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I have a Nissin Di622 for my nikon D90 when the flash head is at 90 degrees pointing straight ahead on the TTL setting the flash is poor and the picture badly under exposed, regardless of lens, ISO, or shutter speeds. it is now 15 months old, I took it back to the dealership just after I bought it, to no satisfaction so I've just left it one side, feeling very disappointed and a waste of money, is anything I do now about it?. Thanks,