smc Pentax-M 28mm F/2.8 [I]

Wide-angle prime lens • Film era • Discontinued

Announced:
· 1977
Production status:
● Discontinued
Country of design:
· Japan
Original name:
· ASAHI OPT. CO. SMC PENTAX-M 1:2.8 28mm
Class:
· Fast full-frame wide-angle 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 28mm F/2.8 [I]	A	7 - 7	0.30m	⌀49	1977 ●
■smc Pentax-M 28mm F/2.8 [II]	A	7 - 7	0.30m	⌀49	1982 ●
—Takumar Bayonet 28mm F/2.8					1984 ●
■smc Pentax-A 28mm F/2.8	A	7 - 7	0.30m	⌀49	1983 ●
—Takumar-A 28mm F/2.8					1984 ●
■smc Pentax-F 28mm F/2.8	A	7 - 7	0.30m	⌀49	1987 ●
■smc Pentax-FA 28mm F/2.8 AL	A	5 - 5	0.30m	⌀49	1991 ●

Specification

Optical design:
Maximum format:	35mm full frame
Focal length:	28mm
Speed:	F/2.8
Lens construction:	7 elements in 7 groups
Mount and Flange focal distance:	Pentax K [45.5mm]
Diagonal angle of view:	75.4° (35mm full frame)
On Pentax K APS-C [1.53x] cameras:
35mm equivalent focal length:	42.8mm (in terms of field of view)
35mm equivalent speed:	F/4.3 (in terms of depth of field)
Diagonal angle of view:	53.6°
Diaphragm mechanism:
Diaphragm type:	Automatic
Aperture control:	Aperture ring (Manual settings only)
Number of blades:	5 (five)
Focusing:
Closest focusing distance:	0.30m
Magnification ratio:	1:7.7
Focusing modes:	Manual focus only
Manual focus control:	Focusing ring
Physical characteristics:
Weight:	156g
Maximum diameter x Length:	⌀63×31mm
Accessories:
Filters:	Screw-type 49mm
Lens hood:	PH-S49 - Clamp-on rectangular
Teleconverters:	<No data>

Sources of data

Manufacturer's technical data.
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 LX booklet (PUB. 06506) (April 1981).
The many eyes of Pentax booklet (PUB. 06071).
Asahi Pentax ME booklet (PUB. 06006).
Pentax ME Super booklet (PUB. 06731).
Asahi Pentax smc Pentax lenses booklet.
Pentax lenses and accessories booklet (PUB. 08051).
Pentax ME Super booklet (PUB. 06726) (March 1981).

Manufacturer description #1

The ideal wide-angle lens for the photographer for whom light weight and compactness are of prime importance. At 156g it is the second lightest in weight and shares the same 49mm filter size as the SMC Pentax-M standard lenses.

Manufacturer description #2

The "Classic" Wide-Angle Lens. Weighs only 5 1/2 ounces and is less than 1 1/4 inches long. This short-barrel retrofocus lens has a 7-group, 7-element construction, and 75° angle of view. It focuses down to less than 1 foot.

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 wide-angle prime lenses in the Pentax K system

■Pentax K mount (18)
smc Pentax 24mm F/3.5	A	9 - 8	0.25m	⌀58	1975 ●
smc Pentax 24mm F/2.8	A	9 - 8	0.25m	⌀52	1977 ●
smc Pentax-A 24mm F/2.8	A	9 - 8	0.25m	⌀52	1983 ●
smc Pentax 28mm F/3.5	A	8 - 7	0.30m	⌀52	1976 ●
smc Pentax-M 28mm F/3.5	A	6 - 6	0.30m	⌀49	1977 ●
smc Pentax-M 28mm F/2.8 [II]	A	7 - 7	0.30m	⌀49	1982 ●
smc Pentax-A 28mm F/2.8	A	7 - 7	0.30m	⌀49	1983 ●
smc Pentax 28mm F/2	A	9 - 8	0.30m	⌀52	1976 ●
smc Pentax-M 28mm F/2	A	8 - 7	0.30m	⌀49	1980 ●
smc Pentax-A 28mm F/2	A	8 - 7	0.30m	⌀49	1983 ●
smc Pentax 30mm F/2.8	A	7 - 7	0.30m	⌀52	1975 ●
smc Pentax 35mm F/3.5	A	5 - 4	0.35m	⌀52	1975 ●
smc Pentax-M 35mm F/2.8	A	6 - 6	0.30m	⌀49	1977 ●
smc Pentax-A 35mm F/2.8	A	6 - 6	0.30m	⌀49	1983 ●
smc Pentax 35mm F/2	A	8 - 7	0.35m	⌀52	1975 ●
smc Pentax-M 35mm F/2	A	7 - 7	0.30m	⌀49	1977 ●
smc Pentax-A 35mm F/2	A	7 - 7	0.30m	⌀49	1983 ●
smc Pentax-M 40mm F/2.8 • Pancake lens	A	5 - 4	0.60m	⌀49	1976 ●

Lenses with similar focal length

■Pentax K mount (60)
Chinar 28mm F/2.8 [M.C] akaHanimex Automatic 28mm F/2.8	A	7 - 7	0.40m	⌀52	●
Chinon Auto 28mm F/2.8 Multi-Coated akaAgfa Color 28mm F/2.8 Multi-Coated	A	7 - 7	0.30m	⌀49	1979 ●
Cosina 24mm F/2.8 MC Macro akaCarl Zeiss Jena II 24mm F/2.8 MC Macro akaPhoenix 24mm F/2.8 Macro	A	7 - 7	0.19m	⌀52	●
Cosina 28mm F/2.8 MC Macro akaCarl Zeiss Jena II 28mm F/2.8 MC Macro akaPhoenix 28mm F/2.8 Macro akaVivitar Wide Angle 28mm F/2.8 MC	A	5 - 5	0.22m	⌀49	●
Cosina Cosinon-W 28mm F/2 MC akaPetri 28mm F/2 MC	A	8 - 7	0.30m	⌀49	1981 ●
Cosina Cosinon-W 24mm F/2.8 MC	A	7 - 7	0.25m	⌀49	1981 ●
Cosina Cosinon-W 28mm F/2.8 MC akaBauer Neovaron 28mm F/2.8 Multicoated akaCarl Zeiss Jena 28mm F/2.8 MC akaMiranda 28mm F/2.8 MC akaVivitar Auto 28mm F/2.8 VMC	A	6 - 6	0.30m	⌀49	1981 ●
Hanimex Automatic 28mm F/2.8 MC	A	8 - 7	0.30m	⌀55	●
Irix 30mm F/1.4 SLR	A	13 - 11	0.34m	⌀86	2021 ●
Kino Precision Kiron 24mm F/2 MC	A	8 - 8	0.30m	⌀55	1980 ●
Kino Precision Kiron 28mm F/2 MC	A	8 - 8	0.30m	⌀55	1980 ●
Kino Precision Kiron 28mm F/2.8 MC	A	? - ?	0.30m	⌀55	1980 ●
Panagor Auto Wide-Angle 28mm F/2.8 PMC	A	7 - 6	0.30m	⌀49	●
Panagor Auto Wide Angle 28mm F/2.5 [PMC] Type 2	A	8 - 7	0.30m	⌀67	●
Panagor Auto Wide-Angle 28mm F/2 PMC	A	8 - 8	0.30m	⌀55	●
Panagor Auto Wide-Angle 24mm F/2.5 PMC	A	? - ?	0.30m	⌀55	●
Quantaray 28mm F/2.8 MC	A	? - ?	0.30m	⌀49	●
Ricoh XR Rikenon 28mm F/3.5 Aspheric • Pancake lens	A	5 - 4	0.35m	⌀52	●
Ricoh XR Rikenon 28mm F/2.8	A	7 - 7	0.30m	⌀52	1980 ●
Ricoh XR Rikenon 24mm F/2.8	A	7 - 7	0.18m	⌀52	1982 ●
Ricoh XR Rikenon 28mm F/3.5	A	6 - 6	0.30m	⌀52	1977 ●
Ricoh Rikenon P 28mm F/2.8	A	7 - 7	0.30m	⌀52	1984 ●
Ricoh Rikenon P 28mm F/2.8 Macro	A	5 - 5	0.22m	⌀49	●
Sigma MF Super-Wide 24mm F/2.8 Multi-Coated II	A	8 - 7	0.18m	⌀52	1988 ●
Sigma MF High-Speed Wide 28mm F/1.8 Aspherical II ZEN	A	9 - 8	0.30m	⌀58	1994 ●
Sigma MF High-Speed Wide 28mm F/1.8 Aspherical Multi-Coated ZEN	A	9 - 8	0.30m	⌀58	1990 ●
Sigma MF Mini-Wide 28mm F/2.8 Multi-Coated II akaQuantaray 28mm F/2.8 Multi-Coated	A	6 - 6	0.22m	⌀52	1985 ●
Sigma MF H.L. Wide 28mm F/2.8 Multi-Coated	A	8 - 7	0.22m	⌀52	1984 ●
Sigma MF Super-Wide 24mm F/2.8 Multi-Coated	A	7 - 7	0.18m	⌀52	1981 ●
Sigma MF Mini-Wide 28mm F/2.8 Multi-Coated akaPentacon Prakticar PM 28mm F/2.8 MC	A	7 - 6	0.22m	⌀52	1978 ●
Sigma[-XQ] MF 28mm F/2.8 Filtermatic Multi-Coated	A	8 - 7	0.35m	⌀52	1978 ●
Sigma[-XQ] MF 24mm F/2.8 Filtermatic Multi-Coated	A	10 - 8	0.25m	⌀62	1978 ●
Sigma-Z MF 24mm F/2.8 [Multi-Coated]	A	10 - 8	0.25m	⌀62	1975 ●
Sigma-Z MF 28mm F/2.8 [Multi-Coated]	A	7 - 6	0.40m	⌀62	1975 ●
Soligor C/D 28mm F/2 P (s/n 1xxxxxxx)	A	8 - 7	0.23m	⌀58	1974 ●
Soligor G/S Wide-Auto 24mm F/2.5 MC (s/n 3xxxxxx)	A	9 - 7	0.30m	⌀55	●
Soligor G/S Wide-Auto 28mm F/2.5 MC (s/n 3xxxxxx)	A	8 - 8	0.30m	⌀52	●
Soligor C/D 28mm F/2.8 MC	A	7 - 6	0.40m	⌀58	●
Soligor C/D 28mm F/2.8 (s/n 1xxxxxxx)	A	7 - 7	0.30m	⌀52	●
Soligor Wide-Auto 28mm F/2.8 (s/n 1xxxxxxx)	A	7 - 6	0.30m	⌀58	●
Soligor C/D Dualfocal 28+35mm F/3.5+3.8 MC	A	9 - 9	0.40m	⌀52	1981 ●
Tokina SL 28mm F/2.8	A	5 - 5	0.30m	⌀49	●
Tokina SL 24mm F/2.8 [II]	A	7 - 7	0.19m	⌀52	●
Tokina 24mm F/2.8 RMC akaTokina SL 24mm F/2.8 [I]	A	8 - 8	0.27m	⌀52	●
Tokina 28mm F/2.8 RMC akaVoigtlander Color-Skoparet 28mm F/2.8 MC	A	5 - 5	0.30m	⌀52	●
Vivitar Series 1 Auto Wide Angle 28mm F/1.9 VMC (s/n 37xxxxxx)	A	9 - 8	0.30m	⌀58	1976 ●
Vivitar [Auto] Wide-Angle 24mm F/2 [MC] Compact (s/n 22xxxxxx)	A	8 - 8	0.30m	⌀55	1978 ●
Vivitar [Auto] Wide-Angle 28mm F/2 [MC] Compact (s/n 22xxxxxx)	A	8 - 8	0.30m	⌀55	1978 ●
Vivitar Auto Wide-Angle 28mm F/2.5 Type 2 (s/n 22xxxxxx)	A	8 - 7	0.30m	⌀67	●
Vivitar Auto Wide-Angle 28mm F/2.5 Type 1 (s/n 22xxxxxx)	A	8 - 7	0.30m	⌀62	1969 ●
Vivitar [Auto] Wide Angle 28mm F/2.8 [MC] Compact [I] (s/n 28xxxxxx)	A	7 - 7	0.30m	⌀49	●
Vivitar Wide Angle 28mm F/2.8 MC Compact [II] (s/n 42xxxxxx)	A	7 - 7	0.30m	⌀49	1983 ●
Vivitar Wide Angle 28mm F/2 MC Close Focus (s/n 28xxxxxx)	A	8 - 7	0.23m	⌀49	1983 ●
Vivitar Wide Angle 28mm F/2.8 MC Close Focus (s/n 28xxxxxx)	A	5 - 5	0.23m	⌀49	●
Vivitar Wide Angle 24mm F/2.8 MC (s/n 9xxxxxxx)	A	7 - 7	0.19m	⌀52	●
Vivitar Auto Wide-Angle 24mm F/2.8 (s/n 37xxxxxx)	A	8 - 7	0.25m	⌀58	1976 ●
Vivitar Wide Angle 24mm F/2 MC Compact (s/n 28xxxxxx)	A	8 - 8	0.30m	⌀52	●
Vivitar Wide Angle 28mm F/2.8 MC (s/n 9xxxxxxx)	A	5 - 5	0.23m	⌀49	●
Vivitar Wide Angle 28mm F/2.8 MC (s/n 61xxxxxx)	A	? - ?		⌀52	●
Carl Zeiss Classic Distagon T* 25mm F/2.8 ZF / ZF.2 / ZK / ZS	A	10 - 8	0.17m	E58	2006 ●

■Interchangeable mount (25)
Hanimex 28mm F/2.8 [T] akaHanimex 28mm F/3	P	7 - ?	0.45m	⌀58	●
Sankyo Kohki W-Komura 28mm F/3.5 [Unidapter]	P	6 - ?	0.40m	⌀55	●
Sankyo Kohki W-Komura 24mm F/3.5 [Unidapter Auto]	A	7 - ?	0.26m	⌀52	●
Sankyo Kohki W-Komura 28mm F/3.5 [Unidapter Auto]	A	8 - ?	0.30m	⌀52	●
Komuranon 24mm F/2.5 K·M·C	A	11 - 8	0.26m	⌀58	1974 ●
Komuranon 28mm F/2.5 K·M·C	A	9 - 7	0.30m	⌀58	1974 ●
Sigma[-XQ] MF [Wide] 24mm F/2.8 Filtermatic [Multi-Coated] [YS]	A	10 - 8	0.20m	⌀62	1972 ●
Sigma MF Widemax 28mm F/2.8 [Multi] [YS]	A	7 - 6	0.30m	⌀62	1970 ●
Soligor Wide-Auto 28mm F/2.8 (s/n 1xxxxxxx) [T-4]	A	7 - 6	0.30m	⌀58	●
Soligor Wide-Auto 24mm F/2.8 (s/n 1xxxxxxx) [T-4]	A	8 - 7	0.30m	⌀67	●
Soligor Wide Angle 28mm F/2.8 [T]	P	6 - 6	3.5 ft.	⌀58	●
Mir-10A 28mm F/3.5 [T] akaМИР-10А 28mm F/3.5	P	8 - 7	0.20m	⌀67	●
Tamron 24mm F/2.5 MC 01B [Adaptall-2]	A	10 - 9	0.25m	⌀55	1979 ●
Tamron 24mm F/2.5 01BB [Adaptall-2]	A	10 - 9	0.25m	⌀55	1987 ●
Tamron 28mm F/2.5 MC 02B [Adaptall-2]	A	7 - 7	0.25m	⌀49	1979 ●
Tamron 24mm F/2.5 CW-24 [Adaptall]	A	10 - 9	0.25m	⌀55	1976 ●
Tamron 28mm F/2.8 CW-28 [Adaptall]	A	7 - 7	0.25m	⌀52	1976 ●
Tamron Auto 24mm F/3.5 [Adapt-A-Matic]	A	8 - 6	0.25m	⌀72	1971 ●
Tamron Auto 28mm F/2.8 [Adapt-A-Matic]	A	7 - 7	0.22m	⌀62	1969 ●
Tamron Auto 28mm F/2.8 [Adapt-A-Matic]	A	7 - 7	0.22m	⌀58	1972 ●
Vivitar Wide Angle 28mm F/2.5 [T]	P	8 - 7	0.30m	⌀62	●
Vivitar Auto Wide-Angle 28mm F/2.8 (s/n 37xxxxxxx) [T-4]	A	7 - 6	0.30m	⌀58	1968 ●
Vivitar Auto Wide-Angle 24mm F/2.8 (s/n 37xxxxx) [T-4]	A	8 - 7	0.30m	⌀67	●
Vivitar Auto Wide-Angle 28mm F/2.5 (s/n 37xxxxxx) [TX]	A	7 - 7	0.24m	⌀52	1976 ●
Vivitar Auto Wide-Angle 24mm F/2.8 (s/n 37xxxxxx) [TX]	A	8 - 7	0.23m	⌀58	1976 ●

Almaz-103

Alpa

Asahi Pentax M42

Asahiflex M37

Bronica

Bronica ETR

Bronica GS-1

Bronica RF645

Bronica SQ

Canon EOS

Canon EOS APS-C

Canon EOS M

Canon EOS R

Canon EOS R APS-C

Canon FD

Canon FL

Canon R

Canon S (J)

Canon S (LSM)

Chinon K

Chinon M42

Contarex

Contax

Contax/Praktica

Contax/Yashica

Contax 645

Contax G

Contax N

Cosina K

Cosina M42

Exakta

Exakta 6x6 (horizontal)

Exakta 66

Exakta 66 (vertical)

Exakta Twin TL

Exakta real

FED

Fujica GS645 Professional

Fujica M42

Fujica X

Fujifilm G

Fujifilm GA645 Professional

Fujifilm X

Hasselblad 1600F/1000F

Hasselblad H

Hasselblad V

Hasselblad X

Hasselblad XPan

Icarex

Kiev-17/19/20

Kiev-II/III/4/5

Kiev 6S/60

Konica AR

Konica F

Kowa Six

Leica CL

Leica L

Leica L APS-C

Leica M

Leica R

Leica S

Leica SM

Leotax

Mamiya 6

Mamiya 7

Mamiya CP M42

Mamiya CS

Mamiya E

Mamiya ES

Mamiya M645

Mamiya RB67

Mamiya RZ67

Mamiya SX M42

Mamiya TL/DTL M42

Minolta-35

Minolta A

Minolta CLE

Minolta SR

Miranda

Nicca/Yashica