



















HIS figure shows the size of objects and large 
field obtained when photographing at a given 
distance with the Convertible Anastigmat Lens 
of 64 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 F: 
7.7, according to combinations used. 




4 
AUSCH & LOMB-Zeiss 
Le figure shows the size of objects and field — ‘ 
obtained when photographing at the same 
distance as the first with the back lens of the — 
61-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 i 
rectilinear lens. This is the only lens made in which * 
the front and back systems can be used separately, m3 
and give good results and great speed. 

: 
ONVERTIBLE =. 
ANASTIGMATS § 
HIS figure shows Ry size of objects and field 
obtained when photographing at the same a 
distance as the first with the front lens of the “< . 
14-inch focus Convertible Anastigmat. Compare — 
these three figures and see the advantages of z ) 
having a lens which varies from 6; tol4 inches @ 
focus at will, and gives best results under all & 
conditions. Catalogue free. P 

MANUFACTURED BY 
BAUSCH & LOMB OPTICAL CO., — 
New York. JROCHESTER, Nove Chicago. 7 @ 


