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I have had this problem with this dishwasher in my rented apartment occasionally since I moved in. It would usually reset itself if I let it sit a while, but not today. Today all it would do is flash and beep and I finally just unplugged it. I stumbled across this page and read the post by Dyons above and it worked. Close the door, let it grind away and within 2 minutes it will reset itself. Thanks, Dyons!!!
As a slave, yes, though you won't get any of the features of a Nikon CLS-compatible flash unit. You would be shooting in manual flash mode. Due to its higher trigger voltage, I would NOT put the unit onto the camera itself.
A red flashing lightening bolt can mean different things on different camera's. The most common are that you are too far away from the object you want to take a picture of. That the flash on the camera needs to be turned off and that the flash itself is charging up and won't allow a picture to be taken.
Try turning the flash off and see if it will let you take a picture.
Firstly, be sure to check flash voltage. Your 30D may accept max 6V so that your camera can be shot if the flash unit has higher voltage than 6V.
1. Use low ISO to keep low noise....around f/8 or more depends on your need and how much DOF you want.....Set the shutter speed around 1/125 to your max speed to stop any movement (your subject or camera itself shaking).
2. Above is set in Manual mode (iso100, f/8 1/125 or 1/250), then you just need to leave the flash to work in TTL mode.
3. It needs battery, the connection is for syncing to trigger and release a proper flash power (in TTL mode).
Hope this help!
SIMPLE Fix. I have mended about 5 of these with the same fault. It is a
very common fault. Basically due to the way the flash has been designed
the flash pops up far too violently, this causes a lot of stress within
the lens. This in time causes the Flash cable to come loose from the
socket. Simple repair, just insert the cable back into the socket. Also
causes the screws at the front of the lens to come loose too. To
repair, simply, remove the extenal flash bracket and screws, and remove
the screws to the Left of the lens (As you are looking into the lens)
This will remove the LEFT pannel on the lens. Towards the back (Camera
side) of the lens there is a socket arpprox 10 Pin and a ribbon cable,
It may look like the cable is in the socket but normally it is just
sitting on the edge. Push this cable back in. FLASH should work again,
Best to tape this down to stop it happening again. GOOD LUCK.
The best way is to keep the flash as far away from the lens as possible. If you have the option of using an external flash, that would be a great solution. You can also use ?Bounce Mode? to change the light dispersion around the lens.
Another possible solution would be to bypass the use of flash by giving more exposure time or opening the shutter. In a case where the lighting is marginal, these actions can replace the use of flash.