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Photo Forum / Digital Photography / DSLR Cameras / February 2007

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MT-24EX extension cable

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Marcus - 19 Jan 2007 16:50 GMT
I would like to use one of the flash heads from my MT-24EX dual macro flash
about 3 feet from the camera. Has anyone out there cut the cable and added
an extension? Perhaps it would be possible to use a connector so that the
extension could be removed when using it normally?

Any experiences or (educated) guesses? Thanks for any input!

Mark
eawckyegcy@yahoo.com - 19 Jan 2007 17:12 GMT
> I would like to use one of the flash heads from my MT-24EX dual macro flash
> about 3 feet from the camera.

Go to B&H's website and look for "off shoe cord".  There is a 3' one
for $40.
Mark - 19 Jan 2007 17:55 GMT
>> I would like to use one of the flash heads from my MT-24EX dual macro
>> flash
>> about 3 feet from the camera.
>
> Go to B&H's website and look for "off shoe cord".  There is a 3' one
> for $40.

I know, but what I want to do is keep the flash body on the camera and
remotely mount the head. I want to use it in a zoo to light small enclosures
through glass. I'm thinking to mount the head in a suction cup mounted
housing in which I can control the angle of the head and still keep any
reflected light from exiting backwards.

Mark
Prometheus - 19 Jan 2007 19:36 GMT
>I would like to use one of the flash heads from my MT-24EX dual macro flash
>about 3 feet from the camera. Has anyone out there cut the cable and added
>an extension? Perhaps it would be possible to use a connector so that the
>extension could be removed when using it normally?
>
>Any experiences or (educated) guesses? Thanks for any input!

I do not have such a flash unit, but I would expect three or four wires,
perhaps with one of them serving as a screen, the trigger line might be
co-axial to improve performance although it probably does not need to be
over the short distance in normal use. If I needed to do such I would
open the units and examine the wires before I decided what connectors
and cable to get. Bear in mind that the trigger is a few kV and so it
will need good insulation, and the main flash current is quite high so
it will need to be low resistance.

I would much prefer getting a separate flash gun for the application, or
perhaps the remote mounting cable for using flash with the camera.

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There are always two people in every picture: the photographer and the viewer.
~Ansel Adams

Mark - 19 Jan 2007 23:31 GMT
>>I would like to use one of the flash heads from my MT-24EX dual macro
>>flash
[quoted text clipped - 15 lines]
> I would much prefer getting a separate flash gun for the application, or
> perhaps the remote mounting cable for using flash with the camera.

Thanks for the input - I will probably get another flash and off shoe cable.
However, that said, I would think that the trigger circuitry and high
voltage would be in the head, not the body, though I agree that low
resistance (thick wire) would be necessary to tranfer all that energy
quickly.

Mark
David Littlewood - 26 Jan 2007 19:43 GMT
>>>I would like to use one of the flash heads from my MT-24EX dual macro
>>>flash
[quoted text clipped - 29 lines]
>
>Mark

Missed the start of this, so apologies if I repeat anything.

You should be able to determine where the high voltage is generated from
the whine. This is caused by the oscillator driving a high-ratio step-up
transformer, which produces the high voltage. So, if the whine is in the
head, it is a reasonable inference that the high voltage is generated
there, not transmitted along the connecting wire.

However, I would use this as a working assumption, and check carefully
before poking a finger inside anything!

David
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David Littlewood

Mike Fields - 26 Jan 2007 22:20 GMT
>>>>I would like to use one of the flash heads from my MT-24EX dual
>>>>macro
[quoted text clipped - 55 lines]
>
> David

Be VERY careful - the amount of energy stored in those photoflash
caps can be lethal !!  No, I'm not kidding -- and they are NOT totally
discharged after firing either.  The old sign I remember seeing in the
Popular Science mags etc about "gefinger poken und spitzen sparken"
comes to mind.  Them suckers are capable of burning then end of a
screwdriver off when fully charged.

mikey
Paul Furman - 08 Feb 2007 01:01 GMT
> "David Littlewood" <david@nospam.demon.co.uk> wrote in message
>>>>
[quoted text clipped - 51 lines]
> comes to mind.  Them suckers are capable of burning then end of a
> screwdriver off when fully charged.

Yeah I disassembled a broken D70 & the sparks did a little spot weld job
on my rubber handled wire cutters. I had just tested the flash a minute
previous. Got my heart beating! Felt stupid & lucky.
 
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