Mamiya/Sekor SX Auto 28mm F/2.8

Wide-angle prime lens • Film era • Discontinued

Announced:
· 1974
Production status:
● Discontinued
Country of design:
· Japan
Original name:
· AUTO mamiya/sekor SX 1:2.8 f=28mm
Class:
· Fast full-frame wide-angle prime lens
System:
· Mamiya SX M42 (1974)

Model history (4)

■Mamiya-Sekor 28mm F/2.8 for CP	P	7 - 5		⌀58	●
■Mamiya/Sekor Auto 28mm F/2.8 for TL	A	7 - 6	0.45m	⌀58	1966 ●
■Mamiya/Sekor Auto 28mm F/2.8 for DTL	A	7 - 6	0.30m	⌀58	●
■Mamiya/Sekor SX Auto 28mm F/2.8	A	7 - 7	0.30m	⌀58	1974 ●

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:	M42 [45.5mm] (modified)
Diagonal angle of view:	75.4° (35mm full frame)
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:	<No data>
Focusing modes:	Manual focus only
Manual focus control:	Focusing ring
Physical characteristics:
Weight:	205g
Maximum diameter x Length:	⌀?×52.4mm
Accessories:
Filters:	Screw-type 58mm
Lens hood:	Clamp-on round
Teleconverters:	Not available

Sources of data

Mamiya DSX 1000 & DSX 500 owners operating manual.
Mamiya MSX 1000 & MSX 500 owners operating manual.
mamiya/sekor DSX series owners operating manual.
mamiya/sekor MSX 500 owners operating manual.
Mamiya single-lens reflex cameras, interchangeable lenses and accessories booklet (1975).

Other wide-angle prime lenses in the Mamiya SX M42 system

■M42 mount (1)
Mamiya/Sekor SX Auto 35mm F/2.8		A	7 - 5	0.40m	⌀52	1974 ●

Lenses with similar focal length

■M42 mount (83)
Asahi Super-Takumar 24mm F/3.5 [43961]	A	9 - 8	0.25m	⌀58	1967 ●
Asahi Super-Takumar 28mm F/3.5 [43871]	A	7 - 7	0.40m	⌀49	1966 ●
Asahi Super-Takumar 28mm F/3.5 [348, 43480, 43481]	A	7 - 6	0.40m	⌀58	1962 ●
Asahi Super-Multi-Coated Takumar 24mm F/3.5 [43962]	A	9 - 8	0.25m	⌀58	1972 ●
Asahi Super-Multi-Coated Takumar 28mm F/3.5 [43872]	A	7 - 7	0.40m	⌀49	1971 ●
Chinar 28mm F/2.8 [M.C]	A	8 - 6	0.45m	⌀52	●
Chinon 24mm F/2.5 Multi Coated akaAuto-Alpa 24mm F/2.5 Multi-Coated	A	10 - 9	0.25m	⌀55	●
Chinon 28mm F/2.8 Multi Coated akaAuto-Alpa 28mm F/2.8 Multi-Coated	A	7 - 7	0.25m	⌀52	●
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 Auto 28mm F/2.8 [MC] akaPorst Super Weitwinkel autoN 28mm F/2.8 akaPorst Super-WW Auto 28mm F/2.8 MC G	A	8 - 6	0.40m	⌀58	1970 ●
Enna Munchen Ultra-Lithagon 28mm F/3.5 [C] Type 1	P	6 - 6	0.30m	⌀52	1955 ●
Enna Munchen Lithagon 24mm F/4	P	7 - 7	0.25m	⌀52	1960 ●
Enna Munchen Lithagon 28mm F/3.5 Type 2	P	6 - 6	0.30m	⌀52	●
Fuji Photo Film [EBC] Fujinon-SW 28mm F/3.5	A	7 - 7	0.40m	⌀49	1970 ●
Fuji Photo Film EBC Fujinon-SW 24mm F/2.8	A	9 - 8	0.30m	⌀49	●
Hanimex Wide-Auto 28mm F/2.8	A	7 - ?	0.45m	⌀58	●
Hanimex Automatic 28mm F/2.8 MC	A	8 - 7	0.30m	⌀55	●
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 ●
Mamiya/Sekor Auto 28mm F/2.8 for TL	A	7 - 6	0.45m	⌀58	1966 ●
Mamiya/Sekor Auto 28mm F/2.8 for DTL	A	7 - 6	0.30m	⌀58	●
Mamiya-Sekor 28mm F/2.8 for CP	P	7 - 5		⌀58	●
Meyer-Optik Gorlitz Orestegon 29mm F/2.8	A	7 - 7	0.25m	⌀55	1966 ●
Meyer-Optik Gorlitz Lydith 30mm F/3.5	P	5 - 5	0.33m	⌀49	1963 ●
Olympus G.Zuiko Auto-W 28mm F/3.5 for FTL	A	7 - 7	0.25m	⌀49	1970 ●
P. Angenieux Paris 28mm F/3.5 [Retrofocus] Type R11	M	6 - 6		S.IX	1953 ●
Panagor Auto Wide-Angle 28mm F/2.8 PMC	A	7 - 6	0.30m	⌀49	●
Panagor Auto Wide Angle 28mm F/2.5 Type 1	A	8 - 7	0.30m	⌀62	●
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	●
Pentacon 30mm F/3.5	P	5 - 5	0.33m	⌀49	1971 ●
Pentacon 29mm F/2.8 auto / electric Multi Coating	A	7 - 7	0.25m	⌀55	●
Pentacon 29mm F/2.8 auto / electric	A	7 - 7	0.25m	⌀55	1971 ●
Ricoh Rikenon 24mm F/2.8	A	10 - 8	0.20m	⌀62	●
Ricoh Rikenon Auto 28mm F/2.8	A	7 - 6	0.30m	⌀58	●
Ricoh Rikenon Auto 28mm F/2.8 EE	A	7 - 6	0.30m	⌀58	●
Ricoh Rikenon Auto 28mm F/2.8 P	A	? - ?	0.30m		●
Schneider-Kreuznach Curtagon 28mm F/4 Type 1	A	7 - 6	0.28m	S.VII	1958 ●
Schneider-Kreuznach Curtagon 28mm F/4 Type 2	A	7 - 6	0.25m	⌀49	1966 ●
Sears Auto 28mm F/2.8	A	7 - 6	0.30m	⌀58	●
Sigma MF Super-Wide 24mm F/2.8 Multi-Coated II	A	8 - 7	0.18m	⌀52	1988 ●
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 ●
Tamron-F [Auto] 28mm F/2.8	A	7 - 7	0.25m	⌀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 Auto Wide-Angle 24mm F/2.8 (s/n 37xxxxxx)	A	8 - 7	0.25m	⌀58	1976 ●
Vivitar Auto Wide Angle 28mm F/2.5 "Bright Band" (s/n 22xxxxxx)	A	8 - 7	0.30m	⌀62	1968 ●
Vivitar Auto 28mm F/2.8 "Chrome Nose"	A	8 - ?		⌀52	1966 ●
Yashica Yashinon-DS Auto 28mm F/2.8	A	8 - 7	0.30m	⌀52	●
Yashica Yashinon-DX Auto 28mm F/2.8	A	8 - 7			1967 ●
Yashica Yashinon DS-M Auto 24mm F/2.8	A	9 - 8	0.30m	⌀62	●
Yashica Yashinon DS-M Auto 28mm F/2.8	A	8 - 7	0.30m	⌀52	●
Yashica Yashikor Auto 28mm F/2.8	A	7 - 6	0.30m	⌀62	●
Carl Zeiss Classic Distagon T* 25mm F/2.8 ZF / ZF.2 / ZK / ZS	A	10 - 8	0.17m	E58	2006 ●
Carl Zeiss Distagon [HFT] 25mm F/2.8 akaOpton Oberkochen Di HFT 25mm F/2.8 akaRollei-HFT Distagon 25mm F/2.8 akaVoigtlander Color-Skoparex 25mm F/2.8	A	8 - 7	0.25m	E49	1970 ●
Carl Zeiss Distagon 25mm F/4	A	7 - ?	0.20m	B50	1972 ●
Carl Zeiss Jena DDR Flektogon 25mm F/4	A	7 - 6	0.20m	E77	1960 ●

■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 ●

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