Re: [photo-3d] Re: Medium Format Viewers (again!)

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

> > >For lighting he used an inexpensive battery operated florescent
> > >tube that he attached to the loupes with some plexiglass triangles.
> >
> > How does the colour look with those?  Flourescent lamps don't have a
> > full spectrum, as you probably know.
> >

> I think it looks OK.  I think you can get tubes of the correct color
> temperature for the little flourescent units.  By the way, besides
> color temperature you need to check a flourescent lamps CRI rating.
> This tells you how smooth the lamps spectrum is (and how closely it
> matches the Sun's continuous spectrum).  You want a CRI greater than
> 90.
>
> Your eyes will accept a wide range of color temperature as being
> "correct" once you are accommodated to it.  Besides that, you're not
> likely to be using a viewing light of the same color temperature as
> the main lighting where ever you're sitting, so you're eyes will need
> to adjust anyway.

>> Brian Reynolds                  | "Dee Dee!  Don't touch that button!"
> reynolds@xxxxxxxxx              | "Oooh!"
> http://www.panix.com/~reynolds  |    -- Dexter and Dee Dee
> NAR# 54438                      |       "Dexter's Laboratory"

There are fluorescent tubes available in both 5200 degrees Kelvin, and 6000
degrees Kelvin, that have been designed for matching type "B" incandescent
photo lamps, and daylight.   They are made by essentially coating the inside
of the tubes with a mixture of the red, green, and blue P-22 color
television phosphors.  As such, they are very different from conventional
fluorescents, and do NOT give the typical green cast in photographs.  Might
be ideal for a viewer source (as well as for sorting and examining slides on
a light box).

These have been available for several years, but the problem is that they
were only available in 2 ft. and 4 ft. lengths.  Recently, they have become
available in other sizes as well, and I saw a small tube (I think it was 6
inches) at a trade show last year.  I don't recall the brand name (it might
have been something like Cool-Lux), but maybe someone else on the list
knows.  If you have the time, you might want to try a search engine.

JR


 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/