[pure-silver] Re: ANYONE TRY THIS SILLY IDEA using CLF light bulbs?
- From: "mail1" <mail1@xxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 27 May 2011 09:40:13 -0700
I made an effort to use a daylight CLF bulb. Upon testing the Ilford filter
set that is design for an incandescent bulb I found the CLF bulbs spectrum
was incorrect for correct filter responds. I attempted to correct this with
minus blue color compensation filters. I finally abandoned the project
because the paper grade chart looked terrible, the plots were very uneven.
The CLF was left on in focus mode to keep it warm and turned off just before
placing paper and exposure.
It was obvious that Ilford VC-4 paper was designed for an incandescent
light source. I have successfully used cold lights designed for photo
graphic paper.
Most of the VC cold lights I have used required some adjustment in exposure
when changing paper grade settings. The Aristo VC4500 required the least
exposure correction. To reach grades above 3 I needed to reduce the out put
of the green tube with the auxiliary rheostat.
The low intensity of the VC4500 required longer exposures than my 500 watt
Durst incandescent condenser enlarger or Zone VI first generation VC cold
light.
Jonathan Ayers [mail1@xxxxxxxxxxxxxxxxx]
_____
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of BOB KISS
Sent: Wednesday, May 25, 2011 10:57 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] 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 negative 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/> 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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