# Kodak S-mount

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.

## 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.$^{:4}$ 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.$^{:5}$
Kodak adaptors for S-mount Ciné-Kodak lenses :
| Lens focal length(s)Camera | Lens focal length(s)Camera | 15 | 25, 40, 50, 63 | 50, 63, 102 | 152 |
| Ciné-Kodak | Model K | H | R | J | J |
| Ciné-Kodak | Model E (f/1.9) | A | A | A | — |
| Magazine Ciné-Kodak Magazine Ciné-Kodak Eight, Model 90 | Magazine Ciné-Kodak Magazine Ciné-Kodak Eight, Model 90 | M | M | M | M | M |
| Ciné-Kodak Special | Ciné-Kodak Special | G | P | F | F |
| Ciné-Kodak Special II | Ciné-Kodak Special II | — (native) | — (native) | — (native) | — (native) |
| C mount (incl. Cine-Kodak K-100) | C mount (incl. Cine-Kodak K-100) | C | C | C | C |
| D mount (incl. Ciné-Kodak Reliant, Medallion) | D mount (incl. Ciné-Kodak Reliant, Medallion) | D | D | D | D |
Although the S-mount was introduced in 1933,$^{:20}$ 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,$^{:22–23}$ there are multiple adapters which have identical mechanical interfaces, but carry different sets of viewfinder optics and mask(s).$^{:7–9,17}$ Other cameras, including the Ciné-Kodak Special II, made the front viewfinder optics a separate accessory bundled with the lens.$^{:23}$

### List of lenses

Lenses released by Kodak for Ciné-Kodak cameras include:
Kodak lenses for Ciné-Kodak 16 mm and 8 mm cameras :
| F.L. (mm) | Name | Aperture | Constr. | Min. focus | Angle of view | 8 mm | 16 mm | S-mount | Filter | Notes |
| 9 | Ektanon | f/2.7 | ? | 4 ft (1.2 m) | 25.9° × 19.6° | Yes | No | Yes | Ser.V | |
| 13 | Ektanon | f/1.9 | ? | 24 in (0.61 m) | 19.4° × 14.6° | Yes | No | No | Ser.VI | Kit lens with many Ciné-Kodak Eights |
| 13 | Anastigmat | f/1.9 | 4e/4g | 24 in (0.61 m) | 19.4° × 14.6° | Yes | No | No | Ser.V | Earlier lens |
| 13 | Anastigmat | f/2.7 | 3e/3g | fixed | 18.7° × 14.1° | Yes | No | No | ? | |
| 13 | Anastigmat | f/3.5 | 3e/3g | fixed | 19.7° × 14.9° | Yes | No | No | ? | |
| 15 | Ektar | f/2.5 | ? | 6 in (0.15 m) | 34.0° × 25.7° | No | Yes | Yes | Ser.VI | |
| 15 | Ektanon | f/2.7 | ? | 6 in (0.15 m) | 34.0° × 25.7° | No | Yes | Yes | Ser.VI | |
| 15 | Anastigmat | f/2.7 | 3e/3g | 6 in (0.15 m) | 34.0° × 25.7° | No | Yes | No | Ser.VI | 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° | Yes | Yes | Yes | Ser.VI | |
| 25 | Ektar | f/1.9 | ? | 12 in (0.30 m) | 21.5° × 16.2° | Yes | Yes | Yes | Ser.VI | Later lens |
| 25 | Anastigmat | f/1.9 | 4e/4g | 2 ft (0.6 m) | 21.5° × 16.2° | 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° | Yes | No | Yes | ? | |
| 38 | Anastigmat | f/2.5 | 4e/2g | 24 in (0.61 m) | 6.6° × 5.0° | Yes | No | No | ? | Earlier lens; some marked as 11⁄2-in. |
| 38 | Ektanon | f/2.8 | ? | 24 in (0.61 m) | 6.5° × 4.8° | 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° | Yes | Yes | Yes | Ser.VI | |
| 50 | Anastigmat | f/1.6 | 4e/2g | 2 ft (0.6 m) | 10.8° × 8.1° | Yes | Yes | No | Ser.VI | Earlier lens |
| 50 | Anastigmat | f/3.5 | 3e/3g (Cooke triplet) | 2+1⁄4 ft (0.7 m) | 10.9° × 8.1° | 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° | Yes | Yes | Yes | Ser.VI | |
| 63 | Ektanon | f/2.7 | ? | 1 ft (0.3 m) | 8.7° × 6.5° | Yes | Yes | Yes | Ser.VI | |
| 63 | Anastigmat | f/2.7 | 4e/2g | 1+1⁄2 ft (0.5 m) | 8.7° × 6.5° | Yes | Yes | No | Ser.VI | Earlier lens, some marked as 21⁄2-in. |
| 76 | Telephoto Anastigmat | f/4.5 | 4e/2g | 3+3⁄4 ft (1.1 m) | 7.2° × 5.4° | 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 | |
| 102 | Ektanon | f/2.7 | 4e/2g | 2 ft (0.6 m) | 5.4° × 4.1° | No | Yes | Yes | ? | |
| 102 | Anastigmat | f/2.7 | 4e/2g | 4+1⁄2 ft (1.4 m) | 5.4° × 4.1° | 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 41⁄2-in. |
| 152 | Ektar | f/4.0 | ? | 6 ft (1.8 m) | 3.6° × 2.7° | No | Yes | Yes | Ser.VI | |
| 152 | Ektanon | f/4.5 | ? | 55 in (1.4 m) | 3.6° × 2.7° | No | Yes | Yes | ? | |
| 152 | Telephoto Anastigmat | f/4.5 | 4e/2g | 10 ft (3.0 m) | 3.6° × 2.7° | No | Yes | No | Ser.VI | Earlier lens, some marked as 6-in. |

#### Notes

* ↑ For the 25 mm f/1.4 Cine-Ektar lens, the camera required factory modification
* ↑ For 16 mm cameras unless otherwise stated
* ↑ Designates whether this lens can be used with 8 mm film cameras
* ↑ Designates whether this lens can be used with 16 mm film cameras
* ↑ Indicates if at least one variant of this lens was produced with a native S-mount
* 1 2 3 4 5 6 With 8 mm cameras
* ↑ 9.9° × 7.4° with 8 mm cameras
* ↑ 4.9° × 3.7° with 8 mm cameras
* ↑ 5.0° × 3.7° with 8 mm cameras
* ↑ 4.0° × 3.0° with 8 mm cameras
* ↑ 3.3° × 2.5° with 8 mm cameras