Looking for Answers about Nikon Inc. SU-4 Wireless Remote TTL Flash Controller?

The SU-4 Wireless Remote TTL Flash Controller enables wireless remote flash with automatic TTL or manual exposure control.

No, the sb400 has no wireless capability

D5000 does not have a commander mode.

SB400 cannot be used as an off camera slave.

Yes, you can use the D300s with the SB-800 as a commander and the SB-28 on the SU-4 as a secondary unit.

Yes, you can use the SU-4 with the SB-22.

Yes it will work but you really dont need it if you are trying to get flash off camera. Just use your D90 in commander mode to control your SB-600

Yes, you can use the SB-600 mounted in the SU-4 (will convert the speedlight into an optical slave) and trigger it with the flash from the D3000. Please note that pre-flash may occur if there's low light condition for metering.

The SU-4 will detect the firing of any flash in order to trigger the slave unit, but we cannot guarantee functionality with a third party product.

You'll need the SU-800 Commander in order to trigger the SB-600 off the P7100.

The SB-700 can only be used as a remote flash unit in SU-4 type wireless multiple flash-unit photography. Please see page # D-18 of the user's manual for the SB-700 Speedlight.

You are correct. The Nikon D5100 built-in flash can trigger (but not command) the SB-600 with the SU-4 attached to it.

Note that it is not a wireless commander so iTTL (Nikon CLS) is not available. Instead an old-TTL mode which is (to my knowledge) not available on modern Nikon digital bodies is. However, most people shooting this way will use set the SB-600 into manual mode.

Note that the SB-800 has the SU-4 mode built in. I believe the SB-900 does also.

The SU-4 is a handy wireless accessory that allows two or more Speedlights to be used in multiple lighting setups. By attaching a slave flash Speedlight to the SU-4’s accessory shoe, the SU-4’s built-in light sensor remotely detects when the master, on-camera Speedlight fires to trigger the slave flash unit.

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I doubt it. the SU-4 won't fit onto the V1 as it has a completely different flash mount as far as I am aware. The 1 series doesn't have the creative lighting system which is used to trigger and control a slave flash . The minimum camera you need to do it through a pop up flash is the D90, though the D5100 does have the CLS it can't activate through the pop up flash. I am not an expert on the Nikon 1 series though so I could be corrected.

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Yes, you can use the SB-28 mounted in the SU-4 (will convert the speedlight into a slave). Please note that pre-flash may occur if there's low light condition for metering.

The SU-4 will convert the speedlight into a slave. The settings for High Sync photography needs to be verify in the speedlight.

Yes, you can use the SB-400 on the D2x in order to trigger the SB-600 mounted on the SU-4.

Hi
According to the specs for the SU-800, it is infrared, I assume the SU-4 would be the same.
I own the SU-800 and have never had it not transmit a signal, but have never used it outdoors behind obstacle while shooting indoors. The transmission specs for my SU-800 are 66 ft. for transmission range.
I hope this might help you, if not I would contact the service and support team with your question.