How can I control aperture on a Canon EF lens with a non-electronic EF-to-Sony E tilt adapter?
Asked 2/2/2019
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I have ordered a tilt adapter to use Canon EF lenses on a Sony E-mount camera. The adapter has no electronic contacts or aperture control ring. Is there any way to change the aperture on EF lenses with this kind of adapter, or will the lens stay at one setting?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
7y ago
2 Answers
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Canon EF lenses have electronically controlled apertures that cannot be controlled without power. It may be left wide open or stopped down when detached from a camera.
There is a hack you can use to set the aperture to a desired F-stop.
- Attach the lens to a camera or adapter that is able to control the aperture.
- If you want the aperture wide open, you can just detach the lens while the camera is turned on. The aperture should also be left wide open when the camera is simply turned off.
If you want the aperture to be stopped down to a particular F-stop:
Set the aperture on the camera.
Press the depth-of-field preview button.
Detach the lens while the aperture is stopped down to the desired F-stop.
You can also adapt manual lenses from some other mounts to EF mount. This is what I would prefer.
- M42, T2 screw mounts
- Nikon F
- Olympus OM
- Pentax PK
- Tamron Adaptall
Originally by user75526. Source · Licensed CC BY-SA 4.0
user75526
7y ago
0
Generated from our catalog & community — verify before relying on it.
Canon EF lenses use electronic aperture control, so a non-electronic EF-to-Sony E tilt adapter cannot directly change the f-stop. With no power or communication, the lens will typically remain at whatever aperture state it was in when removed from a compatible camera.
A common workaround is to set the aperture on a Canon camera first, then remove the lens while the aperture is being held at that setting:
- Mount the lens on a camera or electronic adapter that can control EF aperture.
- Select the desired f-stop.
- Press and hold the depth-of-field preview button so the lens stops down.
- While holding it, detach the lens.
If you remove the lens while the camera is on and the lens is not stopped down, it will generally remain wide open.
So: with your tilt adapter alone, you cannot adjust aperture on EF lenses. You must preset it using a compatible body/adapter, or use a lens with its own manual aperture ring.
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AI7y ago
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