RE: Filter question.

["Vrueh, G.J. de" <G.J.de.Vrueh@xxxxxxxxxxx>]

Hello clive,

I have found it and it is very clear that my B+W filter matches a wratten 29
filter. It is slightly "darker" filter but it is useble with al the films i
want to test. There are darker filters but those are probaly not much usfull
with films as ilford SFX.

I have printed the whole version out and will read it in the quiet ours.

Thanks
Gerard


-----Oorspronkelijk bericht-----
Van: Clive Warren [mailto:Clive.Warren@xxxxxxxxxxxxxx]
Verzonden: woensdag 9 augustus 2000 11:37
Aan: infrared@xxxxx
Onderwerp: Re: Filter question.


At 11:00 am +0200 9/8/00, Vrueh, G.J. de wrote:
>
>Hello out there,
>
>I am starting out in IR-photografie. I have done some (louzy ending)
>experiments but want to make a serious step now.
>
>I do have a red filter and would like to know weather i can expect good
>IR-effect with it or that i have to buy another filter. The filter is a:
B+W
>8x red Nr 091.
>I want to try this with kodak HIE and ilford SFX and maybe in the future
>with MACO and or Konica
>do i need differend filters for them or is the a good filter for all of
>these films. I ask this because not all of these films have the same
>sensibility to IR.
>
>I have read a lot about exposure and realise there are differen opinions
>about it. i dont understand weater i have to meter trough the lens withe
the
>filter in place ore that i have to meter without the filter. Some people
say
>that the use 1600 iso whili other say there film is only 50.
>
>I am a little of track i'm afraid. Who can make it a little clearer for me
>how to messure the light. (i have a hand held meter as well as ttl.)
>
>thanks in advance for all the help.
>Greetings from the Netherlands,
>Gerard de Vrueh


Hello Gerard,

The answers to all of your questions are in the Infrared FAQ, and 
hopefully written in a way that is easy to read :-)  The Infrared FAQ 
is located on the CoCam website.

                  http://www.cocam.co.uk


You will have an increased "IR-effect" if you use an opaque infrared 
filter such as the #89B, #88A, or #87 Wratten rated filters with 
Kodak HIE.  Ilford SFX is an extended red sensitive film and is best 
used with a #25 red filter. True infrared filters will result in very 
long exposure times and very high contrast - if you get anything at 
all on the film :-)

-- 
All the best,

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