[rollei_list] Re: How is the Infrarot filter used?
- From: Uwe Wolfgang Steinke <paintingwithlenses@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 16 Nov 2012 15:54:02 +0100
Hi,
just saw this on the bay;)
No. *221154030613*
3,5 hours left - if anybody needs one - go get it;)
Uwe
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2012/11/16 John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>
> Vick,
>
> You use it with infra red film.
>
> It is virtually opaque to the human eye because the range of light that it
> passes is out of the range of human sensitivity.
>
> Infra red film is not easily obtainable now but some is sold under the
> Rollei banner. It is quoted as having two ISO ratings, in this case 400 and
> 25 - 400 is without the filter when it has greater sensitivity to reds and
> 25 is with the filter. The recommendation is that you take one photo with
> and one without the filter to make sure that you capture an image.
>
> With a TLR, it is not a problem viewing the scene because the 'black'
> filter
> is on the taking lens. I used the film in my SL66 and it meant placing and
> removing the filter when taking or viewing. There is a focus shift for
> light
> in this range, some lenses have a red mark which becomes the focus
> reference
> mark but I do not think any of the Rolleis have one. A stopped down lens
> should be sufficient for the majority of distances but it is worth reading
> up on it.
>
> I used a couple of rolls a few weeks ago. The ISO 400 is good; the ISO 25
> with filter is optimistic. One or two stops more exposure would not go
> amiss. I found that it important to determine the amount of red, green and
> blue in a scene and would recommend looking through a deep red filter
> first.
> That way you can determine what is likely to be recorded as dark (blues)
> and
> light (reds and greens). Studying other's IR photos would be useful too.
>
> John
>
>
> On 17/11/2012 04:50, "Vick Ko" <vick.ko@xxxxxxxxxxxx> wrote:
>
> > 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.
> >
> > thanks
> > Vick
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--
Uwe Wolfgang Steinke
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