Olympus OM system close-up and macro equipment

Zuiko Auto-Macro Lens 90mm f/2

Introduction

The 90mm 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. This was the first macro lens in the 90–105 mm range from any manufacturer to feature an f/2 maximum aperture, a feature that helps to keep the viewfinder bright even at full extension. 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.

The lens can focus from infinity to ½ life size. With the addition of a full set (7 + 14 + 25 mm) of Auto Extension Tubes, the focusing range can be altered to cover ½ life size to life size (1:1). Unlike the 50mm macro lenses, the front element is not recessed, and so a separate rubber lens hood was available.

The non-macro Zuiko lenses have 2 focusing scales, one in feet with orange markings and the other in metres with white markings. The 90mm 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.

Versions

  1.  ZUIKO AUTO-MACRO 90mm 1:2  (101xxx, 102xxx, 103xxx, 104xxx, 105xxx, 108xxx, 109xxx, 111xxx, 113xxx)
    1. focusing scale in feet
    2. focusing scale in metres
  2.  ZUIKO AUTO-MACRO f=90mm 1:2.0  (110xxx)
    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 9
Floating elements Yes
Lens coating Multicoated
Iris diaphragm Automatic
Iris blades 9
Maximum aperture f/2
Minimum aperture f/22
Focusing helicoid ? mm
Minimum length 71 mm, 2.8 in
Maximum diameter 72 mm, 2.8 in
Weight 550 g, 19.4 oz
Mount OM bayonet
Focusing screens 1-1, 1-2, 1-3, 1-4, 1-4N, 1-5, 1-6, 1-10, 1-13, 1-14, 2-4, 2-13
Front cap Standard 55 mm
Rear cap Standard OM
Case Soft lens pouch
Hood Rubber 57 mm clamp-on (same as 135 mm f/4.5 macro)
Filter size 55 × 0.75 mm (screw-in)
US catalog no. 103-732
Introduced 1986
Discontinued 2003
Cross-section
Cross-section


Lens hood
Clamp-on lens hood

Maximum magnification

Magnification ×0.5 Subject area 72×48 mm 2.8×1.9 in Working distance 240 mm

Maximum magnification (with 46 mm Extension Tubes)

Magnification ×1.00 Subject area 36×24 mm Working distance 14.0 mm

Accessories

A clamp-on rubber lens hood was available.

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.

The T10 Ring Flash 1 and T8 Ring Flash 2 screw into the 55 mm filter mount.

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 90MM 1:2

Olympus 90 mm f/2 Zuiko Auto-Macro lens and cross-section     Thank you for your purchase of the ZUIKO AUTO-MACRO 90mm. This medium-range telephoto macro lens covers a wide focusing range from ½× close-ups to infinity. With its large aperture ratio of F2, it provides excellent image definition in macro photography and promises good performance at infinity for extended picture-taking possibilities.

Specifications

• Focal length: 90mm • Max. aperture ratio: 1:2 • Angle of view: 27° • Optical construction: 9 elements in 9 groups (multicoated) • Diaphragm operation: Automatic • F stop range: 2–22 • Minimum focus: 0.4m (15.7″) • Minimum field: 48 × 72mm (1.9″ × 2.8″) • Focusing: Straight helicoid (providing for aberration correction at close range) • Weight: 550g (19.4oz.) • Length: 71mm (2.8″) • Max. diameter: 72mm (2.8″) • Lens hood: 57mm slip-on (optional; same as for 135mm F4.5 macro lens) • Filter: 55mm screw-in.

*Combined with an Auto Extension Tube or Auto Bellows, this lens permits magnifications higher than ½×. For best results, however, it is recommended to use other macro lenses designed for specific magnifications.

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)		 ○ ○ ○

Depth of Field Table (in metres)

F stop Distance scale   —   Camera-to-subject distance
*0.4 *0.5 *0.7 *1 *1.5 *2 *3 *5 *10 *∞
2 0.40 0.50 0.70 0.99–1.01 1.48–1.52 1.97–2.03 2.93–3.07 4.81–5.21 9.24–10.89 118.01–∞
2.8 0.40 0.50 0.70 0.99–1.01 1.48–1.52 1.96–2.04 2.91–3.10 4.74–5.29 9.00–11.25 86.95–∞
4 0.40 0.50 0.69–0.71 0.99–1.01 1.47–1.53 1.94–2.06 2.87–3.14 4.64–5.42 8.63–11.90 61.04–∞
5.6 0.40 0.50 0.69–0.71 0.98–1.02 1.46–1.54 1.92–2.08 2.82–3.20 4.51–5.61 8.18–12.87 43.70–∞
8 0.40 0.50 0.69–0.71 0.98–1.03 1.44–1.56 1.89–2.12 2.75–3.30 4.33–5.92 7.59–14.69 30.65–∞
11 0.40 0.50–0.51 0.69–0.71 0.97–1.04 1.42–1.59 1.85–2.17 2.67–3.43 4.12–6.36 6.96–17.83 22.23–∞
16 0.40 0.49–0.51 0.68–0.72 0.95–1.05 1.39–1.63 1.79–2.26 2.54–3.66 3.82–7.27 6.12–27.75 15.39–∞
22 0.40 0.49–0.51 0.67–0.73 0.94–1.07 1.35–1.69 1.73–2.38 2.41–4.00 3.51–8.77 5.35–84.10 11.21–∞

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

Depth of Field Table (in feet)

F stop Distance scale   —   Camera–to–subject distance (feet)
*1.3 *1.5 *2 *3 *4 *6 *8 *12 *20 *∞
2 1.30 1.50 1.99–2.01 2.98–3.02 3.97–4.03 5.92–6.08 7.86–8.15 11.67–12.35 19.06–21.03 377.07–∞
2.8 1.30 1.50 1.99–2.01 2.98–3.02 3.96–4.05 5.89–6.11 7.80–8.21 11.55–12.49 18.75–21.43 279.74–∞
4 1.30 1.50 1.99–2.01 2.97–3.03 3.94–4.06 5.85–6.16 7.72–8.30 11.37–12.71 18.26–22.11 197.54–∞
5.6 1.30 1.49–1.51 1.98–2.02 2.95–3.05 3.91–4.09 5.79–6.23 7.62–8.42 11.13–13.02 17.64–23.09 141.97–∞
8 1.29–1.31 1.49–1.51 1.98–2.02 2.94–3.07 3.88–4.13 5.70–6.33 7.47–8.62 10.80–13.51 16.80–24.74 99.87–∞
11 1.29–1.31 1.49–1.51 1.97–2.03 2.91–3.09 3.83–4.18 5.60–6.46 7.28–8.88 10.41–14.18 15.85–27.16 72.90–∞
16 1.29–1.31 1.48–1.52 1.95–2.05 2.87–3.14 3.76–4.27 5.44–6.70 7.00–9.35 9.82–15.46 14.49–32.46 50.31–∞
22 1.29–1.31 1.48–1.53 1.94–2.07 2.83–3.19 3.68–4.39 5.26–7.00 6.69–9.98 9.20–17.36 13.14–42.44 36.70–∞

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

Care and Storage

Care and storage of Olympus 90 mm f/2 Zuiko Auto-Macro lens

Lens application range

Lens position Subject area covered (mm) Magnification Distance from lens to subject (cm)
Lens alone Normal 0 ∞
Extended 72×48 0.5× 23.5
With 7mm Auto Extension Tube Normal 450×300 0.08× 113.4
Extended 62.1×41.4 0.58× 20.9
With 14mm Auto Extension Tube Normal 225×150 0.16× 61.1
Extended 55.4×36.9 0.65× 19.1
With 7mm+14mm Auto Extension Tubes Normal 150×100 0.24× 41.7
Extended 49.3×32.9 0.73× 17.5
With 25mm Auto Extension Tube Normal 128.6×85.7 0.28× 36.6
Extended 46.8×31.2 0.77× 16.9
With 25mm+7mm Auto Extension Tubes Normal 100×66.7 0.36× 29.3
Extended 42.9×28.6 0.84× 15.7
With 25mm+14mm Auto Extension Tubes Normal 81.8×54.5 0.44× 25.0
Extended 39.1×26.1 0.92× 14.8
With 25mm+14mm+7mm Auto Extension Tubes Normal 69.2×46.2 0.52× 21.8
Extended 36×24 1.00× 14
With 65-116mm Auto Extension Tube at 65mm Normal 50×33.3 0.72× 17.1
With 65-116mm Auto Extension Tube at 116mm Normal 27.9×18.6 1.29× 11.6
Extended 20.9×14.0 1.72× 10.0
With Auto Bellows at 68mm Normal 92.3×61.5 0.39× 27.5
With Auto Bellows at 122.5mm Normal 36×24 1.0× 13.6
With Auto Bellows at 173.5mm Reversed 36×24 1.0× 12.5
With Auto Bellows at 231mm Reversed 22.0×14.6 1.64× 13.6

      Optimum lens application range
      Possible

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

Exploded parts diagram

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Created 18th May 2001   —   Updated 28th February 2021
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Olympus OM system close-up and macro equipment