Re: Exposure and development control

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 23 Oct 96 at 14:10, Bobbie Doyle wrote:

> On Wed, 23 Oct 1996, Willem-Jan Markerink wrote:
> 
> > Yet the latter is countered in case of snow, snow reflects the full 
> > spectrum....
> 
> Is this referring to snow in sunlight? 

Not specifically, but on overcast days there is little IR that 
reaches the snow in the first place....;-))

Btw, it just occurred to me that snow behaves completely different 
than water....water absorbs IR....that's why it appears black.

Mmm....what was that special thing with ice....refractive index? 
transmission? Any ice experts out here? 
(no, not the food type of ice....that would make me expert too....;-)) 

Ah, now I remember: total absorption, close to 100%, better than 
water. 
That rules clear ice out as a shiny subject on film....8-))
But it can make a nice black background, providing that the ice is clear 
and free of snow....

Mmm....or a combination of clear ice and snow covered parts....
Yet more experiments for this winter....;-))


--
Bye,

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      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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Topic No. 19