Convertible
Maker Model Focal Length (in) Focal Length (mm) F/Stop Angle of View Image Circle (mm) Coverage Wide Open
 Coverage Stopped Down
 Coverage (1:1) Comments Source Barrel Shutter Variable Diffusion Coated
B&L Zeiss Convertible 24 600 6.3




"42""" 3 No No No Yes
Beck Bystigmar Series II 11
6

8 1/2 x 6 1/2

Front 19 - Rear 19 20 Yes No No No
Beck Bystigmar Series II 4 1/2
6

3 1/2 x 2 1/2

Front 8 - Rear 8 20 Yes No No No
Beck Bystigmar Series II 5
6

4 1/4 x 3 1/4

Front 8 - Rear 9 1/2 20 Yes No No No
Beck Bystigmar Series II 5 1/2
6

5 x 4

Front 9 1/2 - Rear 9 1/2 20 Yes No No No
Beck Bystigmar Series II 6
6

5 1/2 x 3 1/2

Front 9 1/2 - Rear 12 20 Yes No No No
Beck Bystigmar Series II 6 3/4
6

5 1/2 x 3 1/2

Front 12 - Rear 12 20 Yes No No No
Beck Bystigmar Series II 7 1/2
6

6 1/2 x 4 3/4

Front 12 - Rear 15 20 Yes No No No
Beck Bystigmar Series II 8 1/2
6

6 1/2 x 4 3/4

Front 15 - Rear 15 20 Yes No No No
Beck Bystigmar Series II 9 1/2
6

8 1/2 x 6 1/2

Front 15 - Rear 19 20 Yes No No No
Beck Bystigmar Series II - Single Compoents 12
11

8 1/2 x 6 1/2


20 Yes No No No
Beck Bystigmar Series II - Single Compoents 15
11

10 x 8


20 Yes No No No
Beck Bystigmar Series II - Single Compoents 19
11

12 x 10


20 Yes No No No
Beck Bystigmar Series II - Single Compoents 8
11

5 x 4


20 Yes No No No
Beck Bystigmar Series II - Single Compoents 9 1/2
11

6 1/2 x 4 3/4


20 Yes No No No
Crown Optical Co. Crown Anastigmat Series III 10 1/2
6.8

6 1/2 x 8 1/2

Rear used alone is 2x focal length 17 Yes Yes No No
Crown Optical Co. Crown Anastigmat Series III 13
6.8

8 x 10

Rear used alone is 2x focal length 17 Yes Yes No No
Crown Optical Co. Crown Anastigmat Series III 15
6.8

10 x 12

Rear used alone is 2x focal length 17 Yes No No No
Crown Optical Co. Crown Anastigmat Series III 16 1/2
6.8

11 x 14

Rear used alone is 2x focal length 17 Yes No No No
Crown Optical Co. Crown Anastigmat Series III 21
6.8

14 x 17

Rear used alone is 2x focal length 17 Yes No No No
Crown Optical Co. Crown Anastigmat Series III 24
6.8

16 x 20

Rear used alone is 2x focal length 17 Yes No No No
Crown Optical Co. Crown Anastigmat Series III 4 3/8
6.8

2 1/2 x 3 1/2

Rear used alone is 2x focal length 17 Yes Yes No No
Crown Optical Co. Crown Anastigmat Series III 5
6.8

3 1/4 x 4 1/4

Rear used alone is 2x focal length 17 Yes Yes No No
Crown Optical Co. Crown Anastigmat Series III 6
6.8

4 x 5

Rear used alone is 2x focal length 17 Yes Yes No No
Crown Optical Co. Crown Anastigmat Series III 6 7/8
6.8

3 1/4 x 5 1/2

Rear used alone is 2x focal length 17 Yes Yes No No
Crown Optical Co. Crown Anastigmat Series III 7 1/2
6.8

5 x 7

Rear used alone is 2x focal length 17 Yes Yes No No
Crown Optical Co. Crown Anastigmat Series III 8 1/3
6.8

5 x 8

Rear used alone is 2x focal length 17 Yes Yes No No
Darlot Rapid Hemispherical 11 3/8
8

6 1/2 x 8 1/2 8 x 10
Symmetrical - single element = 2X focal length 17 Yes No No No
Darlot Rapid Hemispherical 14 1/2
8

8 x 10 11 x 14
Symmetrical - single element = 2X focal length 17 Yes No No No
Darlot Rapid Hemispherical 17 1/2
8

11 x 14 14 x 17
Symmetrical - single element = 2X focal length 17 Yes No No No
Darlot Rapid Hemispherical 24 1/2
8

14 x 17 17 x 20
Symmetrical - single element = 2X focal length 17 Yes No No No
Darlot Rapid Hemispherical 6 3/8
8

4 x 5 5 x 7
Symmetrical - single element = 2X focal length - available in matched pair for stereo 17 Yes No No No
Darlot Rapid Hemispherical 9 1/4
8

5 x 7 6 182 x 8 1/2
Symmetrical - single element = 2X focal length - available in matched pair for stereo 17 Yes No No No
Goerz Celor Anastigmat Series IB 10 3/4
5

7 x 9 8 x 10
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 12
5.5

8 x 10 10 x 12
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 14
5.5

10 x 12 12x x15
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 16 1/2
5.5

11 x 14 13 x 17
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 19
5.5

12 x 15 16x x18
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 2 3/8
4.5

1 1/2 x 2 1/2 2 x 2 1/2
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 3 1/2
4.8

2 1/2 x 3 1/2 3 x 4
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 4 3/4
4.8

3 1/4 x 4 1/4 4 x 5
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 6
4.8

4 x 5 4 3/4 x 6 1/2
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 7
4.8

4 3/4 x 6 1/2 5 x 8
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 8 1/4
5

5 x 8 6 1/2 x 8 1/2
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Celor Anastigmat Series IB 9 1/2
5

6 1/2 x 8 1/2 7 x 9
Rear used alone is 2x focal length - 2x coverage @f/32 - Max Coverage @ f/16 17 Yes No No No
Goerz Dogmar Anastigmat 10 3/4 270 4.5 45@f/4.5 -
6 1/2 x 8 1/2 7 x 9
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 12 300 4.5 45@f/4.5 -
7 x 9 8 x 10
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 12 300 5.5 45@f/4.5 -
7 x 9 8 x 10
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 14 360 5.5 45@f/4.5 -
8 x 10 10 x 12
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 16 1/2 420 5.5 45@f/4.5 -
10 x 12 11 x 17
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 3 1/8 80 4.5 45@f/4.5 -
1 3/4 x 2 3/8 2 1/4 x 2 3/4
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 4 1/8 105 4.5 45@f/4.5 -
2 x 3 2 1/4 x 3 1/4
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 5 1/2 140 4.5 45@f/4.5 -
3 1/4 x 4 1/4 3 1/2 x 41/2
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 5 1/4 135 4.5 45@f/4.5 -
3 1/4 x 4 1/4 3 1/2 x 41/2
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 6 150 4.5 45@f/4.5 -
3 1/2 x 4 3/4 4 x 5
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 6 1/2 165 4.5 45@f/4.5 -
3 1/4 x 5 1/2 4 x 6
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 7 1/2 195 4.5 45@f/4.5 -
4 1/4 x 6 1/4 5 x 7
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 8 1/4 210 4.5 45@f/4.5 -
5 x 7 5 x 8
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Goerz Dogmar Anastigmat 9 1/2 240 4.5 45@f/4.5 -
5 1/2 x 7 1/2 6 1/2 x 8 1/2
Front cell has a focal length of 1.92 time and the rear cell a focal length of 1.52 time that of the complete lens. May be used separately 30 No Yes No No
Gundlach Convertible Anastigmat 12
6.8 70
7 x 17

No data on front and rear element focal length 28 Yes Yes No No
Gundlach Convertible Anastigmat 15
6.8 70
8 x 20 - 12 x 20

No data on front and rear element focal length 28 Yes Yes No No
Gundlach Hyperion Diffusion Portrait 12
4

6 x1/2 x 8 x1/2

Front Focus: 30 Rear Focus: 18 28 Yes Yes Yes No
Gundlach Hyperion Diffusion Portrait 14
4

8 x 10

Front Focus: 36 Rear Focus: 20 28 Yes Yes Yes No
Gundlach Hyperion Diffusion Portrait 18
4

11 x 14

Front Focus: 36 Rear Focus: 36 28 Yes Yes Yes No
Gundlach Hyperion Diffusion Portrait 7
4

4 x 5

Front Focus: 18 Rear Focus: 10 28 Yes Yes Yes No
Gundlach Hyperion Diffusion Portrait 9
4

5 x 7

Front Focus: 21 Rear Focus: 15 28 Yes Yes Yes No
Gundlach Perigraphic Convertible 12
5.6

8 x 10

Front Focus: 28 Rear Focus: 20 1/2 28 Yes Yes No No
Gundlach Perigraphic Convertible 16
5.6

11 x 14

Front Focus: 34 Rear Focus: 25 1/2 28 Yes Yes No No
Gundlach Perigraphic Convertible 8
5.6

5 x 7

Front Focus: 18 Rear Focus: 13 1/2 28 Yes Yes No No
Gundlach Rapid Rectigraphic Convertible 12
8

8 x 10

Front Focus:28 Rear Foucs: 21 28 Yes Yes No No
Gundlach Rapid Rectigraphic Convertible 18 1/2
8

11 x 14

Front Focus: 3/ 1/2 Rear Focus: 29 1/4 28 Yes Yes No No