SMC PENTAX-A 1: 1.7 50mm

Main technical characteristics of SMC PENTAX-A 1:1.7 50mm:

Name	SMC PENTAX-A 1:1.7 50mm + serial number
Basic properties	SMC (Super Multi Coated) - special super-multi coated optics A – possibility of full automatic iris control Bayonet mount Pentax K manual focus only. aperture control ring lens suitable for full-frame cameras compact sizes 20897 – lens model marker
Front Filter Diameter	49 mm, metal thread for filters
Focal length	50 mm On Pentax cameras with APS-C sensor EGF lens equals 75mm
Zoom ratio	1 x
Designed by	for film cameras with a frame size of 24 x 36 mm
Number of aperture blades	6 petals
Tags	focusing distance scale in meters (yellow) and feet (blue) depth of field scale for f/4, 5.6 (strip only), 8, 11 (strip only), 16, 22 red label-stripe for working in the infrared spectrum white/yellow raised dot for easy lens orientation red bayonet attachment point (on the side of the bayonet tabs) green letter 'A' on the iris control ring to switch to automatic mode
Diaphragm	from F/1.7 to F/22. The lens has an aperture control ring. The ring has markings for f/1.7, 2.8, 4, 5.6, 8, 11, 16, 22 + a green letter 'A' on the aperture control ring to switch to auto mode. The aperture ring rotates with clicks.
MDF	0.45 m, maximum magnification ratio 1: 6.7.
The weight	165 grams
Optical design	6 elements in 5 groups The lens does not use special optical elements in its optical design. The same optical design is used by other lenses of the class Pentax 50 / 1.7.
Lens hood	Threaded, screwed into the front filter thread
Manufacturer country	JAPAN (lens made in Japan)
Period	From 1984 to 1989. In 1987 supplemented with autofocus version of SMC PENTAX-F 1:1.7 50mm.
Price	About 50 cu for used option.

Appearance

All major versions of similar lenses Asahi Opt. Co., Takumar / Pentax:

1.2/50

1. SMC PENTAX 1: 1.2 / 50 ASAHI OPT. CO., JAPAN (7/6, 20947, 1975-1984)
2. SMC PENTAX 1:1.2/50 ASAHI OPT. CO.,JAPAN'GOLD' (7/6, 1981)
3. SMC PENTAX-A 1: 1.2 50mm (7/6, 20987, 1984-2004)
4. SMC PENTAX-A 1: 1.2 50mm Special (7/6, 2000)

1.4 / 50 (video)

1. Super takumar 1: 1.4 / 50 Asahi Opt. Co., Lens made in Japan (8/6, 358, 1964-1966)
2. Super takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in japan (7/6, 37800, 1965-1971, F/2 in number)
3. Super takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in japan (7/6, 37801, 1965-1971, F/2 dot)
4. Super takumar 1: 1.4 / 50 Asahi Opt. Co., Lens made in Japan (7/6, 37802, 1965-1971, comma after 'CO.')
5. Super-Multi Coated TAKUMAR 1: 1.4 / 50 ASAHI OPT. CO., JAPAN (7/6, 37902, 1971-1972)
6. SMC TAKUMAR 1: 1.4 / 50 ASAHI OPT. CO., JAPAN (7/6, 37908, 1972-1975)
7. SMC PENTAX 1: 1.4 / 50 ASAHI OPT. CO., JAPAN (7/6, 20847, 1975-1977)
8. SMC PENTAX-M 1: 1.4 50mm ASAHI OPT. CO., JAPAN (7/6, 20867, 1977-1984)
9. SMC PENTAX-A 1: 1.4 50mm (7/6, 20887, 1984-1989)
10. SMC PENTAX-F 1: 1.4 50mm (7/6, 20827, 1987-1991)
11. SMC PENTAX-FA 1: 1.4 50mm (7/6, 20817, 1991-2023)
12. HD PENTAX-D FA * 1: 1.4 50mm SDMAW (15/9, 21260, 2018->)
13. SMC PENTAX-FA 1: 1.4 50mm Classic (7/6, 2023->)
14. HD PENTAX-FA 1: 1.4 50mm (7/6, 2023->)

1.8 / 55 (video)

1. takumar 1:1.8 f=55mm Asahi OPT. CO., Japan (6/5, 1958, zebra)
2. Auto-takumar 1:1.8 f=55mm Asahi OPT. CO., Japan (6/5, 1958-1960, zebra)
3. Auto-takumar 1:1.8/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1960, with 'R')
4. Auto-takumar 1:1.8/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1960-1962, no 'R', oblique lines of the depth of field)
5. Auto-takumar 1:1.8/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1962, no 'R', straight lines of depth of field)
6. Super takumar 1: 1.8 / 55 Asahi Opt. Co., Lens made in Japan (6/5, 1962, fine ribs, f/1.8 left)
7. Super takumar 1: 1.8 / 55 Asahi Opt. Co., Lens made in Japan (6/5, before 1965, fine ribs, f/1.8 right)
8. Super takumar 1: 1.8 / 55 Asahi Opt. Co. Lens made in japan (6/5, 37106, before 1971, large ribs)
9. Super-Multi Coated TAKUMAR 1: 1.8 / 55 ASAHI OPT. CO., JAPAN (6/5, 37104, 1971-1972)
10. SMC TAKUMAR 1: 1.8 / 55 ASAHI OPT. CO., JAPAN (6/5, 37108, 1972-1975)
11. SMC PENTAX 1: 1.8 / 55 ASAHI OPT. CO., JAPAN (6/5, 20747, 1975-1977)

2 / 55 (1.9 / 55)

1. Auto-takumar 1:1.9 f=55mm Asahi Opt. Co.,Japan (6/5, 1958-1959)
2. Auto-takumar 1: 2 f = 55mm Asahi Opt. Co., Japan (6/5, 1958-1959, zebra)
3. Auto-takumar 1: 2 f = 55mm Asahi Opt. Co., Japan (6/5, 34100, 1958-1959)
4. Super takumar 1: 2 / 55 Asahi Opt. Co., Lens made in Japan (6/5, small fins, F/2 left)
5. Super takumar 1: 2 / 55 Asahi Opt. Co., Lens made in Japan (6/5, small ribs, F/2 on the right)
6. Super takumar 1: 2 / 55 Asahi Opt. Co. Lens made in japan (6/5, 37103, 1962-1973, large ribs)
7. Super takumar 1: 2 / 55 Asahi Opt. Co. Lens made in japan (6/5, 37107, additional aperture pins)
8. SMC TAKUMAR 1: 2 / 55 ASAHI OPT. CO., JAPAN (6/5, 37109, 1973-1975)
9. SMC PENTAX 1: 2 55mm ASAHI OPT. CO., JAPAN (6/5, 1976-1977)

1.7/50

1. SMC PENTAX-M 1: 1.7 50mm ASAHI OPT. CO., JAPAN (6/5, 20877, 1977-1984)
2. SMC PENTAX-A 1: 1.7 50mm (6/5, 20897, 1984-1989)
3. SMC PENTAX-F 1: 1.7 50mm (6/5, 20837, 1987-1991)
4. SMC PENTAX-FA 1: 1.7 50mm (6/5, 20907, 1991-2004)

2/50

1. SMC PENTAX-M 1:2 50mm ASAHI OPTICAL CO. (5/5, 20677, 1979-1985)
2. SMC PENTAX-A 1: 2 50mm (5/5, 20697, 1985-1998)

2.2/55

1. takumar 1:2.2/55 Asahi Opt. CO., Japan (6/5, 1961-1963)
2. Auto-takumar 1:2.2/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1961-1963)

2/58

1. takumar 1:2 f=58mm Asahi Opt. Co., Japan (6/4, 1957-1958)
2. takumar 1: 2 f = 58mm Asahi Opt. Co., Japan (6/4, 1957-1958, labeled 'R')

DA (APS-C: 1.4/55 DA* + 1.8/50 DA)

1. SMC PENTAX-DA * 1: 1.4 55mm SDM (9/8, 21790, 2008->)
2. SMC PENTAX-DA 1: 1.8 50mm (6/5, 22177, 2012->)

Asahi-Kogaku (M37x1, 3.5/50 + 2.4/58 -> M42)

1. takumar 1: 3,5 f = 50mm Asahi-kogaku (4/3, 1952, M37×1)
2. takumar 1: 3.5 f = 50mm Asahi-kogaku (4/3, 1952, , M37×1, pre-set)
3. takumar 1: 2.4 f = 58mm Asahi-kogaku (5/3, 1954, M37×1, silver)
4. takumar 1: 2.4 f = 58mm Asahi Opt. Co., Japan (5/3, 1957-1958, M42)

The lens names in this list correspond exactly to the lens name label on the lens barrel (except for the serial number and/or filter diameter).

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Material prepared Arkady Shapoval. Training/Consultations | Youtube | Facebook | Instagram | Twitter | Telegram