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Heritage Cameras Description

Reduce the focal length and increase the aperture of manual Canon EOS-fit lenses for 35mm or digital SLRs on Micro Four Thirds digital cameras

Multicoated glass optics to reduce focal length by
0.73x and increase maximum aperture by one stop
Auto or manual exposure, manual focusing only
Fits all Olympus, Panasonic and other Micro Four
Thirds mirrorless digital compact system cameras
Infinity focus maintained for manual EF fit lenses
Further adaptable to CY LR M42 OM PK NF fittings
Accepts most Canon EF and EF-S or independent
EOS SLR lenses, but usable at full aperture only
NOT for Canon STM types, other focus-by-wire
Nicely made with very solid all-metal construction
Very good condition, includes front and rear caps

This focal reducer allows you to use manual lenses in EOS fitting (plus others with extra adapters) on Micro Four Thirds mirrorless digital cameras including the Olympus Pen and OM-D, OM System and Panasonic G series models. The optical system reduces the focal length and increases the maximum aperture. Manual lenses such as Samyang are fully compatible, while Canon EF, EF-S (but not STM or some others) and many independent EOS-fit lenses work at full aperture only, but with auto or manual exposure. This Lens Turbo II is in fully working order and good used condition, supplied with front and rear caps. Please read the full description for more important compatibility information.

Focal reducers work like a teleconverter in reverse – by concentrating the image from a lens onto a smaller area they widen the angle of view and increase the maximum aperture. This one has a magnification factor of 0.726x and aperture increase of 0.97 f-stops. For example, a 28mm f/2.8 wide angle lens becomes a 20mm f/2 with the focal reducer, a 50mm f/1.8 becomes a 36mm f/1.3 and an 85mm f/1.4 becomes a 62mm f/1.0. This description is copyright © Heritage Cameras. APS-C lenses usually have shorter focal lengths yet benefit from the same optical changes, so an 18-55mm f/3.5-5.6 becomes a 13-40mm f/2.5-4. As with all lenses on Micro Four Thirds the field of view is reduced due to the smaller sensors, so a 2x crop factor is applied to all of the above. The glass is multicoated (MC) for reduced flare and light loss with increased contrast and colour fidelity. The optical design uses four elements including one which is Extra-Low Dispersion.

The adapter is a fully manual type with no electrical connections for features such as AF, image stabilisation or electronic diaphragm operation, so is best used with manual lenses, either in EF fitting or others with extra adapters. Instead of buying several focal reducers for Contax/Yashica, M42 screw, Leica R, Nikon F, AI and some AF, Olympus OM and Pentax K lenses, you could use them all on this one with extra inexpensive adapters. You can use most Canon EF, EF-S and independent lenses that have mechanical focus rings connected to their focusing mechanisms, at full aperture only. Most of the MFT cameras have some manual focusing aids including image magnification and/or focus peaking. As auto focus doesn't work anyway, you can use many of the older lenses that either have faulty AF motors, or are incompatible with modern EOS DSLRs (especially early Sigmas), and these can be very inexpensive. Manual focusing to infinity is maintained (it may focus slightly beyond infinity with some lenses).

PLEASE NOTE: All Canon STM and some L-Series lenses use a "focus-by-wire" system, where manual focusing is still performed by the AF motor. This system doesn't work with manual adapters, so the lens can't be focused. It's also not suitable for the autofocus-only EF 35-70mm A, 100-200mm A and 35-80mm Power Zoom lenses.

The camera's exposure meter works in aperture priority automatic or manual exposure modes with stopped down metering. In auto mode the camera sets the shutter speed automatically, and on manual you adjust the shutter speed until the camera indicates the correct exposure. EOS-fit lenses with a mechanical aperture ring for manual diaphragm control such as the Samyang (Bower, Rokinon, Vivitar etc.) types will work normally at all apertures, as will other fittings used with extra adapters (see below). As there are no electrical contacts Canon EF, EF-S and other EOS-fit auto focus lenses remain at full aperture, and there's no way to directly adjust this setting when using a manual adapter. There is a workaround for this, but it involves having access to an EOS body so isn't an ideal solution.

You can either fit the adapter to the lens first and bayonet the combination onto the camera(s), or fit the adapter to the camera first and attach/remove lenses as required. The adapter locks securely onto the camera and is released using the button on the body, and lenses are removed using the release button on the adapter (it slides backwards to unlock). This Zhongyi Lens Turbo II EF-M43 is made entirely from metal and glass with a black anodised body with integrated rear MFT mount, and stainless steel EF front mount. It adds only around 21mm (0.8") to the length of the lens when attached, is up to 65mm (2.6") in diameter and weighs approximately 115g (4oz) without accessories.

An essential accessory for Micro Four Thirds digital cameras and many EOS-fit lenses.

Compatibility

This adapter is for fitting MANUAL lenses with Canon EF fitting onto Micro Four Thirds mirrorless digital cameras, as follows:

Camera Compatibility
The adapter fits MFT (m43, u43, m4/3) cameras such as the Olympus Pen E-P series, Pen-F, OM-D series and Air A01, Panasonic Lumix DMC G, GF, GH, GM and GX series, OM Systems OM-series, plus the Kodak Pixpro S-1 and YI M1. As Micro Four Thirds is a multi-manufacturer standard it should also be compatible with any future models.

Suitable digital video models include the Blackmagic Micro Cinema, Micro Studio 4K, Pocket Cinema and Pocket Cinema 4K cameras, Panasonic AG-AF100 series, plus the Z Cam C1, E1 and E2, etc.

Please note that it's NOT suitable for Olympus, Panasonic or Leica Four Thirds (FourThirds, 4/3) digital SLR cameras, Panasonic S L-Mount full frame mirrorless digital cameras, any film SLRs, digital models with fixed lenses, any other makes or models.

Adaptable for other lenses
The EF mount is very versatile in that additional adapters are also available (not included) for many other types of lens and accessory, including Contax/Yashica, M42 screw, Leica R, Nikon F, AI and some AF, Olympus OM, Pentax K, T2 (T-mount) and Tamron Adaptall, Hasselblad V, Mamiya 645, Pentacon Six/Kiev 60, Pentax 645 and Pentax 67. In all these cases, infinity focus is maintained.

Lens Compatibility
The adapter accepts the vast majority of Canon EF and EF-S lenses, plus independent lenses in EOS fittings. In all cases focusing is manual, and exposure works in metered manual or aperture priority auto modes, with stopped down metering (usually at full aperture only – see the description above). It's NOT really usable with "focus-by-wire" lenses such as Canon STM, Nano USM and some L USM types, or the autofocus-only EF 35-70mm A, 100-200mm A and 35-80mm Power Zoom lenses as there's no way to adjust the focus setting. Canon USM lenses that are focus-by-wire include the EF 85mm f/1.2 L, EF 85mm f/1.2 L II, EF 50mm f/1 L, EF 28-80mm f/2.8-4 L USM, EF 200mm f/1.8 L USM, EF 300mm f/2.8 L USM, EF 400mm f/2.8 L USM, EF 400mm f/2.8 L II USM, EF 500mm f/4.5 L USM, EF 600mm f/4 L USM and EF 1200mm f/5.6 L USM. Canon Nano USM lenses include the EF-S 18-135mm F3.5-5.6 IS USM and EF 70-300 F4-5.6 IS II USM. To check whether a lens is suitable, remove it from the camera and set focus to M. Turn the focusing ring and observe whether the distance scale (if fitted) changes and internal elements move. If they do, the lens can be focused manually on a manual adapter.

This adapter is NOT suitable for Canon R, FL, FD or EX lenses for manual focus film SLRs, AC autofocus optics for the T80, EF-M lenses for the EOS M series, RF lenses for the EOS R series or any other types.

Please contact us before buying if you have any questions about compatibility with your equipment. E&OE. Text and images are copyright © Heritage Cameras 2024, and may not be used without permission.