RE: Filters for EIR

[Clive Warren <Clive.Warren@xxxxxxxxxxxxxx>]

At 7:29 pm -0400 13/6/00, Rolland Elliott wrote:

>Exact Filter colors vary from manufacturers. B+W's Yellow #12 looks like
>Tiffen's Yellow #8, both give good results in my opinion. I find orange
>filters to be a little bit too strong, but others think they are better than
>the yellows. So you should probably try them both and decide for yourself. I
>set my ISO to 250 and just meter through the filter and bracket -1/2 on each
>frame.
>
>Peace Rolland
>
>>>>>I just received some Kodak EIR film (thank you, Rolland, for such quick
>service), and I had a question about which filter to use. The only yellow
>filter I have is a Hoya yellow K2, which I understand isn't deep enough for
>EIR. I also have a Hoya orange (G). Neither of the filters have numbers on
>them, so I'm assuming the yellow is a #8, and the orange is either a #16 or
>#21.  Would this one be okay to use, until I can get a deeper yellow? And
>what ISO should I set for starters (TTL metering with filter in place)?


Filters from some manufacturers may not be marked with a Wratten equivalent
number as perhaps they vary depending on manufacturing factors.  It seems
likely that Hoya and B&W are manufactured within certain tolerances - their
web sites may give Wratten equivalents information.

It is certainly more costly to produce filters which are consistent and
within Wratten specifications.

Kodak recommend a starting point using a Wratten 12 filter which is an
orange and an ASA index of 200 for development in E6. From comments given
by various EIR users on the list they do not make much of a correction for
the filter. Bracketing is always a good idea.


All CoCam visible light filters are marked with a Wratten number and are
manufactured to strict tolerances.  We recommend the Wratten 12
specification filter for EIR.


You may have seen the recent posting about the new section in the Infrared
FAQ (URL in sig. file) contributed by Michel Wurtz showing the effects of
various filters on EIR.  This should give you a good idea of what to expect
if you want to experiment a little.


All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ


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