u 



BIRD STUDIES WITH A CAMERA 



obtained under the same conditions with, different 

 lenses. 



Placing a mounted Flicker {Colaptes auratus) on 

 a fence post, and setting up my tripod at a measured 



Lriis Trst X(,. 1. JLuuiituil l-'lirluT "11 triicu. \,nA, aistanee fifty feet. 

 Jiiglit-inch focus, Zeiss Convertible, No. 10, Scries Vila lens; dia- 

 phragm F. 8, Vss second ; Cramer " Crown " plate. Photographed at 

 noon, in .-^Lniliglit, November 30, 1899. 



distance of fifty feet, a series of test exposures was 

 made, of which three are presented as follows : First,^ 

 eight-inch lens (Zeiss Convertible Series VII a. No. 

 10), stop F. 8, time ^V RPcond ; second,* fourteen-inch 

 front lens of the combination, stop F. 10 (eqiiivalent 



