"and now the EU is banning incandescent bulbs" - a slight exaggeration - but
it sure gets up my nose anyway :-(
Jez, partially heating his house with 'waste' heat from light bulbs.
On Mon, Oct 26, 2009 at 1:20 PM, Carlos J. Santisteban <zuiko21@xxxxxxxxx>wrote:
> Hi C.H., Moose, Ken, Fernando and all,
>
> From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
> >Really? But most if not all the professional light boxes are using
> >fluorescent lamps. More interesting is I just found there are many
> >fluorescent studio lighting system on the market.
>
> However, one thing is lighting a studio scene, and another is to put light
> of a suitable spectrum thru the dyes of a slide... metamerism _is_ an issue
> with the latter. Again, the demise of slides in the pro market makes
> "accurate" light tables much less needed.
>
> From: Moose <olymoose@xxxxxxxxx>
> >Like Ali with high end DSLR low light capability, I suspect Carlos isn't
> >up to date on lighting developments.
>
> Most likely. However, I can speak only for what I can purchase over here...
> See my comment to C.H.'s post.
>
> I have to admit that I'm biased against fluorescent lighting, especially
> CFLs -- and now the EU is banning incandescent bulbs! Everything started
> early this summer, when my first Provia-400X scans came out with an _awful_
> red/magenta cast:
> <http://cjss.sytes.net/post/scan/provia400x/Untitled-8.jpg> (as came out
> from the scanner, just scaled down)
>
> The slide doesn't look like that... but when seen thru CFL light (my bulb
> is
> IKEA brand, definitely not State of the Art) it does! Maybe my CanoScan
> 9950F is dying... but metamerism is a real concern, at least with some
> emulsions. The very same scanner does much better with Astia-100F:
> <http://cjss.sytes.net/post/scan/astia100f/velefique.jpg> which does with
> a
> much more reasonable correction.
>
> And... my new Panny GF-1 does a very fine work at AWB, much better than the
> 300D. But the only lightsource which deceives it is the CFL -- fortunately,
> it's very easy to use the manual WB option ;^)
>
> From: Ken Norton <ken@xxxxxxxxxxx>
> >Every television studio I've been in in the last dozen years has been
> nearly
> >100% florescent for primary lighting.
>
> Ditto. Actors don't look at slides :-)
>
> From: Andrew Fildes <afildes@xxxxxxxxxxxxx>
> >>100% florescent for primary lighting.
> >
> >...or perhaps the flowers? ;-)
>
> LOL!
>
> And then from another thread...
>
> From: Moose <olymoose@xxxxxxxxx>
> Subject: Re: [OM] 80/4.0 Macro resolving power?
> >Fernando Gonzalez Gentile wrote:
> >> Mmm !!
> >> Was the 5D color balance set to fluorescent, daylight, auto .... ?
> >>
> >
> >The light source is supposed to be daylight WB, so that's where I set
> >the camera.
>
> So you were "copying" the slides with the rig pointed to natural sunlight,
> weren't you?
>
> >The question you haven't asked is what color is the slide really?
> >Projected, it's one color, viewed against a light window another, viewed
> >on the light table, yet another.
>
> A very, very, very good point! Slides are intended to be seen thru a
> black-body illuminant of 5000ºK -- the exact temperature is not critical as
> long as it has a continuous spectrum of the black-body class, the human eye
> is surprisingly good at this.
>
> So, the most accurate way to illuminate the slides is direct sunlight,
> reflected/diffused on a neutral surface. If you're pointing at the blue
> sky,
> the balance may be way off.
>
> Unless you're comparing with a monitor, second best is projected: the
> halogen bulb is warmer (circa 3200ºK) but being black-body the eye
> compensates easily for this.
>
> I have tried to use my monitor (LG 1910S, IPS type panel set @ 6500ºK) as
> light source and, while better than my CFL, it's still very poor. OTOH, a
> "white" LED flashlight is surprisingly good at this, at least compared with
> the fluorescents.
>
> Cheers,
>
> --
> Carlos J. Santisteban Salinas
> IES Turaniana (Roquetas de Mar, Almeria)
> <http://cjss.sytes.net/>
> --
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>
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