[LargeFormat] Falsh Bulbs (was Re: On Location)

[Les Newcomer]

Press 40s are the size of a 25 watt bulb and one or two shouldn't have an
effect on shutter contacts.  the biggest, No3s and No75s were designed more
for 110v banquet style.  I've successfully shot three of these off on an
ancient 15amp breaker panel that I'm certain Thom Edison wired himself (the
subject was the 50th anniversary of Ben Lovett's dancing classes sponsored
by Henry Ford at Greenfield Village

Graflite and Graflex battery cases take two or three D sized batteries and
there were extenders to bing the total to 5.  Beyond that they used a 6volt
hotshot battery or a car battery in a relay system. It runs in my mind that
Graflex said the batteries needed rate of 7amps but they never said how that
was had. (short circuit with an ammeter would only get you a fried ammeter)
les

> From: Clive Warren <cocam@cableinet.co.uk>
> Reply-To: largeformat@f32.net
> Date: Fri, 22 Feb 2002 00:31:30 +0000
> To: largeformat@f32.net
> Subject: [LargeFormat] Falsh Bulbs (was Re: On Location)
> 
> At 7:09 am -0800 21/2/02, Les Newcomer wrote:
>> big snip
>>> f/18 is pretty dim for those focal lengths...
>>> 
>>> Jim
>>> 
>> 
>> Yeah for interiors i tried the barebulb flashlight as a focus target
>> technique, but found common flares to be much better.
> 
> Blinded by the light ;-)
> 
> Talking of which, anyone have any idea how much current in amps one
> of the the large flash bulbs (size of a domestic light bulb) takes to
> fire it? I feel some artificial light coming on and want to set up
> some retro flash heads. The Graflex type guns take a few large (D
> size?) batteries, can't remember how many off hand and am too lazy to
> open the case containing the flash gun. They would be capable of
> delivering a hefty amperage though.
> 
> Have seen the results of arcing on the flash contacts on Graflex
> shutter blinds and am thinking about using a small relay to fire the
> flash bulbs with a much lower current being drawn through the shutter
> to actuate the relay which will then fire the bulbs. Don't like the
> idea of trashing the flash contacts in shutters.....
> 
> Before anyone asks - yes the shutters I am thinking of using have a
> bulb setting.
> 
> Cheers,
> Clive
> 
> -- 
> All the best,
> 
> Clive     http://www.f32.net
> 
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