It does seem to do pretty well with the RM90, despite the fact that the
filter is pretty extreme in terms of blocking visible light. I suspect that
some of the less aggressive IR filter would work better.
And sensor flare is a bit of an issue still - consider these two shots:
http://www.markcassino.com/temp/peso/IMGP2848.jpg
http://www.markcassino.com/temp/peso/IMGP2853.jpg
The latter was taken in the same place and position as a shot in the gallery
I originally posted, but was a 20 second shot at f16 vs the gallery shot,
which was 2 seconds at f5.6.
It seems that the long exposure shots at small apertures produced a lot of
sensor flare. Short exposure shots at small apertures do not produce sensor
flare, nor did short exposures at wide apertures.
I'm not sure how to interpret that - I think I'll try a long exposure shot
with an open aperture (i.e. -shooting in a fairly dark place) and see what
happens. I suspect that sensor flare when the IR filter is in place is
directly related to exposure time, and only exposure time. I don't know why,
but it may be an interesting clue re the nature or IR light, or the working
of the camera.
Or it might just be a silly waste of time...
- MCC
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Mark Cassino Photography
Kalamazoo, MI
www.markcassino.com
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----- Original Message -----
From: "William Robb" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, August 02, 2005 11:26 PM
Subject: Re: GESO - thie invisible world
----- Original Message -----
From: "Mark Cassino"
Subject: GESO - thie invisible world
About a year ago I tried some IR shots with the *ist-D and a Hoya RM90 IR
filter, without great success. This weekend I tried it again just
hanging out around the house, and was surprised to get much better
images.
It's nice to see that the istD will work with IR. The last tiem I tried IR
was with a Canon G1, which was terrific.
As a matter of fact, it was about the only thing I liked about that
camera.
William Robb
