It's my first time here at this forum and I hope I could get answers from Nikon users here. I'm using a D5000 with SB600 flash and I'm experiencing this problem of my flash not firing consistently. It used to work just fine but now even if my batteries are fully charged there would be times where the flash output is not on a level where it should be. Thus, I have underexposed pictures. The flash displays a blinking negative values of exposure.
Without changing the setting the flash output is sometimes good sometimes not. It could be that it's only a "camera settings" problem or my flash is the one that's having an issue. What's your take guys?