Engineering:Kodak S-mount

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Short description: Ciné lens mount
15 mm f/2.7 Kodak Anastigmat wide angle lens, in native "P-mount" for Ciné-Kodak Special cameras, with a flip-up lens for that camera's built-in reflex viewfinder.

The S-mount ciné lens mount was originally developed by Kodak and introduced in 1933 for the Ciné-Kodak line of movie cameras. The only camera body sold by Kodak with a native S-mount was the Ciné-Kodak Special II.[1]

Characteristics and applications

According to historian Doug Kerr, the S-mount was developed and released in 1933 to simplify the profusion of lens mounts for the line of Ciné-Kodak 16 and 8 mm movie cameras; at the time, many of the lens mounts were unique to the particular camera model, and the line of Kodak ciné lenses for 16 mm cameras spanned a range of focal lengths from 15 to 152 mm. It was not efficient to maintain an adequate stock of optically identical lenses with multiple mounts.[2]: 4  The S-mount uses a mixture of bayonet and threaded attachments; a locating pin on the lens fits into a matching slot on the camera body or adapter to ensure proper rotational orientation, and then a captive, threaded collar on the camera or adapter is rotated to engage corresponding threads on the lens, securing it.[2]: 5 

Kodak adaptors for S-mount Ciné-Kodak lenses[1][2][3]
Lens focal
length(s)
Camera
15 25, 40, 50, 63 50, 63, 102 152
Ciné-Kodak Model K H R[lower-alpha 1] J
Model E (f/1.9) A N/A
Magazine Ciné-Kodak
Magazine Ciné-Kodak Eight, Model 90 		M
Ciné-Kodak Special G P F
Ciné-Kodak Special II N/A (native)
C mount
(incl. Cine-Kodak K-100) 		C
D mount
(incl. Ciné-Kodak Reliant, Medallion) 		D

Although the S-mount was introduced in 1933,[4]: 20  it was not fitted natively to a camera until the Ciné-Kodak Special II, which was manufactured from 1948 to 1961. S-mount lenses can be fitted to other ciné cameras using the appropriate adapter; for example, the 25 mm S-mount lens can be mounted on a Ciné-Kodak Special using a Type P adapter. For the Ciné-Kodak Special and Ciné-Kodak Model K, since the front part of the viewfinder is built into the lens mount,[4]: 22–23  there are multiple adapters which have identical mechanical interfaces, but carry different sets of viewfinder optics and mask(s).[2]: 7–9, 17  Other cameras, including the Ciné-Kodak Special II, made the front viewfinder optics a separate accessory bundled with the lens.[4]: 23 

List of lenses

Lenses released by Kodak for Ciné-Kodak cameras include:

Kodak lenses for Ciné-Kodak 16 mm and 8 mm cameras[3][5][6]
F.L. (mm) Name Aperture Constr.[7] Min. focus Angle of view[lower-alpha 2][7] 8 mm[lower-alpha 3] 16 mm[lower-alpha 4] S-mount[lower-alpha 5] Filter[8] Notes
9 Ektanon f/2.7 ? 4 ft (1.2 m) 25.9° × 19.6°[lower-alpha 6] Yes No Yes Ser.V
13 Ektanon f/1.9 ? 24 in (0.61 m) 19.4° × 14.6°[lower-alpha 6] Yes No No Ser.VI Kit lens with many Ciné-Kodak Eights
Anastigmat f/1.9 4e/4g Yes No No Ser.V Earlier lens
Anastigmat f/2.7 3e/3g fixed 18.7° × 14.1°[lower-alpha 6] Yes No No ?
Anastigmat f/3.5 3e/3g fixed 19.7° × 14.9°[lower-alpha 6] Yes No No ?
15 Ektar f/2.5 ? 6 in (0.15 m) 34.0° × 25.7° No Yes Yes Ser.VI
Ektanon f/2.7 ? No Yes Yes
Anastigmat 3e/3g No Yes No Earlier lens; some marked as ​3⁄4-in. Fixed-focus version takes Series V filters.
25 Ektar f/1.4 7e/4g
(Double Gauss) 		12 in (0.30 m) 21.5° × 16.2°[lower-alpha 7] Yes Yes Yes Ser.VI
Ektar f/1.9 ? Yes Yes Yes Later lens
Anastigmat 4e/4g 2 ft (0.6 m) No Yes No Ser.V Earlier lens; some marked as 1-in.
38 Ektanon f/2.5 ? 12 in (0.30 m) 6.6° × 5.0°[lower-alpha 6] Yes No Yes ?
Anastigmat 4e/2g 24 in (0.61 m) Yes No No ? Earlier lens; some marked as 1​1⁄2-in.
Ektanon f/2.8 ? 6.5° × 4.8°[lower-alpha 6] Yes No No ? D-mount lens
40 Ektar f/1.6 ? 2 ft (0.6 m) 13.7° × 10.3° Yes Yes Yes Ser.VI
50 Ektanon f/1.6 ? 2 ft (0.6 m) 10.8° × 8.1°[lower-alpha 8] Yes Yes Yes Ser.VI
Anastigmat 4e/2g Yes Yes No Earlier lens
Anastigmat f/3.5 3e/3g
(Cooke triplet) 		2 1⁄4 ft (0.7 m) 10.9° × 8.1°[lower-alpha 9] Yes Yes No Ser.V Earlier lens; some marked as 2-in.
63 Ektar f/2.0 ? 2 ft (0.6 m) 8.7° × 6.5°[lower-alpha 10] Yes Yes Yes Ser.VI
Ektanon f/2.7 ? 1 ft (0.3 m) Yes Yes Yes
Anastigmat f/2.7 4e/2g 1 1⁄2 ft (0.5 m) Yes Yes No Earlier lens, some marked as 2​1⁄2-in.
76 Telephoto Anastigmat f/4.5 4e/2g 3 3⁄4 ft (1.1 m) 7.2° × 5.4°[lower-alpha 11] Yes Yes No Ser.V Earlier lens, some marked as 3-in.
78 Telephoto Anastigmat f/4.5 ? 3 3⁄4 ft (1.1 m) 7.2° × 5.4° No Yes No Ser.VI Model B only
102 Ektar f/2.7 4e/2g 3 ft (0.9 m) 5.4° × 4.1° No Yes Yes Ser.VI
Ektanon 2 ft (0.6 m) No Yes Yes ?
Anastigmat 4 1⁄2 ft (1.4 m) No Yes No Ser.VII Earlier lens, some marked as 4-in.
114 Telephoto Anastigmat f/4.5 4e/2g 4 1⁄4 ft (1.3 m) 4.8° × 3.6° No Yes No Ser.VI Earlier lens, some marked as 4​1⁄2-in.
152 Ektar f/4.0 ? 6 ft (1.8 m) 3.6° × 2.7° No Yes Yes Ser.VI
Ektanon f/4.5 ? 55 in (1.4 m) No Yes Yes ?
Telephoto Anastigmat 4e/2g 10 ft (3.0 m) No Yes No Ser.VI Earlier lens, some marked as 6-in.
Notes
  1. ↑ For the 25 mm f/1.4 Cine-Ektar lens, the camera required factory modification
  2. ↑ For 16 mm cameras unless otherwise stated
  3. ↑ Designates whether this lens can be used with 8 mm film cameras
  4. ↑ Designates whether this lens can be used with 16 mm film cameras
  5. ↑ Indicates if at least one variant of this lens was produced with a native S-mount
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 With 8 mm cameras
  7. ↑ 9.9° × 7.4° with 8 mm cameras
  8. ↑ 4.9° × 3.7° with 8 mm cameras
  9. ↑ 5.0° × 3.7° with 8 mm cameras
  10. ↑ 4.0° × 3.0° with 8 mm cameras
  11. ↑ 3.3° × 2.5° with 8 mm cameras

References

  1. ↑ 1.0 1.1 "S Mount Movie Lenses (Cine-Kodak Special II Camera & Others)". Jimscamerasseattle.com. http://www.jimscamerasseattle.com/smomole.html. 
  2. ↑ 2.0 2.1 2.2 2.3 Kerr, Douglas A. (April 4, 2019). "The Kodak type S lens mount and the Ciné-Kodak Special". http://dougkerr.net/Pumpkin/articles/Kodak_S-mount_and_CKS1.pdf. 
  3. ↑ 3.0 3.1 "Kodak Cine Ektar Lenses". Eastman Kodak Company. September 1949. https://www.pacificrimcamera.com/rl/01458/01458.pdf. 
  4. ↑ 4.0 4.1 4.2 Kerr, Douglas A. (December 31, 2017). "Lens mounts of Kodak Ciné-Kodak movie cameras". http://dougkerr.net/Pumpkin/articles/Kodak_movie_lens_mounts.pdf. 
  5. ↑ How to Use the Cine-Kodak Special. Eastman Kodak Company. 1937. https://archive.org/details/central-manuals-camcorder_kodak_cine_special_en.pdf. 
  6. ↑ Cine-Kodak Special II Camera [manual]. Eastman Kodak Company. 1956. https://archive.org/details/CineKodakSpecialIICamera1956. 
  7. ↑ 7.0 7.1 Kodak Lens Manual. Eastman Kodak Company. March 1942. pp. 52–59. https://www.pacificrimcamera.com/rl/02337/02337.pdf. Retrieved 5 December 2024. 
  8. ↑ Lens Mount Diameters of Kodak and Graflex Cameras for Selection of Lens Accessories. Eastman Kodak Company. August 1946. p. 14. https://www.pacificrimcamera.com/rl/00191/00191.pdf. Retrieved 5 December 2024. 



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