On 14 Jan 2004 at 0:38, Willem-Jan Markerink wrote:
> On 13 Jan 2004 at 16:45, Randy Roy wrote:
>
> > There is an article in the Feb. issue of Outdoor Photographer about
> > a guy that will convert a D30 or D60 so it can be used for IR
> > photography (cost $350). He removes the IR cut-off filter and
> > installs a permanent 87B IR filter in the camera. The only kicker
> > is that it is now an "IR only" camera.
> >
> > My thinking is that maybe you could have him remove the cut-off
> > filter only, and you use your own screw-on IR filter(s) on your
> > lens(es).
> >
> > There is a web site, but I don't know if posting URL's is allowed
> > here.
>
> Sure it is, don't tease us like that....;))
>
> Btw, mounting quasi-permanent filters inside the camera, behind the
> mirror, is quite common for analog IR-photographers; up to 0.5mm thick
> filters fit nicely between the film rails (allowing a sturdy yet
> flexible quality of filter)....:))
>
> http://www.a1.nl/phomepag/markerink/btfr_fil.htm
Btw, after seeing the typical shutterspeeds of the two sample images
(different filter (#87/b&w vs #89B/color), same exposure index), I
realised that such a filter *inside* the camera is only half as
relevant for a digicam compared to an analog camera....with 2s
shutterspeed, you need a tripod anyway....and given a tripod, it's
less problematic to use opaque filters in front of the camera (in
particular sliding filters a la Cokin).
Also: it seems those older dedicated-IR camera's (like DCS3ir) at
least had the benefit of a sufficient exposure index (400-1600 ASA
IIRC)....otherwise they could never been used for aerial photography.
Therefore: the claim that *current* digicam's make IR-film redundant
is rubbish....they once did, but do not any longer....;))
(couldn't use a digicam on skiing trips (no tripod) either)
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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