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Recently I bought a reversal ring for my Canon 700D, to take macro photography. I reversed an 18-55mm kit lens. When I tried to take photos, the aperture went to f00. What can I do to set the aperture?

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There is no electronic connection between the lens and the body. Except if you have bought the macro adapter.

If you want to control the aperture, you have two options:

  1. Buy an adapter that provides the communication between the body and the lens.
  2. Use an old (any brand) lens with a manual aperture setting. The old auto aperture used a mechanical contact (pushpin for M42 mount, lever for F-mount) to control the aperture from the body. The automatic ones without A/M switch will always be wide open. Some lenses can be set to "manual" mode and the aperture can be controlled directly. Some lenses are fully manual and aperture is controlled directly.
  3. Cheat the lens to "remember" the last aperture setting, as @Michal Clark noted.

In both cases you should be able to shoot in A/S/M modes. For P and auto I'm not sure.

Options sorted by price: 3 - 2 - 1.
Options sorted by user comfort: 1 - 2 - 3.

  • There is a third option to control the aperture. – Michael C Mar 27 '17 at 12:20
  • @MichaelClark true, but I think it is possible to control the apperture this way. But is it useful? – Crowley Mar 27 '17 at 12:35
  • It's useful if you want to shoot with the lens stopped down when it is reversed. It's certainly more useful than not being able to control the aperture at all when using a reversing ring. – Michael C Mar 27 '17 at 12:38
  • If you have old manual lens, or you can buy one for reasonably low price, it is much easier to turn the ring. I am using old Porst and Reuvenon lenses I bought for old Petri SLR earlier. If you want to change the apperture of EF lens, you have to re-attach it to the body and change the setting. – Crowley Mar 27 '17 at 12:44
  • A lot of macro work is done at a constant aperture. In which case it is a rather elegant solution. – Michael C Mar 27 '17 at 12:47
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You can do nothing as reverse ring do not provide any electrical contacts/connection from lens to the body. You can still shoot but you should get it mind the aperture you use for those shoots.

Also is good to make the aperture smaller than fully opened to increase depth of field in the macro photography

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