Canon lens manual aperture control

The aperture ring of most Canon FD lenses is equipped with click-stops for full and 1/2 f/stops, but can be set between these click-stops. If the accessory used is manual, it will be necessary to set an FD lens for manual diaphragm control before stopped-down metering is possible (see pp. ). An FD lens is designed for full-aperture. In manual mode you set both the shutter speed (via the EOS body) and the Aperture (via the aperture ring on the lens) yourself. In Aperture Priority mode you set the aperture on the lens and allow the EOS body to determine the shutter speed.  · I hear a lot of talk about using manual aperture lenses with the 5DII to control aperture for video. Many are using Nikon or Zeiss glass for this. My questions is this: Is there a way to turn a normal Canon EF lens into a complete manual lens to be used on a Canon camera?

Of course, you can shoot with the aperture ring wide open, just like the cheaper adapters with no ring, and of course, using a lens with a built in manual aperture control is no problem. You can just activate the adapter's aperture ring in a pinch in brighter light and accept the drawbacks of the vignetting and uncertain aperture. Most lenses produced for Canon EF mounts (excluding Samyang/Rokinon lenses along with a few non-mainstream models) have an auto iris aperture control. Even Zeiss manual focus lenses in Canon (ZE) mounts have automatic irises, and Samyang/Rokinon is retooling many of their lenses with AE versions with auto aperture control. I've just posted a video showing how a Nikon lens with a manual iris gives full control of aperture after you lock exposure on the Canon Eos5DmkII. Eos5DmkII with Nikon Manual lens aperture control test on Vimeo There is just no way to do this at speed with an EF lens. Dan.

Some of the R and FL lenses are preset lenses, that is the user needs to manual stop-down the aperture prior to shooting. They feature 2 aperture rings, one for setting the other to stop-down. One would meter and set the aperture, focus and then use the second ring to stop down just before shooting. Historically, switchable automatic / manual aperture controls came next. They have a single aperture ring, a separate "AUTO/MAN" switch, and a little pin on the rear (camera side) of the lens. The photo here shows a Pentax Super Takumar 28mm f/ lens which is of this type. In manual mode you set both the shutter speed (via the EOS body) and the Aperture (via the aperture ring on the lens) yourself. In Aperture Priority mode you set the aperture on the lens and allow the EOS body to determine the shutter speed.