Kodak S-mount

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

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:

More information F.L. (mm), Name ...

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[b][7]	8 mm[c]	16 mm[d]	S-mount[e]	Filter[8]	Notes
9	Ektanon	f/2.7	?	4 ft (1.2 m)	25.9° × 19.6°[f]	Yes	No	Yes	Ser.V
13	Ektanon	f/1.9	?	24 in (0.61 m)	19.4° × 14.6°[f]	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°[f]	Yes	No	No	?
	Anastigmat	f/3.5	3e/3g	fixed	19.7° × 14.9°[f]	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°[g]	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°[f]	Yes	No	Yes	?
	Anastigmat		4e/2g	24 in (0.61 m)		Yes	No	No	?	Earlier lens; some marked as 11⁄2-in.
	Ektanon	f/2.8	?		6.5° × 4.8°[f]	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°[h]	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°[i]	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°[j]	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 21⁄2-in.
76	Telephoto Anastigmat	f/4.5	4e/2g	3+3⁄4 ft (1.1 m)	7.2° × 5.4°[k]	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 41⁄2-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.

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Notes

1. [a]

   For the 25 mm f/1.4 Cine-Ektar lens, the camera required factory modification
2. [b]

   For 16 mm cameras unless otherwise stated
3. [c]

   Designates whether this lens can be used with 8 mm film cameras
4. [d]

   Designates whether this lens can be used with 16 mm film cameras
5. [e]

   Indicates if at least one variant of this lens was produced with a native S-mount
6. [f]

   With 8 mm cameras
7. [g]

   9.9° × 7.4° with 8 mm cameras
8. [h]

   4.9° × 3.7° with 8 mm cameras
9. [i]

   5.0° × 3.7° with 8 mm cameras
10. [j]

    4.0° × 3.0° with 8 mm cameras
11. [k]

    3.3° × 2.5° with 8 mm cameras