 natal clown, the guarding parent spends much time brooding 



From motion picture film 

 by Norman McClintock 



While the voung wear the 



