Can I use a Nikon 35mm f/1.8G on a D7000 with a cheap non-electronic extension tube?
Asked 4/3/2012
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I bought an inexpensive extension tube for my Nikon D7000. It has no electronic contacts or autofocus support. When I mount my AF-S DX 35mm f/1.8G on the tube, the viewfinder and image are very dark, and the camera shows F0.
I understand G-type Nikon lenses do not have an aperture ring. Does the lens stay at its minimum aperture when used on a tube like this? Is there any way to control the aperture from the camera body, or is this setup only usable in a limited way?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
2 Answers
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If you use a cheap extension tube without CPU connections between the lens and the camera, then as far as the camera is concerned there is no lens connected, which is why it says F0.
The lens automatically closes to its smallest aperture when it's detached, and if your extension tube doesn't hold it open, it will stay that way, because without a CPU connection, there's no way for the camera to control any part of the lens.
You can still take photographs, by setting the camera to Manual mode (M on the dial), but you will need long exposure times to get enough light in to expose properly.
The best solution would be to buy an old lens with a manual aperture ring; they are quite cheap. This will allow you to get decent shutter speeds using Manual mode. Otherwise you will need to invest in a set of extension tubes with a CPU connection.
Originally by user3205. Source · Licensed CC BY-SA 4.0
user3205
14y ago
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Yes, but with important limits. A cheap extension tube with no electronic contacts makes the camera think no lens is attached, which is why the D7000 shows F0. With no electronic or mechanical linkage, the camera cannot control the lens aperture.
On a Nikon G lens, the aperture normally returns to its smallest setting when detached. So with a non-coupled tube, the lens stays stopped down, making the viewfinder very dark and requiring long exposures.
You can still shoot in Manual mode, but exposure will be difficult because so little light is reaching the sensor.
If you want extension tubes to work normally with that 35mm f/1.8G, you need tubes that pass through the electronic contacts. Another workaround is physically holding the aperture lever open with a small piece of tack or tape, though this is awkward and not very elegant. A simpler low-cost option is using an older manual-aperture lens with the tube.
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