Re: Gum prints by enlargement

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From: Richard Maddox (slow_emulsions@yahoo.co.uk)
Date: 05/05/00-07:46:33 AM Z


Strobe light is rich in UV RADIATION.

I don't mind calling UV and infrared RADIATION
"light", I know what you mean... but I belive proper
usage dictates reserving the term to radiation which
allows for normal (human) SIGHT.

R.M.

--- James Romeo <jromeo@iopener.net> wrote:
> I wonder if strobe light could be used for a light
> in an enlarger for alt-process.
> There can be a lot of light from strobe the color
> temp is daylight. Is eny of it UV?
> I have often thought of it as I work with the 8x10
> enlarger.
> The modelling light could be used for setup and
> exposer by number of flashes.
> The ???? is there UV I do not know.
> James Romeo
> ----- Original Message -----
>
> From: alt-photo-process-l@sask.usask.ca
> To: "INTERNET:alt-photo-process-l@skyway.usask.ca"
> <alt-photo-process-l@sask.usask.ca>
> Subject: Gum prints by enlargement
> Date: Fri, 05 May 2000 07:58:19 -0400
>
> Replies:
> 1) The inverse square law applies whenever a light
> source spreads out with
> distance, as it does with enlargement. The idea is
> that a 1x1 inch square
> of light becomes a 2x2 inch square of light when
> you double the distance
> to the paper. A 2x2 inch square of light is 4 times
> the area of the
> original square. Each 1x1 square therefore receives
> 1/4 the original light
> - and needs 4x the exposure to compensate.
>
> 2) Light is a continuum. Gamma rays, X-rays, UV
> light, Visible light, IR
> light, Microwaves, and Radio waves are all the same
> thing at different
> frequencies. Thus I see no problem calling UV a
> light. Cheers, Ed
>
>

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