The MTF Services Ltd. MTF EFFECT Canon EF to F3 Mount Lens Adapter is a complement to a separately-sold Canon EF Control Unit developed by MTF. Both the adapter and the Control Unit are a pioneering result of a long time of research and discovery. Together they let you control the aperture of a Canon EF-mount lens on a non-Canon, non-EF camera. They moreover let you open up aperture at much more accurate f-stop increments of 1/8, whereas even on Canon cameras aperture opens in increments of 1/3 only. Furthermore, both of the above factors are achievable even on EF lenses that have image stabilization. All of this has never been possible before, and it allows you to use your Canon lenses without aperture restrictions on non-Canon, non-EF cameras.
Previous to this innovation, using an EF lens on a non-EF camera by means of an EF adapter meant that you'd be stuck with the aperture that was already set on the lens, and that the only way to change the aperture would be by dismounting the lens, attaching it to a Canon camera, adjusting the aperture to what you want it at, and then remounting the lens back onto the non-EF camera, and all over again for every adjustment. This is so because Canon lenses have no manual aperture control and are purely electronic, and because a regular EF adapter only lets you mount an EF lens but isn't capable of transferring any electronic information.
This EFFECT adapter though is a bit different than regular ones. It features an integrated cable for use with the EFFECT Control Unit. The cable plugs into the Control Unit and enables lens control, and the Control Unit has a knob that adjusts aperture. Two other EFFECT adapters are optionally available aside from this one. They are an EF to micro 4/3 and an EF to Sony E.
- Complements an EFFECT Canon EF Control Unit
- Controls aperture of EF-mount lenses on non-EF cameras
- Adjusts aperture in 1/8 f-stop increments
- Works with lenses that have image stabilization
- The Control Unit that this adapter is a complement to has successfully been tested with all Canon and Zeiss EF lenses, and successfully with most third party EF lenses, but may not work with -- it may not succeed in controlling the aperture of -- some third-party EF lenses