Ricoh XR Rikenon 18mm F/2.8

Ultra-wide angle prime lens • Film era • Discontinued

  • Announced:
  • · 1982
  • Production status:
  • ● Discontinued
  • Country of design:
  • · Japan
  • Original name:
  • · RICOH XR RIKENON 1:2.8 18mm
  • Class:
  • · Fast full-frame ultra-wide angle prime lens
  • · Professional model
  • System:
  • · Ricoh K (1977)

Specification

Optical design:
35mm full frame
18mm
F/2.8
11 elements in 9 groups
Pentax K [45.5mm]
100.5° (35mm full frame)
On Pentax K APS-C [1.53x] cameras:
35mm equivalent focal length:
27.5mm (in terms of field of view)
35mm equivalent speed:
F/4.3 (in terms of depth of field)
Diagonal angle of view:
76.3°
Diaphragm mechanism:
Diaphragm type:
Automatic
Aperture control:
Aperture ring (Manual settings only)
<No data>
Focusing:
0.25m
<No data>
Focusing modes:
Manual focus only
Manual focus control:
Focusing ring
Physical characteristics:
348g
⌀76×71mm
Accessories:
Screw-type 67mm
Built-in petal-shaped
<No data>

Sources of data

  • Ricoh cameras booklet.
  • Ricoh SLR systems booklet.

Manufacturer description

This super wide-angle lens with its 100° angle of view opens up a world of creative possibilities in a super wide range of applications.

From the editor

Same lens as the Sigma 18/2.8.

Lenses with similar focal length

■Pentax K mount (32)
Chinon Auto 17mm F/3.5 MCA11 - 90.25m⌀67 1985 ●
Cosina Voigtlander Color-Skopar 20mm F/3.5 Aspherical SL IIA9 - 60.20m⌀52 2009 ●
Cosina Wide Angle 20mm F/3.8 MCA9 - 80.20m⌀62 ●
Irix 15mm F/2.4 SLRA15 - 110.25m⌀95 2016 ●
Irix 21mm F/1.4 SLRA15 - 110.30m-- 2022 ●
Venus Optics Laowa Wide 15mm F/4 Macro SLRM12 - 90.12m⌀77 2015 ●
Panagor Auto Wide Angle 21mm F/4A9 - 70.16m⌀82 ●
smc Pentax-A 15mm F/3.5A13 - 120.30m-- 1984 ●
smc Pentax-A 20mm F/2.8A10 - 90.25m⌀67 1985 ●
smc Pentax-M 20mm F/4A8 - 80.25m⌀49 1978 ●
smc Pentax 15mm F/3.5A13 - 120.30m-- 1975 ●
smc Pentax 18mm F/3.5A12 - 110.25m-- 1975 ●
smc Pentax 20mm F/4A12 - 100.25m⌀58 1975 ●
Sigma MF 18mm F/3.5 ZENA10 - 90.25m⌀72 1992 ●
Sigma MF Ultra-Wide 18mm F/2.8 Multi-Coated IIA10 - 90.25m⌀72 1984 ●
Sigma MF Ultra-Wide 18mm F/2.8 Multi-CoatedA11 - 90.25m⌀67 1980 ●
Sigma MF 18mm F/2.8 FiltermaticA12 - 90.23m⌀77 1978 ●
Soligor Wide-Auto 17mm F/3.5 [MC] (s/n 1xxxxxxx)A11 - 80.22m⌀72 ●
Soligor C/D Wide-Auto 20mm F/2.8 MCA9 - 70.20m⌀58 ●
Mir-47K 20mm F/2.5 MC
akaМИР-47К 20mm F/2.5 МС		A10 - 90.30m-- 1988 ●
Zenitar 20mm F/2.8 MC
akaЗЕНИТАР-К 20mm F/2.8 МС
akaЗЕНИТАР-М 20mm F/2.8 МС
akaЗЕНИТАР-Н 20mm F/2.8 МС
akaЗЕНИТАР-С 20mm F/2.8 МС		A10 - 90.25m⌀67 ●
Spiratone Ultra Wideangle 18mm F/3.5 Pluracoat [I]A11 - 80.22m⌀72 1979 ●
Spiratone Ultra Wideangle 18mm F/3.5 Pluracoat [II]A11 - 90.25m⌀67 ●
Spiratone 20mm F/2.8 Plura-CoatA9 - 70.20m⌀58 1983 ●
Tokina 17mm F/3.5 RMC Type 2
akaSpiratone Ultra Wideangle 17mm F/3.5 Pluracoat
akaTokina SL 17mm F/3.5		A11 - 90.25m⌀67 1980 ●
Tokina Wide-Auto 17mm F/3.5 RMC Type 1A11 - 80.22m⌀72 ●
Vivitar Auto Wide-Angle 20mm F/3.8 (s/n 22xxxxxx)A9 - 70.15m⌀82 1969 ●
Vivitar Auto Wide-Angle 17mm F/3.5 (s/n 37xxxxxx)A11 - 80.22m⌀72 1976 ●
Vivitar Wide-Angle 17mm F/3.5 MC (s/n 37xxxxxx)A11 - 90.25m⌀67 ●
Vivitar Wide Angle 19mm F/3.8 MC (s/n 9xxxxxxx)A9 - 80.20m⌀62 ●
Carl Zeiss Classic Distagon T* 18mm F/3.5 ZE / ZF / ZF.2 / ZKA13 - 110.30mE82 2008 ●
Carl Zeiss Classic Distagon T* 21mm F/2.8 ZE / ZF / ZF.2 / ZKA16 - 130.22mE82 2008 ●
■Interchangeable mount (6)
Sigma[-XQ] MF [Widerama] 18mm F/3.2 [Multi-Coated] [YS]
akaAccura/Sigma 18mm F/3.2
akaSpiratone 18mm F/3.2
akaSpiratone 18mm F/3.5		A12 - 100.17m⌀72 1972 ●
Soligor Wide-Auto 21mm F/3.8 (s/n 1xxxxxx) [T-4]A9 - 80.35m⌀72 1970 ●
Tamron SP 17mm F/3.5 51B [Adaptall-2]A12 - 100.25m-- 1979 ●
Tamron SP 17mm F/3.5 151B [Adaptall-2]A12 - 100.25m-- 1984 ●
Tamron Auto 21mm F/4.5 [Adapt-A-Matic]A8 - 60.25m⌀82 1970 ●
Vivitar Auto Wide-Angle 21mm F/3.8 (s/n 37xxxxxxx) [T-4]A9 - 80.35m⌀72 ●

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