[rollei_list] Re: How is the Infrarot filter used?
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 16 Nov 2012 07:31:45 -0300
2012/11/17 Vick Ko <vick.ko@xxxxxxxxxxxx>:
> I got an Infrarot filter in a kit that I bought.
>
> How is this filter used?
>
> I searched the net briefly, and thought that is it easier to ask here.
Most of Rollei infrared filters have the advantage they needn't focus
shift compensation ( the red mark you see in several SLR cameras
focusing ring) because they are or were made with a special optical
construction to compensate themselves the focus shift and since a true
infrared filter is a "black" filter, the TLR has the advantage you can
focus as always. Taking as reference the opaque Hoya R72 IR filter
that allows to pass dark red and infrared above 720nm, the Rollei
Infra-red filter allows to pass dark red and infrared rays above
700nm, it would be a R70 filter, close to the Hoya and then you can
take your films exposures with this Hoya R72 as basis, f.e.Efke IR
820nm Aura rate at 1/1.5 ISO, Aperture f/16, 1 - 8 seconds exposure
(suggested in the Freestyle website, they sell some infrared films, I
also saw in B&H website infrared film like "Rollei/AGFA" for different
film formats ).
Carlos
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