The Telepbotograpbic Lens and its Uses 77 



negative element, is but a slight additional ex- 

 pense. In consideration of its usefulness it is the 

 cheapest part of a nature worker's outfit and is 

 easily within the reach of anybody's pocketbook. 



To the beginner it may seem absurd, and, 

 indeed, to those who know nothing of the possibili- 

 ties of this lens it seems nothing short of miracu- 

 lous, that photographs can be taken of an animal 

 the size of a deer at distances varying from one 

 hundred to two hundred yards and good-sized 

 images be obtained. Yet this is not only possible, 

 but easy of accomplishment, when the camera is 

 used at its greatest extension and, in the bright 

 sunlight, the exposure necessary to obtain a perfect 

 negative does not exceed one to two seconds. In 

 fact, when one first uses this instrument he is apt 

 to over rather than under expose his negatives. I 

 know this was the case with me, for I found it hard 

 to realize that negatives could be made with it with 

 no greater exposure than I soon found was nec- 

 essary. I remember that when developing the 

 first negative I ever took with one I was com- 

 pletely mystified that it should come up positively 

 black, with almost no detail showing. This I 

 could not understand until I learned that instead 

 of the five-second exposure I had given I should 

 have used less than a quarter of a second. 



It is difficult to give any definite instructions in 

 regard to the exposure, as it increases in accord- 



