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

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A 2X Teleconverter multiplies focal length of primary lense by a factor of 2X. while on the other hand, it decreases the effective aperture of the primary lens by two f-stops. The Olympus 2X-A is also designed to be used with a specific group of Zuiko lenses - those without deeply recessed rear elements, a design popularly found on lenses of shorter focal length. Olympus indicates Zuiko 100mm f/2.8, Zuiko 135mm f/2.8, Zuiko 135mm f/3.5 , Zuiko 200mm f/4.0, Zuiko 200mm f/5.0 or Zuiko Zoom lense 100-200mm f/5.0. Although I know it can be quite tempting to use it with other Zuikos, but such combination may compromise the lense in some optical drawbacks such as vignetting or some other optical deterioration may also occur. Thus, it is also advisable to follow strictly within the guidelines laid by the manufacturer in relation to selection of the respective teleconverter in combination of lens/converter. Although I have heard many positive remarks relating to this convenient Zuiko optical device, and although I would also believe great attention has been given to ensure it can optimize the optical excellence of the Zuiko lense in use, but depends on combinations of other variable factors, they may also have some inherent limitations too, so use them wisely and it is a good idea to listen and share your experience with others.

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Anyway, the biggest advantage of a converter is, it offers photographer a speedy way of installation as they can be mounted in seconds between camera and lens to double the focal length. Besides, they are compact enough to carry around as good supplementary alternative for photographers who are always on the move. Further, these devices are also excellent tools to increase the magnification ratio as closest distance of the primary lens will NOT be affected even at doubling of the primary focal length - a feature great for shooting hazardous objects or for closeups. Lastly, Teleconverters are always much cheaper than investing into another comparing lens of equivalent focal length after magnification - probably, this is the single reason why it is such a popular optical accessory used among the many amaterurs and serious photographers.

<<< -- 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.

Zuiko Auto Tele-Converter 2X-A

When attached to a appropriate
* OM lense, this unit will double the focal length of the primary lense, while on the other hand, falthfully maintaining its intrinsic characteristics. For example, the unit will convert a 100mm Iense into a 200mm and the 200mm Iense into a 400mim to produce more impressive telephoto effects in a most convenient way. The autornatic diaphragm and meter coupling as well as the minimum focusing distance of the main lense are retained, extending the pleasure of telephotography. As the lense speed of the primary lense is halved (f/2.8 --> f/5.6; f/4.0 --> f/8.0), focusing must be made on the matte area. Recommended focusing screen - 1.4 all matte type.

* Zuiko 100mm f/2.8, Zuiko 135mm f/2.8, Zuiko 135mm f/3.5 , Zuiko 200mm f/4.0, Zuiko 200mm f/5.0 or Zuiko Zoom lense 100-200mm f/5.0

Credit: Images courtesy of Mr. Eric Garant®<>. All images appeared herein are Copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

1) Aligning red dots, fit the 2X-A conveter into camera and turn until it stops with a click.
2) Aligning red dots, fit main lens into 2X-A and turn until it stops with a click.

Main Specifications:

Applicable Zuiko Lenses: Zuiko 100mm f/2.8, Zuiko 135mm f/2.8, Zuiko 135mm f/3.5 , Zuiko 200mm f/4.0, Zuiko 200mm f/5.0 or Zuiko Zoom lense 100-200mm f/5.0
Mounting: OM bayonet mount (between camera and lense)
Focal length Conversion: 2X
Lens speed reduction: two f-stops
2xlenseschart.gif teleconx2.jpg 2xaoptic.gif
Optical Construction: 6 elements in 6 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
Minimum subject area with primary lense: That of the main lense is quartered
Focusing: via focusing ring of the primary lense
Length: 48mm (1.9")
Maximum diameter: 62mm (2.5")
Weight: 215g (7.6 oz)

Caution: 1). The unit is designed for use with either one of the 6 lenses mentioned above. If you intend to use it with other lenses, their original performances will be reduced. Also note: lenses with 55mm or shorter are not advisable to be used; 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.

| PREVIOUS | 2/2 the Olympus 1.4X-A

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.