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. This was the first 50mm macro lens 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 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
- ZUIKO AUTO-MACRO 50mm 1:2 (101xxx, 102xxx, 105xxx, 106xxx, 107xxx, 113xxx)
- focusing scale in feet
- focusing scale in metres
- ZUIKO AUTO-MACRO f=50mm 1:2 (112xxx, 113xxx)
- focusing scale in feet
- 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 |
|
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
- Focusing Ring
- Distance Scale
- Depth of Field Scale
- Aperture Ring
- Magnification Scale
- Infrared Index Mark
Specifications
- Focal length: 50 mm
- Angle of view: 47°
- Optical construction: 9 elements in 7 groups, multi-coated
- Diaphragm operation: Automatic
- Minimum aperture: F16
- Minimum focus: 0.24 m (0.8′)
- Min. field size: 48 × 72 mm (1.9″ × 2.8″)
- Focusing: Straight helicoid
- Weight: 320 g (11.3 oz.
- Length: 55 mm (2.2″)
- Maximum diam.: 69 mm (2.7″)
- Filter size: 55 mm screw in
* 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–∞ |
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) |
| *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–∞ |
Figures with * are engraved on the distance scale.
Circle of least confusion 1/760 in.
OLYMPUS
OLYMPUS OPTICAL CO., LTD.
San-Ei Building, 22-2, Nishi Shinjuku 1-chome, Shinjuku-ku, Tokyo, Japan
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