smc Pentax-A 100mm F/2.8

Short telephoto prime lens • Film era • Discontinued

  • Announced:
  • · April 1984
  • Production status:
  • ● Discontinued
  • Country of design:
  • · Japan
  • Original name:
  • · SMC PENTAX-A 1:2.8 100mm
  • Class:
  • · Fast full-frame short telephoto 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-M 100mm F/2.8A5 - 51.00m⌀49 1977 ●
■smc Pentax-A 100mm F/2.8A5 - 51.00m⌀49 1984 ●

Specification

Optical design:
35mm full frame
100mm
F/2.8
5 elements in 5 groups
Pentax K [45.5mm]
24.4° (35mm full frame)
On Pentax K APS-C [1.53x] cameras:
35mm equivalent focal length:
153mm (in terms of field of view)
35mm equivalent speed:
F/4.3 (in terms of depth of field)
Diagonal angle of view:
16.1°
Diaphragm mechanism:
Diaphragm type:
Automatic
Aperture control:
Aperture ring (Manual settings + Auto Exposure setting)
6 (six)
Focusing:
1m
<No data>
Focusing modes:
Manual focus only
Manual focus control:
Focusing ring
Physical characteristics:
260g
⌀63×56mm
Accessories:
Screw-type 49mm
Built-in telescopic round
Pentax Rear Converter-A 1.4X-S → 140mm F/3.9
Pentax Rear Converter-A 2X-S → 200mm F/5.6

Sources of data

  • Manufacturer's technical data.
  • Pentax lenses & accessories booklet (December 1986).
  • Pentax 35mm SLR lenses.
  • Pentax A3 booklet (PUB. 08061) (January 1985).
  • Pentax cameras booklet (PUB. 06091, 40 pages) (March 1987).
  • Pentax SLR cameras booklet (PUB. 050101) (September 1988).
  • Pentax New "A" Series Lenses booklet (PUB. 06701) (April 1984).

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 short telephoto prime lenses in the Pentax K system

■Pentax K mount (8)
smc Pentax 85mm F/2.2 SoftM2 - 10.57m⌀49 1985 ●
smc Pentax-M 85mm F/2A5 - 40.85m⌀49 1977 ●
smc Pentax 85mm F/1.8A6 - 60.85m⌀52 1975 ●
smc Pentax-A* 85mm F/1.4A7 - 60.85m⌀67 1984 ●
smc Pentax-M 100mm F/2.8A5 - 51.00m⌀49 1977 ●
smc Pentax 105mm F/2.8A5 - 41.20m⌀52 1975 ●
smc Pentax 120mm F/2.8A5 - 41.20m⌀52 1975 ●
smc Pentax-M 120mm F/2.8A5 - 51.20m⌀49 1978 ●

Lenses with similar focal length

■Pentax K mount (2)
Venus Optics Laowa 105mm F/2 [T3.2] Smooth Trans Focus SLRM11 - 80.90m⌀67 2016 ●
Soligor Auto 100mm F/2 MC (s/n 2xxxxxx)
akaSpiratone Minitel 100mm F/2 Pluracoat		A6 - 41.50m⌀58 ●
■Interchangeable mount (11)
Sankyo Kohki Komura 105mm F/2 [Unidapter]P5 - 41.50m⌀58 1965 ●
Sankyo Kohki Komura 100mm F/1.8 [Unidapter]P5 - 41.40m⌀62 ●
Sankyo Kohki Komura 105mm F/2.5 [Unidapter]P5 - ?1.00m⌀48 ●
Sankyo Kohki Super-Komura 100mm F/2.5 [Unidapter Auto]A5 - ?0.90m⌀55 ●
Komuranon 100mm F/2.5 K·M·CA5 - 40.90m⌀58 1974 ●
Soligor Tele-Auto 105mm F/2.8 (s/n 1xxxxxxx) [T-4]A4 - 41.50m⌀49 ●
Soligor Telephoto 105mm F/2.8 [T]P4 - 44 ft.⌀46 ●
Vega-13A 100mm F/2.8 [T]
akaВЕГА-13А 100mm F/2.8		P5 - 50.80m⌀58 ●
Tamron 105mm F/2.5 CT-105 [Adaptall]A4 - 41.30m⌀52 1976 ●
Tamron Auto 105mm F/2.5 [Adapt-A-Matic]A4 - 41.00m⌀52 1972 ●
Vivitar Auto 105mm F/2.8 (s/n 37xxxxxxx) [T-4]A4 - 41.50m⌀49 ●

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