Re: EIR EI.

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

On  3 Dec 97 at 9:16, Alan_Arthur_AT_D3Mail%D3Mail@ wrote:

> 
> 
>      Hi Folks,
> 
>      After running 3 rolls of EIR through in the last month or so, I have
>      come to the conclusion that I have no idea of the best EI. I tried one
>      roll on EI250 and the other two on a mix of 250,320 and 400. It seems
>      that even 1/3 to 1/2 of a stop in overexposure causes a complete loss
>      of colour saturation, especially in the sky.
> 
>      The only thing that I can think of is that maybe (slight lack of
>      general knowledge on atmospheric spectral data here), in my part of
>      the world, the background IR is greater than in Rochester. Can the
>      ambient light be low, but ambient IR be high ?
> 
>      I usually end up getting about 1/2 the roll being decent shots with
>      good saturated colours, the others are just magenta/pink and white.

Can you remember at what time of the day you took your pictures?
Early in the morning and late in the afternoon there is *relatively* 
more IR....even though your light meter might say there is *less* 
light overall. That means overexposure, compared to correct exposure 
at noon (or underexposure at noon and correct exposure in the morning 
and late afternoon). 


- -- 
Bye,

Willem-Jan Markerink


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


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************

------------------------------

End of Infrared-Digest V0 #315
******************************