Here's a sample of a shot straight from the camera, with no adjustment:
http://www.markcassino.com/temp/IMGP0574a.jpg
The same shot, desaturated, with a few quick tweaks to the levels and curves (there is a lot more potential, I just did some quick, basic adjustments sitting here):
http://www.markcassino.com/temp/IMGP0574.jpg
That was in light overcast sun. To give you an idea of the exposure factor that was taken at ISO 3200, 1/4th second, f8. Shots without the filter taken at the same time were metering at 1/180 - f16 (close to the sunny 16 rule that you'd expect in near full sun at midday.) So that's a .... 9 stop lose if I have counted my fingers right.
But, the RM90 is a pretty aggressive filter for this use, and leave almost no visible light.
I did experience some odd effects while shooting with this setup, which I now think are "sensor flare" (I had not heard about it at the time I shot the IR shots.) Here's an example:
http://www.markcassino.com/temp/IMGP0582.jpg
FWIW - I shot these in the alvar grassland in Drummond Island, Michigan. Alvars are areas where the bedrock goes right up to the surface of the earth, so there are a few inches of soil and no water drainage. The result is extremes of moisture and dryness. I hoped the IR (both digital and film) would make the plants pop from the rocky soil, but neither the digital shots nor the shots with HEI worked out as intended.
- MCC
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Mark Cassino Photography
Kalamazoo, MI
www.markcassino.com
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----- Original Message ----- From: "Derby Chang" <[EMAIL PROTECTED]>
To: "Pentax Discuss" <pentax-discuss@pdml.net>
Sent: Friday, April 15, 2005 8:10 PM
Subject: IR with *istDS
Has anyone tried IR with the istDS?
http://infrareddreams.com/how_to_shoot_ir.htm
I took a quick pic with a remote control, and saw the IR light. Might go out an buy an 88A filter.
D
-- [EMAIL PROTECTED] http://homepages.ihug.com.au/~derbyc
