Additional Information on Zuiko Lenses
MF Zuiko wide-tele-zoom 35-70mm lenses - Part 2

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S-Zuiko AUTO-Zoom 35-70mm f/4.0

In a rather strange move, Olympus actually has introduced two 35-70mm zoom lenses with seemingly overlapping lense-spec during the early '80. Based on what most OM users can tracked back to its origin, it was actually also being introduced at around the same period with another Zuiko equivalent, Zuiko AUTO zoom 35-70mm f/3.6 that carries with a slightly faster maximum lense speed.

" .... Olympus OM system Zuiko 35-70mm Auto-Zoom lens F/4 with original clamp-on rubber hood. This lens is in excellent mechanical condition: zoom, focus and aperture rings are clean and function smoothly. Aperture leaves are dry and operate accurately. Optically: objective and rear elements are crystal clear with only a trace of internal dust. The rubber shade gently clamps to the outer ring of this conveniently sized (dimensions and focal range) zoom by Zuiko! Includes lense, shade, original front & rear caps ...." -S.Mattson -

<<< -- Credit: Image courtesy of Mr Steven H. Mattson ® <>. Image Copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

But why would Olympus needs to provide two lenses with so much similarities ? This lense has a "S-Zuiko" designation in its lense data section helped in verification and differentiating it from the f/3.6 lense. I think it was a smart marketing move as during those days, high quality zoom lenses produced by camera manufacturers were usually expensive while on the other hand, third party lense manufacturers were beginning to explore such vacuum and slowly eroding market shares from major labels. By providing two options at a similar zoom range for this popular zoom range may be used as a positive way to offset such threats. Well, naturally, I wouldn't assume all sales assistants residing at those retail outlets were experienced enough to even outline the differences to their clients other than ensuring a sale can be concluded soonest possible and let the walk-in went home with a purchase.

Naturally a lense with original label should in any sense, more appealing than an equivalent third party offer. It was proven as this S-Zuiko has more bites than f/3.6 counterpart in term of sales even although many OM photographers have recognized the f/3.6 version is a better Zuiko zoom in an overall comparison. Offering a 3X zoom ratio, the S-Zuiko AUTO zoom 35-70 f/4.0 does possesses its very own strength to easily ranked it as a high quality zoom. Other than the lenses encompasses a popular zoom range singly covers the entire picture range of wide angle lenses from 35mm to a moderate telephoto range (picture angles from 63° (f=35mm) - 34°(f=70mm). This highly versatile lense is extremely compact and lightweight (71mm long, 385gm light), making it very convenient for everyday use. Optically, this highly portable Zuiko zoom provides surprisingly very high optical performance where its multicoated elements, and superior optical design enables minimal distortion, sharp resolution in superb color rendition while minimizing any possible flare and ghost images when shooting backlit pictures. It does not incorporates any close range optical correction system but the lense can close focus to an amazing distance down to about 29.6 inches (0.75m). Its focusing mechanism is very smooth and operating perfectly with its separate zoom control ring that has essential focal length setting printed in bright green colour as an easy zoom reference. One feature often Olympus likes to highlight in technical aspect is, the lense provides good zoom actions with no focus shift from wide-angle to telephoto position where correct focus is maintained throughout the zoom range.

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With the maximum aperture of f/4.0 - although considered as 'slow", but it still provides for fast, accurate focusing on the central microprism spot in the screen. Frankly, the large 97% view field design (0.92X at infinity with 50mm lense) in the viewfinder system in most OM cameras such as OM1(n) and OM2(n) and smart selection of focusing screen types (see below) can play a big role in ensuring ease of focusing with many of these Zuiko lenses that usually provide slightly slower maximum lense speed.

<< -- Credit: Image courtesy of Mr Steven H. Mattson ® <>. Image Copyright © 2003. All rights reserved.
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<< -- Credit: Images courtesy of Mr Jerry "cameras plus"® <> Image Copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

Well, although generally can still be considered as quite compact in this class, but strangely despite it has a slower maximum lense speed than many comparing optic, this high performance Zuiko zoom still needs to use a 55mm filter attachment size for lense accessories. Other than this, this versatile dual rings Zuiko zoom can be used for all kinds of general photography including family and scenic pictures, and is particularly useful for occasions such as weddings, etc., providing for free selection between close-ups of individuals, and group portraits in a restricted area. An excellent travel companion lens for groups, landscapes, city scenes, interiors, architectures, etc. The lense accepts a 55mm threaded filter. The rubber lens hood provided may be reversed for convenience in storing.

Technical Specification for S. Zuiko AUTO-Zoom 35-70mm f/4.0

Lense Type:
Two-touch wide-tele-zoom design
Focal length: 35-70mm
Maximum aperture: 1:4.0
Lens construction: 7 elements in 7 groups
Picture angle: 63° (f=35mm) - 34°(f=70mm)
Automatic, full aperture metering
Aperture scale: f/4.0~ f/22

Distance scale: Graduated in meters and feet from 0.75m (2.5 ft) to infinity (oo)
Focusing: Rotating helicoid focusing system, by turning the focusing ring
Zooming: via an independent zooming ring
Filter attachment size / Filter(s): 55mm, Screw-in type
Lense hood: Rubberized 57mm screw-in type (see a picture at the top of this page)

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Minimum photographic range:48cm x 72cm (18.9 of x 28.3") @35mm; 25cm x 37.5cm (9.8" x 14.8") @70mm
71mm (2.8") at 70mm setting
Maximum diameter: 68mm (2.7")
: 380g. (113.4 oz.)
Recommended Focusing Screens: 2-4**, 2-13**,1-1*, 1-2*, 1-3*, 1-4N*, 1-4N**, 1-5#, 1-6#, 1-10*, 1-13* and 1-14*. * Compatible. # 1-5# and 1-6# (microprism-clear field type) can be used. They will provide for accurate and easy focusing but meter built into the OM-1 and OM-2 (on MANUAL) will not indicate correct light readings. With the OM-2 on AUTO, correct exposures are made on the film, but the meter needle does not give correct light readings.** Compatible, only with applicable OM bodies introduced at later stage

| previous | NEXT | 2/3 A few economical alternatives at this zoom range

35-70mm f/3.6 | 35-70mm f/4.0 | 35-70mm f/3.5~f/4.5 | 35-70mm f/3.5~f/4.8 | AF 35-70mm f/4.0 |

<<< -- Credit: Image courtesy of Mr Steven H. Mattson ® <>. Image Copyright © 2003. All rights reserved.

Zuiko AUTO-Zoom Lenses - Main Index page

| S-Zuiko AUTO Zoom 28-48mm f/4.0 | Zuiko AUTO Zoom 35-70mm f/3.6 | S-Zuiko AUTO Zoom 35-70mm f/4.0 | Zuiko AF AUTO Zoom 35-70mm f/4.0 | S-Zuiko AUTO Zoom 35-70mm f/3.5 ~ f/4.5 | S-Zuiko AUTO Zoom 35-70mm f/3.5 ~ f/4.8 | Zuiko AUTO Zoom 35-80mm f/2.8 ED | Zuiko AUTO Zoom 35-105mm f/3.5 ~ f/4.5 | Zuiko AUTO zoom 50-250mm f/5.0 | Zuiko AUTO zoom 65-200mm f/4.0 | S-Zuiko AUTO zoom 70-210mm f/4.5 ~ f/5.6 | Zuiko AUTO Zoom 75-150mm f/4.0 | Zuiko AUTO Zoom 85-200mm f/4.0 | Zuiko AUTO Zoom 85-250mm f/5.0 | S-Zuiko AUTO Zoom 100-200mm f/5.0 |

A Brief overview on Zuiko Optics
Zuiko Fisheye Lenses
8mm f/2.8 Circular Fisheye | 16mm f/3.5 Full Frame Fisheye
Zuiko Ultra-Wideangle Lenses
18mm f/3.5 | 21mm f/2.0 | 21mm f/3.5 | 24mm f/2.0 | 24mm f/2.8
Zuiko Wideangle Lenses
28mm f/2.0 | 28mm f/2.8 | 28mm f/3.5 | 35mm f/2 | 35mm f/2.8 |
Zuiko Standard Lenses
40mm f/2.0 | 55mm f/1.2 | 50mm f/1.2 | 50mm f/1.4 | 50mm f/1.8 | Zuiko 50mm f/2.0 PF
Zuiko Medium-Telephoto Lenses
85mm f/2.0 | 100mm f/2.0 | 100mm f/2.8 | 135mm f/2.8 | 135mm f/3.5
Zuiko Telephoto Lenses
180mm f/2.0 EDIF | 180mm f/2.8 | 200mm f/4.0 | 200mm f/5.0 Auto-T (brief)
Zuiko Super-Telephoto Lenses
250mm f/2.0 EDIF | 300mm f/4.5 | 350mm f/2.8 EDIF | 400mm f/6.3 | 500mm | 600mm f/6.5 |1000mm f/11.0
Special application Zuiko optics:
24mm f/3.5 Shift | 35mm f/2.8 Shift | 500mm f/8 Reflex | AF Zoom 35-70mm f/4.0 | Zuiko 50mm f/2.0 PF

Tele-Converters: 1.4X-A / 2X-A

Zuiko Macro/Close focus lenses: Zuiko AUTO MACRO 20mm f/3.5 | Zuiko AUTO MACRO 20mm f/2.0 | Zuiko AUTO MACRO 38mm f/3.5 | Zuiko AUTO MACRO 38mm f/2.8 | Zuiko AUTO MACRO 50mm f/3.5 | Zuiko AUTO MACRO 50mm f/2.0 | Zuiko AUTO MACRO 1:1 80mm f/4.0 | Zuiko AUTO MACRO 90mm f/2.0 | Zuiko AUTO MACRO 135mm f/4.5

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Maintainers for OM Zuiko Site & Message Board: Rick Oleson (Email: Website:, Bruce Hamm (, John Orrell (, Simon Evans, (; Shaun (, Andy Radcliffe (

Special thanks to: Gregory P. Logiodice, Bob Gries, Erwin Voogt, Joel Wilcox, Rick Oleson, Simon Evan and many others for granting permissions to use their images of either lenses, cameras and own pictures appeared in this Zuiko website.

Credit: My old time buddy, Ahmad Ikram, Dr of Rubber Research Institute (RRI), Malaysia who shares the same passion with me and also lending his OM-1n, OM-4 and the Motor Drive 1 to me for preparing some images in this site; Mark Dapoz <>for reminding some broken links; Mr Poon of Foto Poon, Ipoh, Mr Richard, Ampang Park, Mr Lim and Miss Jenny of Foto Edar for their generosity for their OM1(n), OM2n camera and some Zuiko lenses. Mr Hans van Veluwen for mistakenly using some content earlier from his OM website; J Sorensen for providing some useful images to rectify some technical "flaws"; Mr Gen Holst for helping during the early stages of development of this OM site; Mr KKLow for some of his earlier images on the OM-1appeared in this website; Miss Wati and Mirza for helping me to convert this Operation Manual into a HTML format. Mr MCLau for rectifying some mistakes made on the earlier preview sites. A personal tribute to the creator of the OM system and also a site dedicated to all the fans of Olympuses and Zuiko Optics worldwide. Some of the content and images appeared in this site were scanned from OM official marketing leaflets, brochures and instruction manual(s) for educational purposes. Olympus is a registered trade name of Olympus Optical Inc., Japan. Site created 'unfortunately again with an IMac.