THE DEVELOPMENT OF THE PHOTOGRAPHIC OBJECTIVE 55 



Table VI. — Photographic Objectives. — {Continued) 



Name 



/- 

 number 



Field, 

 degrees 



Foci 



Type and figure 

 number 



Remarks 



Bausch and Lomb Optical Company, Rochester, N. Y. 



Aero lens 



Aero lens 



Aero lens 



Aero lens 



Aero lens 



Aero Tessar 



Aero Teasar 



Convertible Protar series 



7a 



Extreme wide angle, 



series 5 



Medium wide angle, 



series 4 - 



Metrogon 



Micro Tessar 



Plastigmat 



Process-anastigmat 



Protar, series 7 



Raytar 



Sigmar 



Tessar Ic 



Tessar 



Tessar 26. 



8M in- 

 12 in. 

 8M in. 

 6 in. 

 &)4 in- 

 24 in. 

 24 in. 



4-23 in. 



3K-37 in. 



2}.^-48 in. 

 5>8> 6 in. 

 16-72 mm. 

 9-18 in. 

 13-25 in. 

 7-39 in. 

 35-152 mm. 

 16-22 in. 

 32-75 mm. 

 SH-i9H in. 

 3M-233^ in. 



Plasmat 22 



Radar 51 



Double protar 13 

 Protar 10 



33a 

 Tessar 44 

 71 

 Homocentric 33 

 Half of protar 13 

 Biotar 39 

 Cooke 27 

 Tessar 44 



Aero 



Convertible 

 Wide angle 



Aero wide angle 

 Photomicrography 

 Portrait 

 Process 

 Landscape 

 Cine 35 mm. 

 Portrait 

 Cine, min. eam. 

 10 & 12 in. for aero 

 General, photomicro- 

 graphy 



Beck. R. and J. Beck, Ltd., 69 Mortimer St., London W.I., England. 



Bystigmar. . . . 

 Cine lens. . . . 

 Isostigmar . , 

 Isostigmar 1 . . . 

 Isostigmar 6. . , 

 Isostigmar 2 .. . 

 Isostigmar 4. . . 

 Isostigmar la . . 

 Isostigmar 3 . . . 

 Isostigmar 5. . . 

 Neostigmar 1 . . 

 Neostigmar 2. . 

 Neostigmar 3 . . 

 Robin Hill lens 



11 



4. 



6 



7. 

 22 



60 

 41 

 60 

 60 

 54 

 70 

 90 

 62 

 65 



60 



70 



62 



180 



4i.2'-ll in. 

 1 . 6-3 in. 

 2-8 in. 

 3-12 in. 

 9M-17 in. 

 3-8 in. 

 31-^-19 in. 

 9-19 in. 

 4>.2'-9 in. 



5-8,1-2 in. 

 5-8 in. 

 5-101^ in. 



13 



72 

 72 

 72 

 72 

 72 

 72 

 72 

 72 

 28 

 28 

 28 

 66 



Convertible 

 Cine 35 mm. 



Process 



Sky lens 



Boyer. Les ^fitablissements Boyer, 25 Blvd. Arago, Paris (13e). 



Beryl . 

 Opale. 

 Perle. . 

 Rubis . 

 Saphir 

 Saphir 



6.8 

 4.5 

 9 



.5-4. 

 1.4 

 1.9 



85 

 56 

 105 

 30 

 45 

 45 



5-25 cm. 

 5—50 cm. 

 60-145 mm. 

 30-70 cm. 

 15-100 mm. 

 15-100 mm. 



Dagor 12 



Cooke 27 

 6 piece 



Convertible 

 Portrait, soft 

 Wide angle 

 Portrait 

 Cine, min. cam. 



