6 The Camera and its Accessories 



with the second focus at the same distance from the 

 object, the image is three-quarters of an inch in height. 

 Many times I find it of great assistance to use the 

 longer focus, especially when coaxing some timid 

 animal iiito position to be photographed. 



If it were simply an increase in the size of the image, 

 it could be obtained with the telephoto attachment. 

 Within the last few years there has been a great deal 

 of literature upon this subject, and one might be 

 led to believe that with the purchase of a good tele- 

 photo the difficulties in photographing wild animals 

 would suddenly vanish. A telephoto may be ad- 

 justed to almost any lens, the magnification usually 

 varying from two to six diameters; but its use in 

 animal photography in general is very limited, and 

 principally for this reason — ^that the length of the 

 exposure is increased. The telephoto can be used 

 where an absolutely solid foundation for the camera 

 to rest upon may be secured, for the least vibration 

 will ruin the picture. It will probably be some time 

 before the telephoto will be perfected so as to be- 

 come a practical apparatus for animal photographers. 



In using a quick lens and for all snapshot work it 

 is absolutely necessary to make the exposures by 

 means of a shutter. Most shutters are in connection 

 with the Jens barrel, but the focal plane is not, and 



