Horizon 202 filters (was: Infrared-Digest V #172

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

On  1 May 99 at 11:45, TTShooter@xxxxxxx wrote:

> 
> In a message dated 4/30/99 1:26:11 PM, owner-infrared-digest@xxxxx writes:
> 
> << w.j.markerink@xxxxx >>
> 
> I have a Horizon 202 and would like to try it with IR, how did you make the 
> filters? I have used most IR films/dev combos and keep coming back to Kodak 
> IR, #25 filter and D-76, though I really enjoy the conversation at this list. 

The #87C is made from the same 0.4mm thick polyester as the BTFR 
filters....sturdy and scratch-resistant enough to sit in the filter 
holder on its own.
Note that I can make other colors as well, all hard resin, from my 
202-filter-info-file: 

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Filter colors available for Horizon 202:

'#' = Kodak Wratten filter system

  #21 orange

  #25 red

  #87C infrared [opaque, for Kodak HIE black & white infrared only]

  polaroid [requires adjusting outside camera]

  #85C color conversion

  #81B warming

  #81C warming

  CC30M (fluorescent tube correction)


Working on other colors, like 

  #89B dark red 

  enhancement/color-intensifier 

  color-polarisation (a la Cokin/Hoya vario-color pol)

  #12 medium-yellow [for Kodak EIR color infrared]
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Also note that work-around solutions are possible for any other 
color, simply by sandwiching a thin piece of foil over a factory clear/UV 
disc....not the best solution in optics/scratch-resistance, but a #12 
has been working that way for me as a temporarily solution (still 
looking for a hard resin solution though).

As for making them: cutting the filters in this size was one of the 
major challenges when I started all this....with different solutions 
& procedures for different materials....still labor-intensive and a 
significant amount of wasted/broken material, that's why they are not 
cheap (US$15 for filter disc only; modifying the filter holder to 
make the discs user-changeable is the same price, for the same reason 
(labor)).

PS: next time please change the subject-header....IR-digest xxxx is 
not very descriptive....8-))


--                 
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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