[pure-silver] Re: I GUESS NOT was ANYONE TRY THIS SILLY IDEA?
- From: Speedy <speedgraphic@xxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 27 May 2011 11:39:07 +0000
One other issue is that the florescents also stay "on" for a period even after
they are switched off. If used the shutter would be necessary.
I think Claudio is on to something with the LED's. I think if an alternate
becomes necessary that is the way to go...
Speedy
Date: Fri, 27 May 2011 12:17:50 +0200
From: claudio@xxxxxxxxxxxx
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: I GUESS NOT was ANYONE TRY THIS SILLY IDEA?
Hi Bob,
You can add also that these bulbs take time to switch on and output power
varies depending how warm they are.
That may give some difficulties to ensure repeatibility in exposure.
A good way to use them would be to let them on and use a shutter, that should
ensure a good consistency.
Leds are another option, power is increasing although still a bit low.
White leds can be used with usual filtration or a mix of blue/green in an
additive filtration mode for multigrade.
I had a project in the cartons using a RGB color head with leds where the
duration of exposure of each color is variable instead of varying the output
power. Maybe one day ...
Claudio Bonavolta
www.bonavolta.ch
----- Message d'origine -----
De: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
Date: Thu, 26 May 2011 14:54:46 -0400
Sujet: [pure-silver] I GUESS NOT was ANYONE TRY THIS SILLY IDEA?
À: <pure-silver@xxxxxxxxxxxxx>
Hmmm, not one reply. I guess no one has either tried it or thought it worth
trying.
CHEERS!
BOB
From: BOB KISS [mailto:bobkiss@xxxxxxxxxxxxx]
Sent: Wednesday, May 25, 2011 1:57 PM
To: 'pure-silver@xxxxxxxxxxxxx'
Subject: ANYONE TRY THIS SILLY IDEA?
DEAR LIST,
Has anyone ever tried using a “watt saver” fluorescent bulb in
their enlargers? The issues and considerations:
1) Why bother? To allow all the advantages of efficiency and less heat (no
negative popping etc) while using your condenser lenses…for those who like
condenser enlargers. Commercially available cold light heads are predominantly
diffusion sources.
2) All fluorescent bulbs are “hybrid” i.e., a blend of line spectrum and
continuous spectrum. Sure, but then again, so are all cold light heads!
3) Color? Watt savers are available in the usual cool white and also a
warmer color. I own both. Again, with hybrid spectra, one never knows what it
will be.
4) The color spectrum will be less of an issue with graded paper than with
VC/Multigrade paper.
5) Most watt savers are spiral tubes and may very well cause unevenness on
the paper plane. True, but I have some that are in the usual frosted envelope.
They are not as perfect as the “opal” frosting of enlarger bulbs. Yes, I know
that condenser lenses focus the light source into the entrance pupil of the
enlarging lens and the enlarging lens focuses the n!
egative onto the easel. But I wonder if the frosted bulbs will be even
enough. Hmmm.
This may all be fanciful speculation but then again, who know…
CHEERS!
BOB
PS: Just so you know, I swear by my cold light diffuse source. I am just
curious about the idea above.
Please check my website: http://www.bobkiss.com/
"Live as if you are going to die tomorrow. Learn as if you are going to live
forever". Mahatma Gandhi
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