I can not change the "sound field program" mode to other modes (music/movie/sports/game). Also the DEC. MODE button doesn't work. It worked when I first hooked up the system. All other buttons work. What have I done wrong and how do I fix it.
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Set the camera to one of the two remote modes. The quick-response remote mode fires the camera when you press the button. The delayed remote mode gives you two seconds to hide the remote behind your back before firing.
If the menu item is gray it means that you are in a mode that does not allow you control of your flash. You are likely in an auto mode. Change the mode to Manual, Shutter priority, Aperture priority, or Program.
You need to set the camera's release mode to one of the available remote modes. As a minimum there should be a remote mode which fires the shutter when you push the button on the remote and a delayed remote mode which gives you two seconds to hide the remote behind your back. Since you neglected to specify the model of your Nikon dSLR I can't tell you exactly how to change the release mode. Refer to your camera's manual, or else reply to this post and specify the model.
Set the aperture ring to its minimum setting (largest f/number) and leave it there. You control the aperture from the camera body, exactly the same way as on a lens without an aperture ring. In the A mode, simply turn the command dial. In the M mode, hold down the aperture (exposure compensation) button and turn the command dial.
It sounds to me like the electronics in the lens and the camera have a short in their connection.
It's possible that the metering of the camera is causing the change in exposure. You might try recording in Manual mode and see if you still have the same problem.
The blinking f usually means you are in program or aperture priority mode and the f-stop ring has been unlocked and moved from it's maximum aperture or the lens contacts are dirty and not making a good connection.
It's almost certainly got a stripped drive gear. This is not a DIY repair, but if the rest of the lens is in excellent condition and not more than around five years old then it's probably cost effective to get it repaired. Sigma are normally excellent at supplying spare parts for their lenses.
Get an estimate for the work from a photographic repair specialist but be prepared for at least a four to six week turnaround time as that's what I'm currently finding for good repair outlets on both sides of the Atlantic.
Your motor maybe going bad. Try sending it to PhotoTech Repair Service in NYC. They are Nikon authorized, and can do the repair under warranty if you still have it. Also if you join they're facebook page, they will give you a 10% discount.
Here is the facebook page link, it has everything you need to send it in.