Additional Information on Olympus Zuiko lenses
Tele-Converter/Extender for Zuiko lenses - 1.4X-A/2X-A - Part One

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Tele-Extrenders were believed to have been introduced by third party lense manufacturers. Fits between the camera body and the lense, it provides a easy to use, economical way of doubling the focal length of the primary lenses in use. Olympus has probably introduced their Tele-converter for the Zuiko lenses at second half of the seventies as at the time of introduction of the original OM2, the manual has not mentioned availability of this accessory yet. Such optical device, or more affectionately referred as "Teleconverter" or "Tele-Extender", acts as a negative lens group and extends the focus point of the converging light rays further back. For an example, a moderate focal length such as a 200mm telephoto lens may be "converted" into a 400mm super-telephoto. However, as doubling of focal length while retaining high performance of the original lense can be as complex as designing a new optic.

Unlike many other manufacturers who simply offers an Extender to be used for all lenses under a category, Olympus has adopted a careful and more cautious approach in identifying handful of Zuiko lenses which may have been compatible with the use of such optical device so as to minimize chances of deterioration of optical quality of the primary lense in used. Generally, there are two Teleconverters, one which offers doubling of focal length (2X) and another that provides 1.4X increase in focal length extension. Technically, it can be in greater magnifications but proportionally, they could be technical issues need to be addressed and thus, most manufacturers are contented in providing these two options. The Olympus Zuiko lense family has a Tele-Converter 1.4X-A and Tele-Converter 2X-A to serve needs of OM photographers.

Credit: Images courtesy of Adorama® Inc. "Ebay - Mathew Duren" <ebay@adorama> Webisite URL:, who also operates a popular Ebay Store. All images appeared herein are Copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

Although tele-extender(s) sounds like a brilliant idea as a highly portable, cheap alternative solution to photographic needs. However, they do have some advantages and disadvantages when these devices are used in combination with a primary optic. Firstly, teleconverter not only multiplies focal length, but they also multiply the f-number of the prime lense, as once mounted there will be some degree of light loss in illumination on the working lense and the actual maximum aperture of the lense is effectively "reduced" by multiples, depends on the version of Extender you are using. i.e. 2X Converter needs two f-stops compensation in actual working aperture, 1.4X requires one f-stop exposure compensation (don't worry, the camera's meter circuit will compensate that automatically). This means using tele-extenders may force you to use shutter speeds that are slower than you prefer.

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To offset such negative effect, it is best to use Extender in combination with a main lense that has a moderately fast lense speed. Besides, with today's many of the high resolution fast film types, it is is another alternative way to compensate for lost in lense speed when using such devices in your photography.

<<< -- Credit: Image courtesy of Mr BOB Gries® <> . Bob has a website on his own. Image Copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

However, another interesting aspect in optical nature of a Teleconverters is, minimum distance of the prime lense in used will not be altered. Which means - the minimum focusing distance of the camera lense is unaffected by the presence of a tele-extender. So, for an example, the minimum focusing distance of a ZUIKO-T 200mm f/4.0's (m) 2.5m (8.2ft) will remain unaffected even if it is a "converted" 400mm lense. So, depends on priorities, sometimes an advantage because it allows larger images on the film. It allows you to apply its unique optical behavior in many other applications such close-up photography such as maintaining a more comfortable working distance between the subject and the photographer. In many ways, a slight possible drawback when using such devices is, the viewfinder of the camera will also be dimmed slightly due to light lost reaching the eyepiece which may at times making the split image rangefinder darken and it is good to select a appropriate focusing screen type*.

It certainly sounds like a brilliant idea to use a teleconverter, huh ? Well, not quite - If that was the case, all lenses should have packaged with such a device in the box when you purchase a lense new but Companies usually do not practice such a move - mainly due to commercial reasons which may affect sales of other prime lenses and also because many converters, regardless how these matched converters have been claimed by respective manufacturers that optically they have been designed to approach that of the original lens but generally, it does suffer from some optical flaws as it is not possible to match every lense with different optical design with a converter in place to ensure overall definition for the prime lens not being affected at all. Thus, regardless what lens is used with a converter in place, there will be be slightly decreased in their overall optical performance compared to the original lense when use singularly. Well, although such differences may not be visible via naked eyes or with a 3/4R prints but for purists, such thoughts in their mind may affect a buying/using decision. Anyway, as a general guideline, if you intend to give yourself a treat, always buy from a reputable manufacturer such as the principle and although sometimes I'd love to believe cheap thing can be good but in this area, I would rather advised you - don't buy the cheapest.

Another issue is, general perception is, It is always advisable to use a smaller** lense aperture to increase definition and minimize chances of flare as most often, except when the lighting is ideal, it is quite difficult stopping the aperture to smaller values as the compensated decreasing of working aperture will require the use maximum aperture in order to maintain a workable shutter speed to minimize camera shake. Whatever it is, teleconverter are very popular among amateurs but they are also quite often being used in many professional applications as it offers a cheap, practical means of doubling focal length and easy to carry around However, it cannot be treated entirely as a solution provider, so use them wisely.

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Important Note: * Try not to use a Converter with wideangle lenses. The retrofocus design of these lenses have far more complex optical system and certainly it is not a good idea to add another 6 or 7 more lens elements in between, one of the reason Olympus has against such use. ** Sometimes, certain combinations of various lenses, teleconverter(s) and focusing screen(s) used on respective OM SLRs may require additional exposure compensation, where applicable. The leaflet that comes along with the hardware may outlined the requirements. *** When used with certain lenses, there may be occasional uneven exposure if aperture is set smaller than f/11 or beyond and/or in some cases, may cause vignetting of image.

Credit: Image scanned from a 1986 Olympus OM system Sales Manual.

Teleconverters (or Tele-Extrenders) Olympus Zuiko 1.4X-A

Attached to specifically a handful of OM lenses (
Zuiko-T 250mm f/2.0 ED-IF, Zuiko-T 300mm f/4.5, Zuiko-T 350mm f/2.8 ED-IF or Zuiko-T 400mm f/6.3). this unit increases the focal length of the main lense by a factor of 1.4, while faithfully maintaining its intrinsic characteristics For example. the unit turns the 250mm telephoto lense into a 350mm. and the 400mm lenses into a 550mm to produce more impressive super-telephoto effects in a most convenient way.

RELATIVE: ZUIKO Telephoto lenses | 85mm | 100mm | 135mm | 180mm | 200mm | 250mm | 300mm | 350mm | 400mm | 500mm REFLEX | 600mm | 1000mm

The automatic diaphragm and meter coupling as well as the minimum focusing distance of the primary lense are retained. extending the pleasure of super-telephotography. However, the lense speed of the primary lense will be reduced by one f-stop (f/2 8 -> f/4.0; f/4.5 -> f/6.3). With the 300mm f/4.5 and 400mm f/6.3, focusing must be made on the matte area as the microprism rangefinder spot or viewfinder edge may sometimes becomes darken.

Credit: Images courtesy of Adorama® Inc. "Ebay - Mathew Duren" <ebay@adorama> Website URL:, who also operates a popular Ebay Store. All images appeared herein are Copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

Instruction to use the Teleconverter 1.4X-A:

Aligning red dots, fits the 1.4X-A converter into camera and turn until it stops with a click (a); Aligning red dots, fit primary lense into the 1.4X-A converter and turn until it stops with a click (b)


Applicable Zuiko Lenses: Zuiko 250mm f/2.0, Zuiko 300mm f/4.5, Zuiko 350mm f/2.8 and Zuiko 400mm f/6.3
Mounting: OM bayonet mount (between camera and lense)
Focal length Conversion: 1.4X

14Xoptic.gif 14Xopticlenses.gif
Lens speed reduction: one f-stop
Optical Construction: 5 elements in 4 groups (multicoated)
Diaphragm operation: Automatic (auto operation of main lense is retained)
Minimum focusing distance of primary lense in use: Not affected, similar to the main lense

Focusing: with focusing ring of the primary lense
Length: 23mm (0.9")
Maximum diameter: 63mm (2.5")
Weight: 180g (6.3oz)

| Previous | NEXT | 1/2 Another alternative, the Olympus 1.4X-A Tele-Converter...

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Caution: 1). The unit is designed for use with either one of the 4 lenses mentioned above. If you intend to use it with other lenses, their original performances will be reduced. 2). Beware of camera shake as the possibility of image blur may increase as the lens speed is reduced. 3). The infrared index on the primary lense cannot be used.

Credit: Images courtesy of Adorama® Inc. "Ebay - Mathew Duren" <ebay@adorama> Website URL:, who also operates a popular Ebay Store. All images appeared herein are Copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

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

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 |

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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.