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 into 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 lens barrel, but the focal plane is not, and 
