Re: I guess I'll do it, too. - Reply

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

On 14 Dec 96 at 15:42, francisco sandoval wrote:

> It seems that I do not know anything about IR films, and you know it
> all, I do not want anybody to get mad with me because I ask to much
> about basic stuff...

Nobody gets mad at anyone, we are all here to learn (and nobody 
certainly knows it all!)
There is no minimum level required, although you might learn faster 
if you download the document "frequently asked questions about 
infrared" (IR-FAQ). You can find a link to this document on my 
homepage:

http://www.a1.nl/phomepag/markerink/mainpage.htm

(I assume you have a web-browser like Netscape to read these HTML 
pages?)


> I just have used the 25 red filter, what would I get with other filters
> (contrast, like in normal b/w)..... Francisco ;)

Contrast indeed increases if you use darker filters, but foliage also 
shows more white. The darker the filter, the less visible light is 
recorded, and the more real infrared (only relatively, since you *do* 
need to increase exposure 1 or 2 stops). 
The range of filters, from light to dark, is:

#21 orange
#25 red
#70 
#89B (visible limit in front of a lens)
#88 (visible limit with naked eye)
#87
#87C
#87B
#87A

--
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. 4