PHOTOGRAPHIC APPARATUS. 



k^'V^'%^ 



THIS figure shows (he size of objects and large 

 field obtained when photographing at a given 

 distance with the Convertible Anastigmat Lens 

 of 6t inches focus, composed of systems of 9 and 

 14 inches focus. The Convertible Lens works at full 

 opening and gives speeds of F: 6.3, F: 7.0, and /-'. 

 7.7, according to combinations used. 



BAUSCH & LOMB=Zeiss 



i 



THIS figure shows the size of objects and field 

 obtained when photographing at the same 

 distance as the first with the back lens of the 

 6T-inch focus Convertible Anastigmat, at a speed of 

 F: 12.5. The systems of the Convertible Anastigmats 

 have FOUR LENSES, making each of them a first'class 

 rectilinear lens. This is the only lens made in which 

 the front and back systems can be used separately, 

 and give good results and great speed. 



Convertible 



Anastigmats 



THIS figure shows the size of objects and field 

 obtained when photographing at the same 

 distance as the first with the front lens of the 

 6T°inch focus Convertible Anastigmat. Compare 

 these three figures and see the advantages of 

 having a lens which varies from 61 to 14 inches 

 focus at will, and gives best results under all 

 conditions. Catalogue free. 



MANUFACTURED BY 



BAUSCH & LOMB OPTICAL CO., 



^ ^^^i^B— New York. ROCHESTER, N.Y. Chicago. 



