Additional Information on Zuiko Lenses
Zuiko wide-tele-zoom AF 35-70mm f/4.0

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

<<< --- Credit: This image was specially taken by Mr. Jone Quinn <> for this OM project. Jone Quinn runs a popular Ebay Store and he specializes in selling OM photo gears. Image copyright © 2003 All rights reserved.
It was widely accepted that the Pentax ME-F introduced by Asahi Pentax Optical Ltd. in 1981 which based largely on a hugely popular Pentax ME-super, was the world first SLR that offers an autofocus capability. The autofocus feature will only work when used along with a dedicated K-mount Pentax AF 35-70 f/2.8 auto-Zoom that has a focusing motor built-in (it takes 4 x AA batteries). One interesting feature of the Pentax AF zoom is, the zoom will work on most prevailing Pentax SLRs at the time of its introduction (but will not work on the later SF, Z or PZ series). The design enables Pentax F/FA series lenses be used with ME-F on manual focus ONLY but the camera does provide an in-focus indication in the viewfinder.

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Well, is this relative to the Olympus ? Why not ? Basically, the Zuiko AF 35-70mm f/4.0 almost carries the same working principle as the Pentax. In fact, if I can recall correctly, Canon also has an equivalent FDn 35-70mm f/4.0 AF lense which even resembles the Zuiko lense more - both in form and size. Anyway, I am not sure when the Canon AF lense was introduced, probably around the same time as the Olympus's effort between 1983/1984 - but definitely before their first AF SLR body in the Canon T-80 of 1985. Anyway, as all these early attempts (including Nikon which used their flagship Nikon F3 as the basis for the Nikon F3 AF) were essentially prototypes to test the market reactions and they cannot be concluded as real serious effort and not to mention all Japanese companies have a culture of collaboration among them in this respect.

<<< --- Credit: Image courtesy of Canon Marketing (a little off topic - MIR is also the developer for Canon's corporate website here). Surviving...

Basically, the Zuiko lense here can also be regarded as a standalone AF Zoom as with the Pentax and Canon. Similarly, it has its own companion SLR body in the OM-30 (also called OM-F in many countries). With the OM-30 and/or with an OM Motor Drive and/or Power Winder unit, the camera can integrate with the lense for full AF functions (there is a difference here in terms of marketing approach, Canon's AF-FDn has remained as standalone AF optic throughout). Naturally, the lense is also equipped with a manual focus ring should you require to turn off the AF function on the lense. The Zuiko lense has 4 modes that set in a dial, battery check, Single AF, Sequence AF and a Power Focus setting via the two buttons locate at the side of the lense.

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<<< --- Credit: Specially thanks to Jone Quinn as these images were specially taken for the construction of this OM Zuiko website, Mr. Jone Quinn<> runs a popular Ebay Store and he specializes in selling OM photo gears and fortunately he has one of this in his stock. All Images copyright © 2003 All rights reserved. Please respect the visual property of the contributing photographers.

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First of all, the conventional way of photography which relying on the human eye and a split image microprism in the viewfinder, sometimes has its limitations in focusing precision e.g. personal eyesight, skill, shooting situation etc. and most of all when a fast pace action is involved The first generation AF lenses appearing during the early '80 may exhibit some weaknesses in dealing with such demanding requirement. But an AF zoom such as the Zuiko here does has its advantage in electronically performs precision focusing, minimizing human focusing errors via autofocusing device such as the use of CCD (charge-coupled device) image sensors to cover a focal length ranges in the region of 35 to 70 mm are easily frequently used for snapshots. To some, the convenience may not just for the ease in focusing but also opens potentially new photographic possibilities. The design of the lense is quite bulky (measuring a larger 92mm in its diameter and has a length of only 70mm) and weighing considerably at 550g (without batteries) as it needs to house its own power supply (3 x AAA cells) and hosting the microprocessor and electronic circuits.

<<< --- Credit: Image courtesy of Mr. Jone Quinn<> Image copyright © 2003 All rights reserved.

The main advantage of this AF Zuiko is in its operational ease. To effectively use the Zuiko 35-70 mm f/4 AF lense with a Olympus SLR other than the OM30, you should familiarize yourself with its characteristics. There are some situations where the AF system cannot properly measure distances. For example, subjects with great differences in depth, fast moving subjects and low-contrast subjects with great depth. With fast moving subjects, pre-focusing at a predetermined point and shooting as the subject reaches that point solves the problem. When photographing low-contrast subjects, focus on a substitute object at the same distance as the subject. Your focusing ingenuity in response to varied picture-taking situations will expand the horizons for AF shooting. This zoom lense also permits manual focusing. Using the AF as well as the manual focusing modes to suit your subject and motif needs is the key to success. However, Olympus warns if contrast and if light level is too low for AF detection, change to manual focus operation. Anyway, since this is an early AF version and it does has some handicap in this area (for an instance, the early design does not provide any depth of field indications), it is excusable and neither this lense was designed to perform multi AF tasks such as one of those modern AF camera available today., so, always ensure the camera/lense combination meets the criteria and limitations it has set. Similarly, I have my handicap too because I do NOT have a copy of the instruction manual for reference and it can be quite bad to mislead others. Do send me one scanned copy if you have and see if I can improve this section further with the content.

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Is/Was the standalone AF lense for MF SLRs market lucrative ? I don't know and I am not sure, but it does/did attracted many third party lense makers to join into the "brawl".. here is an image of the two Vivitar Series 1® wide-tele and tele-AF zoom lenses.

<<< -- Credit: Image courtesy of Mr Rick Oleson® <> who also co-maintains the popular OM Message Board in PIM site. Image Copyright © 2003. All rights reserved.

Specification for AF Zuiko AUTO-Zoom 35-70mm f/4.0

Lense Type:
Two-touch wide-tele-zoom design Autofocus type with applicable OM SLR bodies
Focal length: 35-70mm
Maximum aperture: 1:3.6
Lens construction: 9 elements in 8 groups, Multicoated
Picture angle: 63° (f=35mm) - 34°(f=70mm)
Automatic, full aperture metering
Aperture scale: f/4.0~ f/22

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Distance scale: Graduated in meters and feet from 0.75m (2.5 ft) to infinity (oo)
Focusing: Rotating helicoid system, by turning the focusing ring via Power Focus buttons and/or shutter release button on OM-30 or Motor Drive/Winder
Zooming: Rotating control via separate zooming ring
Filter attachment size / Filter(s): 55mm, Screw-in type

Lense hood: Rubberized 55mm slide-on type
Minimum photographic range: 48cm x 72cm (18.9 of x 28.3") @35mm; 25cm x 37.5cm (9.8" x 14.8") @70mm
Maximum diameter: 92mm
550g lense only without batteries
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

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 |

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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 |

<<<--- Another Image courtesy of Mr. Jone Quinn<> Image copyright © 2003 All rights reserved.

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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About this photographic site.

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Home - Photography in Malaysia

Copyright © 2000. leofoo ®. MIR Web Development Team.

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.