Re: rodinal developer for infrared

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

On 13 Sep 96 at 4:21, Robert Long wrote:

> Willem uses the unequivocal term "TTF" to specify when the meter
> reading is taken through the filter (and, normally, through the lens
> of a SLR).  

You will most likely be aware of this, but keep in mind that the 
(infra-)red sensitivity of most SLR's is a magnitude worse than that 
of handheld meters. And even worse: SLR's themselves show pretty 
severe variations, although with normal red it stays within a +/- 1 
stop variation. IR shows more variation, due to IR-block filters; the 
moderner the camera, the more 'block', requiring higher EI settings 
to get the same TTF reading.
So if you mention TTF, you must state whether it was taken with a
camera or with a handheld meter. And in case of a camera, also
*which* camera.


> Since this is a subject on which many of us are easily
> confused, may I suggest that we all adopt that term whenever it's
> appropriate?  Perhaps unfiltered metering--as with an independent,
> hand-held meter--should then be referred to as "bare."

Yep, sounds fine to me!
Only a pity it doesn't have a nice abbreviation....;-)) 

--
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. 21