Re: Filter/Speed/Meter

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

On  2 Oct 00 at 10:03, R. C. Lacovara wrote:

> Folks,
> 
> I see that you share exposure information by stating the filter which you 
> use (often an 89B) and then the film speed. That seems reasonable. But 
> sometimes it's not clear what you are using for a meter. I suppose that 
> light meters are similar in the visible, but do they not differ somewhat in 
> the IR?
> 
> In any event, could someone tell me, for either HIE or Maco, a 
> filter/speed/lightmeter combination?
> 
> I have tried a Hoya R72 over my Weston III and IV, but despite several 
> sources' claims that these meters are IR sensitive, this is hard to see. 
> I'm trying to rig a better filter mount for one of my Westons.

Be smart & brave, and forget about light meters altogether.
Since infrared film, and especially HIE, downright *demands* bright 
sunlight, you only need the Sunny-Sixteen-Rule, with 1/ASA seconds @ 
f16. 
With HIE & #87C this translates to 12 ASA, and a typical bracket of 
1/60s @ f5.6 - 8 - 11
With #25A red you have 50 ASA, and 1/250s @ f5.6 - 8 - 11.
#89B would be inbetween, 1/125s.

After a while you get a) a much better feel for the film, and more
importantly b) a much more consistent handling with different
camera's (switching from all-mechanical manual cameras to electronic
AF cameras).

All this becomes even more relevant if those SLR-cameras have been 
fitted with a BTFR (between the film rails) filter....that way the 
inboard light meter never sees the IR filter anyway (and it better doesn't 
either with an opaque #87C, as you couldn't see a thing through the 
viewfinder in the first place....;))




--                 
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'!]
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