smc Pentax-M 50mm F/1.7

Standard prime lens • Film era • Discontinued

  • Announced:
  • · 1977
  • Production status:
  • ● Discontinued
  • Country of design:
  • · Japan
  • Original name:
  • · ASAHI OPT. CO. SMC PENTAX-M 1:1.7 50mm
  • Class:
  • · Fast full-frame standard prime lens
  • System:
  • · Pentax K (1975)

Abbreviations

SMC Multi-layer anti-reflection coating is applied to the surfaces of lens elements. This anti-reflection coating increases light transmission, eliminates flare and ghosting, and maintains color consistence among all lens models.
M A manual focus lens with automatic maximum aperture indexing, which is a mechanical system for coupling the lens to the camera's exposure system. More compact and lighter than the standard K-series counterpart, but with no sacrifice in quality of construction, resolution, durability or contrast. Learn more

Model history (5)

■smc Pentax-M 50mm F/1.7A6 - 50.45m⌀49 1977 ●
■smc Pentax-A 50mm F/1.7A6 - 50.45m⌀49 1983 ●
■smc Pentax-F 50mm F/1.7A6 - 50.45m⌀49 1987 ●
■smc Pentax-FA 50mm F/1.7A6 - 50.45m⌀49 1991 ●
■smc Pentax-DA 50mm F/1.8A6 - 50.45m⌀52 2012 ●

Specification

Optical design:
35mm full frame
50mm
F/1.7
6 elements in 5 groups (Double Gauss derivative)
Pentax K [45.5mm]
46.8° (35mm full frame)
On Pentax K APS-C [1.53x] cameras:
35mm equivalent focal length:
76.5mm (in terms of field of view)
35mm equivalent speed:
F/2.6 (in terms of depth of field)
Diagonal angle of view:
31.6°
Diaphragm mechanism:
Diaphragm type:
Automatic
Aperture control:
Aperture ring (Manual settings only)
6 (six)
Focusing:
0.45m
1:6.67
Focusing modes:
Manual focus only
Manual focus control:
Focusing ring
Physical characteristics:
185g
⌀63×31mm
Accessories:
Screw-type 49mm
PH-R49 - Screw-type round
PH-S49 - Clamp-on rectangular
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Sources of data

  • Manufacturer's technical data.
  • Asahi Pentax series lenses and accessories booklet (PUB. 06771, 60 pages).
  • smc Pentax-A lenses operating manual.
  • Honeywell Hot Line Newsletter.
  • Pentax LX booklet (PUB. 06511).
  • Asahi Pentax MX booklet (PUB. 06241).
  • Asahi Pentax MX booklet (PUB. 06241) (March 1981).
  • Pentax MV booklet (PUB. 06021).
  • Pentax MV1 booklet (PUB. 06036).
  • Pentax MG booklet (PUB. 06221) (July 1983).
  • Pentax LX booklet (PUB. 06506) (April 1981).
  • The many eyes of Pentax booklet (PUB. 06071).
  • Pentax cameras booklet (PUB. 06091, 32 pages).
  • Asahi Pentax ME booklet (PUB. 06006).
  • Pentax ME Super booklet (PUB. 06731).
  • Asahi Pentax smc Pentax lenses booklet.
  • Pentax lenses and accessories booklet (PUB. 06771) (April 1983).
  • Pentax lenses and accessories booklet (PUB. 08051).
  • Pentax lenses & accessories - A Comprehensive and Versatile Photographic System booklet.
  • Pentax ME Super booklet (PUB. 06726) (March 1981).

Manufacturer description #1

Although approximately 1/2 stop slower than the 50mm f/1.4 lens, SMC Pentax-M 50mm f/1.7 is still considered very fast and is even more compact than the f/1.4 lens. An excellent choice for a person seeking a lens with the speed for low-light versatility at a moderate price. Its small size also gives it added convenience when used in conjunction with close-up accessories.

Manufacturer description #2

An excellent choice for those seeking both compactness and high speed combined in a single lens. It is more than a full stop faster than the SMC Pentax-M 40mm f/2.8 lens, as well as 16% shorter and 20% lighter than the SMC Pentax-M 50mm f/1.4 lens.

Manufacturer description #3

Combines Speed and Small Size. Less than 1 1/4 inches long and weighing 6 1/2 ounces, this sharp, compact lens is 20% lighter than the SMC Pentax-M 50mm f/ 1.4. Construction is 6 elements in 5 groups. Closest focusing distance is 18 inches and angle of view is 46°.

Pentax-M series

The second generation of lenses designed for Asahi Pentax 35mm SLR cameras with bayonet mount. Introduced with Asahi Pentax ME and MX in 1976.

  • Miniaturized lenses with average 20% less weight and length than their standard SMC counterparts, but with no sacrifice in quality of construction, resolution, durability or contrast;
  • Robust, all-metal design with recessed focusing distance scale;
  • Fully automatic diaphragm;
  • Support for TTL open-aperture metering;
  • Extremely accurate manual focusing with rubberized focusing ring;
  • Multi-layer anti-reflection coating.

Other standard prime lenses in the Pentax K system

■Pentax K mount (10)
smc Pentax-M 50mm F/2A5 - 50.45m⌀49 1979 ●
smc Pentax-A 50mm F/2A5 - 50.45m⌀49 1985 ●
smc Pentax-A 50mm F/1.7A6 - 50.45m⌀49 1983 ●
smc Pentax 50mm F/1.4A7 - 60.45m⌀52 1975 ●
smc Pentax-M 50mm F/1.4A7 - 60.45m⌀49 1977 ●
smc Pentax-A 50mm F/1.4A7 - 60.45m⌀49 1983 ●
smc Pentax 50mm F/1.2A7 - 60.45m⌀52 1975 ●
smc Pentax-A 50mm F/1.2A7 - 60.45m⌀52 1983 ●
smc Pentax 55mm F/2A6 - 50.45m⌀52 1976 ●
smc Pentax 55mm F/1.8A6 - 50.45m⌀52 1975 ●

Lenses with similar focal length

■Pentax K mount (35)
Chinon Auto 50mm F/1.9
akaAgfa Color 50mm F/1.9 Coated
akaRevuenon Auto 50mm F/1.9		A5 - ?0.45m⌀49 ●
Chinon Auto 50mm F/1.4 [Multi-Coated]
akaAgfa Color 50mm F/1.4 Multi-Coated
akaRevuenon Auto 50mm F/1.4 MC		A7 - 60.45m⌀49 1979 ●
Chinon Auto 50mm F/1.7 [Multi-Coated]
akaAgfa Color 50mm F/1.7 Multi-Coated
akaRevuenon Auto 50mm F/1.7 MC		A? - ?0.45m⌀49 1979 ●
Cima Kogaku AM Topcor 55mm F/1.7 [MC]
akaEdixar 55mm F/1.7 MC
akaExaktar 55mm F/1.7 MC		A6 - 40.60m⌀52 1978 ●
Cosina 55mm F/1.2 MC
akaRevuenon 55mm F/1.2 MC		A7 - 60.60m⌀58 ●
Cosina Cosinon Auto 45mm F/2.8 MC
akaAuto Chinon 45mm F/2.8
akaRevuenon Auto 45mm F/2.8		A? - ?0.60m⌀49 1979 ●
Cosina Cosinon Auto 55mm F/2.1
akaVivitar Auto 55mm F/2.1		A4 - 40.60m⌀49 ●
Cosina Cosinon-S 50mm F/1.8
akaPetri 50mm F/1.8		A6 - 50.50m⌀49 1981 ●
Cosina Cosinon-S 50mm F/2
akaCasio 50mm F/2
akaMiranda 50mm F/2
akaPetri 50mm F/2
akaPorst Color Reflex Auto 50mm F/2 MC F
akaSoligor 50mm F/2
akaVivitar Auto 50mm F/2		A6 - 50.50m⌀49 1979 ●
Cosina [Auto] Cosinon-S 50mm F/1.7 MC
akaBauer Neovaron 50mm F/1.7 Multicoated
akaPetri 50mm F/1.7 MC
akaPorst Color Reflex Auto 50mm F/1.7 MC F		A6 - 50.50m⌀49 1978 ●
Cosina [Auto] Cosinon-S 50mm F/1.4 MC
akaBauer Neovaron 50mm F/1.4 Multicoated
akaPetri 50mm F/1.4 MC
akaPorst Color Reflex Auto 50mm F/1.4 MC G
akaVivitar Auto 50mm F/1.4 VMC		A7 - 60.50m⌀49 1978 ●
Irix 45mm F/1.4 SLRA11 - 90.40m⌀77 2020 ●
Ricoh XR Rikenon 50mm F/1.4A7 - 60.45m⌀52 1977 ●
Ricoh XR Rikenon 50mm F/1.7 [I]A6 - 50.45m⌀52 1977 ●
Ricoh XR Rikenon 50mm F/2A6 - 50.45m⌀52 1977 ●
Ricoh XR Rikenon 55mm F/1.2A7 - 60.60m⌀58 ●
Ricoh Riconar 55mm F/2.2A4 - 40.80m⌀52 1978 ●
Ricoh Rikenon 50mm F/2A6 - 50.60m⌀52 1982 ●
Ricoh XR Rikenon 55mm F/2.2A4 - 40.80m⌀52 1980 ●
Ricoh XR Rikenon 45mm F/2.8 • Pancake lensA4 - 30.60m⌀52 1994 ●
Ricoh XR Rikenon 50mm F/2 LA6 - 50.60m⌀52 1980 ●
Ricoh XR Rikenon 50mm F/2 SA6 - 50.60m⌀52 1981 ●
Ricoh XR Rikenon 50mm F/1.7 [II]A6 - 50.60m⌀52 1981 ●
Ricoh Rikenon P 55mm F/1.2A7 - 60.60m⌀58 ●
Ricoh Rikenon P 50mm F/1.4A7 - 60.45m⌀52 1985 ●
Ricoh Rikenon P 50mm F/1.7A6 - 50.60m⌀52 1984 ●
Ricoh Rikenon 50mm F/1.7A6 - 50.60m⌀52 1982 ●
Ricoh Rikenon P 50mm F/2A6 - 50.60m⌀52 1984 ●
Helios-77K-4 50mm F/1.8 [MC]
akaГЕЛИОС-77К-4 50mm F/1.8 МС		A6 - 40.45m⌀52 ●
Volna 50mm F/1.8 MC
akaВОЛНА 50mm F/1.8 МС		A6 - ?0.45m⌀46 1980 ●
Zenitar 50mm F/2 MCA6 - 40.35m⌀46 1995 ●
Zenitar-K 50mm F/1.9 MC
akaЗЕНИТАР-К 50mm F/1.9 МС		A6 - 40.45m⌀52 1991 ●
Vivitar Series 1 55mm F/1.2 VMCA7 - 60.60m⌀58 1984 ●
Porst Color Reflex Auto 55mm F/1.2 MC FA6 - 40.50m⌀55 ●
Carl Zeiss Classic Planar T* 50mm F/1.4 ZE / ZF.2 / ZK / ZSA7 - 60.45mE58 2006 ●
■Interchangeable mount (1)
MS Optics MS-Mode-S 50mm F/1.3 Dualsystem (200 units)M5 - 41.00m⌀49 2006 ●

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