Olympus OM system close-up and macro equipment

Zuiko Auto-Macro Lens 50mm f/2

Introduction

The 50mm f/2 Macro Zuiko is a member of the second series of OM lenses, which were designed with an emphasis on large maximum aperture and high performance, without the concern for small size that characterised the first series, including the 50mm f/3.5 Macro Zuiko. The lens was designed for optimum performance at a magnification of ×0.1, and the floating elements minimise the aberrations that would normally be expected at higher and lower magnifications. Olympus promoted this as the fastest macro lens on the market, and its f/2 maximum aperture does help to keep the viewfinder bright even at full extension. However, there was a faster macro lens, the Kern-Macro-Switar 50mm f/1.9 for the Alpa system, which was still being made in small numbers in the 1980’s.

The lens can focus from infinity to ½ life size. With the addition of a 25 mm Auto Extension Tube, the focusing range can be altered to cover ½ life size to life size (1:1). The extended focusing range compared with a standard 50mm lens requires a longer focusing helicoid, and in order to accommodate this the front element is recessed, providing a built-in lens hood.

The non-macro Zuiko lenses have 2 focusing scales, one in feet with orange markings and the other in metres with white markings. The 50mm f/2 Macro Zuiko does not follow this pattern, and has a magnification scale with yellow markings plus one focusing scale in either feet (orange) or metres (white), and so there are separate versions with metric and Imperial focusing scales.

The large diameter of the lens prevents it from being used with some tripods and copy stands that have large attachment plates.

Versions

  1.  ZUIKO AUTO-MACRO 50mm 1:2  (101xxx, 102xxx, 103xxx, 105xxx, 106xxx, 107xxx, 113xxx)
    1. focusing scale in feet
    2. focusing scale in metres
  2.  ZUIKO AUTO-MACRO f=50mm 1:2  (112xxx, 113xxx)
    1. focusing scale in feet
    2. focusing scale in metres

Features

Optimum performance ×0.1
Optimum range 0 – ×0.5
Lens elements 9
Lens groups 7
Floating elements Yes
Lens coating Multicoated
Iris diaphragm Automatic
Iris blades 6
Maximum aperture f/2
Minimum aperture f/16
Focusing helicoid ? mm
Minimum length 55 mm, 2.2 in
Maximum diameter 69 mm, 2.7 in
Weight 320 g, 11.3 oz
Mount OM bayonet
Focusing screens 1-1, 1-2, 1-3, 1-4, 1-4N, 1-5, 1-10, 1-13, 1-14, 2-4, 2-13
Front cap Standard 55 mm
Rear cap Standard OM
Case Lens pouch 100
Hood None
(recessed front element)
Filter size 55 × 0.75 mm (screw-in)
US catalog no. 103-713
Introduced 1985
Discontinued 2002
Cross-section
Cross-section

Maximum magnification

Magnification ×0.5 Subject area 72×48 mm
2.8×1.9 in
Working distance ? mm

Maximum magnification (with 25 mm Extension Tube)

Magnification ×1 Subject area 36×24 mm Working distance ? mm

Accessories

The Macro Flash Shoe Ring screws into the 55 mm filter mount, and takes the heads of the T28 Macro Twin Flash 1 or the T28 Macro Single Flash 1.

See also:    Close-up and Macro Photography – Macro Lenses

Instruction leaflet

Reproduced with permission from the copyright owner, Olympus Optical Co., Ltd

ZUIKO AUTO-MACRO 50MM 1:2

This standard macro lens covers a wide focusing range from infinity down to ½× close-ups. With its large aperture ratio of F2, it expands your picture-taking scope and insures superb picture sharpness.

• Names of parts

  1. Focusing Ring
  2. Distance Scale
  3. Depth of Field Scale
  4. Aperture Ring
  5. Magnification Scale
  6. Infrared Index Mark

Specifications

* Combined with an auto extension tube or bellows, this lens permits magnifications higher than ½×. For best results, use special macro lenses suited for your desired magnification.

• Depth of Field Table (in metres)

F stop Distance scale   —   Camera-to-subject distance
*0.24 *0.25 *0.3 *0.4 *0.5 *0.7 *1 2 *3 *∞
2 0.24–0.24 0.25–0.25 0.30–0.30 0.40–0.40 0.50–0.50 0.69–0.71 0.98–1.02 1.91–2.10 2.80–3.23 40.0–∞
2.8 0.24–0.24 0.25–0.25 0.30–0.30 0.40–0.40 0.49–0.51 0.69–0.71 0.97–1.03 1.88–2.14 2.73–3.33 28.6–∞
4 0.24–0.24 0.25–0.25 0.30–0.30 0.40–0.40 0.49–0.51 0.68–0.72 0.96–1.04 1.83–2.20 2.63–3.50 20.0–∞
5.6 0.23–0.23 0.25–0.25 0.30–0.30 0.39–0.41 0.49–0.51 0.68–0.73 0.95–1.06 1.77–2.30 2.51–3.75 14.3–∞
8 0.24–0.24 0.25–0.25 0.30–0.30 0.39–0.41 0.48–0.52 0.67–0.74 0.92–1.09 1.69–2.45 2.34–4.20 10.1–∞
11 0.24–0.24 0.25–0.25 0.29–0.31 0.39–0.41 0.48–0.52 0.65–0.76 0.90–1.13 1.60–2.68 2.16–4.94 7.33–∞
16 0.24–0.24 0.25–0.25 0.29–0.31 0.38–0.42 0.47–0.54 0.63–0.79 0.86–1.20 1.47–3.18 1.92–7.02 5.06–∞

Circle of least confusion 1/30 mm.
Figures with * are engraved on the distance scale.

• Depth of Field Table (in feet)

F stop Distance scale   —   Camera–to–subject distance (feet)
*9.5″ *10″ *11″ *1 *1.25 *1.5 *2 *3 *4 *6 *∞
2 0.79–0.79 0.83–0.83 0.91–0.92 1.00–1.00 1.24–1.26 1.49–1.51 1.98–2.02 2.95–3.06 3.90–4.11 5.76–6.26 130–∞
2.8 0.79–0.79 0.83–0.84 0.91–0.92 1.00–1.00 1.24–1.26 1.48–1.52 1.97–2.03 2.92–3.08 3.86–4.15 5.67–6.37 93.2–∞
4 0.79–0.79 0.83–0.84 0.91–0.92 0.99–1.01 1.24–1.26 1.48–1.52 1.96–2.05 2.89–3.12 3.80–4.22 5.54–6.55 65.5–∞
5.6 0.79–0.80 0.83–0.84 0.91–0.92 0.99–1.01 1.23–1.27 1.47–1.53 1.94–2.07 2.85–3.17 3.73–4.32 5.38–6.80 46.9–∞
8 0.79–0.80 0.83–0.84 0.91–0.93 0.99–1.01 1.22–1.28 1.46–1.55 1.92–2.09 2.79–3.25 3.62–4.48 5.15–7.21 32.9–∞
11 0.78–0.80 0.82–0.84 0.90–0.93 0.98–1.02 1.21–1.29 1.44–1.56 1.89–2.13 2.72–3.35 3.50–4.69 4.89–7.80 24.0–∞
16 0.78–0.80 0.82–0.85 0.90–0.94 0.97–1.03 1.20–1.31 1.42–1.59 1.84–2.20 2.61–3.54 3.31–5.09 4.51–9.04 16.6–∞

Circle of least confusion 1/760 in.
Figures with * are engraved on the distance scale.

• Care and Storage

Care and storage of Olympus 50 mm f/2 Zuiko Auto-Macro lens

• Compatible focusing screens:

Screen 1-1
1-1
Screen 1-2
1-2
Screen 1-3
1-3
Screen 1-4n
1-4N
Screen 1-5
1-5
Screen 1-6
1-6
Screen 1-10
1-10
Screen 1-13
1-13
Screen 1-14
1-14
Manual exposure
Automatic exposure
Finder exposure indication (OM2N
OM1N)
(OM2N
OM1N)

OLYMPUS
OLYMPUS OPTICAL CO., LTD.
San-Ei Building, 22-2, Nishi Shinjuku 1-chome, Shinjuku-ku, Tokyo, Japan

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Created 18th May 2001   —   Updated 6th January 2010
Copyright © 2001–2010 Alan Wood

Olympus OM system close-up and macro equipment