Re: D70 Fill flash overexposed wildly

In article <d05Ke.65295$_I2.2762@xxxxxxxxxxxxxxxxxxxxxx>,
Matt Clara <no.emailz@xxxxxxxxxxxxxxxxx> wrote:
>"McLeod" <cerveza@xxxxxxxxxxxx> wrote in message
>news:tcmcf1lbc7rr6ku8grna21rth7ivcnjl60@xxxxxxxxxx

[ ... ]

>> You will only get a partial frame exposed with flash if you go higher
>> than 1/500. If the shutter in the D70s travels vertically you will
>> end up with only the top or bottom half lit by the flash. Over 1/500
>> of a second the whole sensor will never be exposed at the same time,
>> the shutter becomes a moving slit.
>
>That's not true, as the D70 is relying on an electronic shutter at 1/500th
>and faster. I've used the D70 with studio lights, set on manual up to
>1/8000th of a second. Some weird artifacting happens at those speeds,
>though.

I suspect that you are experiencing "ringing" (periodic
variation of the brightness) at those speeds -- especially if you are
close to the start of the flashlamp's output (as would be reasonable to
expect). Ringing (of voltage) is a common phenomenon in electronics
with high-speed pulses, and it would be reasonable to expect it to
affect the light output during that period.

It is possible to design the circuitry to minimize ringing, but
I doubt that this ever became a matter of importance before now in
studio strobe lights, as it all averages out in the film or sensor at
normal shutter speeds.

Hmm ... I wonder whether I could use high shutter speeds to
reduce the light from the old Medical Nikkor's ring flash. The D70's
minimum of 200 ISO (ASA) limits how close I can get with that and get
reasonable exposures, but a high manual shutter speed selection might
work for me. Better than getting a neutral density filter to go between
the lens and the screw-in close-up lenses which accompany it.

Enjoy,
DoN.
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