| Joined: | Mon Apr 2nd, 2012 |
| Location: | Carthew, Cornwall, United Kingdom |
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In Aperture priority mode you also need to adjust the Menus settings so that they are set to TTL for the flash to work with the camera.
This assumes you are using a Nikon SB400, 600, 800, 900. If you are using an earlier Nikon SB models then it should still work.
Also in the Flash menus there is an ability to choose your flash shutter speed. This needs to be set to 1/60 or if you use the FP mode then it can be 1/250 with the newer Nikon flashes.
Not sure that the D3100 offers this in flash mode but probably. Also make sure your metering mode is in Matrix not Spot.
If you look at your Menu settings I will bet that they are set to Manual, or Commander or something else.
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