| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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Welcome to the forum.
This seems like one of those problems which it would be easier to solve in person rather than at a distance! Have I got this right? This is a ring flash, it works OK without the extension tubes but not with them... The flash screws onto the front of the 105 Nikkor...
How are you connecting the flash to the camera? an adaptor off the flash shoe or from the flash socket on the camera body?
From a purely electrical point of view I just wonder if the lens needs to make electrical contact with the camera body... The Kenko? tubes are plastic.
I am a bit sceptical about using the zoom for close up when you have the Micro Nikkor 105 D. Except for trying to narrow down this problem of course!
I would not recommend using an 'old' flash intended for film, on a DSLR because the trigger voltages on the old flash units can be quite high and can destroy the circuit boards in a DSLR.
One sure way to trigger the flash is to use a flash relay like the Nikon SU4, triggered by the onboard flash.
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Robert.