smc Pentax-A 24mm F/2.8

Wide-angle prime lens • Film era • Discontinued

Announced:
· March 1983
Production status:
● Discontinued
Country of design:
· Japan
Original name:
· SMC PENTAX-A 1:2.8 24mm
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.
A	A manual focus lens with automatic maximum aperture indexing and automatic aperture control. Learn more

Model history (2)

■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 ●

Specification

Optical design:
Maximum format:	35mm full frame
Focal length:	24mm
Speed:	F/2.8
Lens construction:	9 elements in 8 groups
Mount and Flange focal distance:	Pentax K [45.5mm]
Diagonal angle of view:	84° (35mm full frame)
On Pentax K APS-C [1.53x] cameras:
35mm equivalent focal length:	36.7mm (in terms of field of view)
35mm equivalent speed:	F/4.3 (in terms of depth of field)
Diagonal angle of view:	61°
Diaphragm mechanism:
Diaphragm type:	Automatic
Aperture control:	Aperture ring (Manual settings + Auto Exposure setting)
Number of blades:	5 (five)
Focusing:
Closest focusing distance:	0.25m
Magnification ratio:	1:6.67
Focusing modes:	Manual focus only
Manual focus control:	Focusing ring
Physical characteristics:
Weight:	205g
Maximum diameter x Length:	⌀63×41.5mm
Accessories:
Filters:	Screw-type 52mm
Lens hood:	PH-S52 - Clamp-on rectangular
Teleconverters:	Pentax Rear Converter-A 1.4X-S → 33.6mm F/3.9
Teleconverters:	Pentax Rear Converter-A 2X-S → 48mm F/5.6

Sources of data

Manufacturer's technical data.
smc Pentax-A lenses operating manual.
Pentax 35mm SLR lenses (September 1989).
Pentax lenses & accessories booklet (December 1986).
Pentax 35mm SLR lenses.
Pentax super A booklet (PUB. 06101) (May 1983).
Pentax A3 booklet (PUB. 08061) (January 1985).
Pentax SLR cameras booklet (PUB. 050101) (September 1988).
Pentax Super Program booklet (PUB. 06191).
Pentax New "A" Series Lenses booklet (PUB. 06701) (April 1984).
Pentax lenses & accessories - A Comprehensive and Versatile Photographic System booklet.

Manufacturer description

smc Pentax-A 24mm f/2.8, smc Pentax 24mm f/2.8:

Available with or without automatic aperture control, this lens is favored for scenic and architectural photography. It features a viewing angle of 84°, a fast maximum aperture, and shallow depth of field for easy focusing.

Pentax-A series

The third generation of lenses designed for Pentax 35mm SLR cameras with bayonet mount. Introduced with the Pentax super A in 1983.

Robust, all-metal design with recessed focusing distance scale;
Fully automatic diaphragm;
Support for TTL open-aperture metering;
Electronic contacts for transmission of aperture information;
"A" setting on the aperture ring for automatic aperture control in the Programmed AE and Shutter-priority AE modes;
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 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 [I]	A	7 - 7	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 (20)
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 Cosinon-W 24mm F/2.8 MC	A	7 - 7	0.25m	⌀49	1981 ●
Irix 21mm F/1.4 SLR	A	15 - 11	0.30m	--	2022 ●
Kino Precision Kiron 24mm F/2 MC	A	8 - 8	0.30m	⌀55	1980 ●
Panagor Auto Wide Angle 21mm F/4	A	9 - 7	0.16m	⌀82	●
Panagor Auto Wide-Angle 24mm F/2.5 PMC	A	? - ?	0.30m	⌀55	●
Ricoh XR Rikenon 24mm F/2.8	A	7 - 7	0.18m	⌀52	1982 ●
Sigma MF Super-Wide 24mm F/2.8 Multi-Coated II	A	8 - 7	0.18m	⌀52	1988 ●
Sigma MF Super-Wide 24mm F/2.8 Multi-Coated	A	7 - 7	0.18m	⌀52	1981 ●
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 ●
Soligor G/S Wide-Auto 24mm F/2.5 MC (s/n 3xxxxxx)	A	9 - 7	0.30m	⌀55	●
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	●
Vivitar [Auto] Wide-Angle 24mm F/2 [MC] Compact (s/n 22xxxxxx)	A	8 - 8	0.30m	⌀55	1978 ●
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	●
Carl Zeiss Classic Distagon T* 21mm F/2.8 ZE / ZF / ZF.2 / ZK	A	16 - 13	0.22m	E82	2008 ●
Carl Zeiss Classic Distagon T* 25mm F/2.8 ZF / ZF.2 / ZK / ZS	A	10 - 8	0.17m	E58	2006 ●

■Interchangeable mount (13)
Sankyo Kohki W-Komura 24mm F/3.5 [Unidapter Auto]	A	7 - ?	0.26m	⌀52	●
Komuranon 24mm F/2.5 K·M·C	A	11 - 8	0.26m	⌀58	1974 ●
Sigma[-XQ] MF [Wide] 24mm F/2.8 Filtermatic [Multi-Coated] [YS]	A	10 - 8	0.20m	⌀62	1972 ●
Soligor Wide-Auto 21mm F/3.8 (s/n 1xxxxxx) [T-4]	A	9 - 8	0.35m	⌀72	1970 ●
Soligor Wide-Auto 24mm F/2.8 (s/n 1xxxxxxx) [T-4]	A	8 - 7	0.30m	⌀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 24mm F/2.5 CW-24 [Adaptall]	A	10 - 9	0.25m	⌀55	1976 ●
Tamron Auto 21mm F/4.5 [Adapt-A-Matic]	A	8 - 6	0.25m	⌀82	1970 ●
Tamron Auto 24mm F/3.5 [Adapt-A-Matic]	A	8 - 6	0.25m	⌀72	1971 ●
Vivitar Auto Wide-Angle 21mm F/3.8 (s/n 37xxxxxxx) [T-4]	A	9 - 8	0.35m	⌀72	●
Vivitar Auto Wide-Angle 24mm F/2.8 (s/n 37xxxxx) [T-4]	A	8 - 7	0.30m	⌀67	●
Vivitar Auto Wide-Angle 24mm F/2.8 (s/n 37xxxxxx) [TX]	A	8 - 7	0.23m	⌀58	1976 ●

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