pretty cool shots IMHO! I can't wait to go out with the tripod and do this at ISO 200. Have you done so in your shot #4328?
The IR effect is pretty neat - really unpredictable too. I shot all of those at ISO 400. Exposure times ranged from 20 seconds at f 11 or 16 to just 1 or 2 seconds at the same aperture.
It looks like the cloud is blurred from motion...very nice!
Yes - they were clipping across the sky at a pretty good pace - 15 to 20 seconds is more than long enough to show blur. On the minus side I also got a lot of blur in foliage in other shots as well.
I'm rather amazed about this digital infrared. In "the olden days" you had to use a special film, now you only need a filter. And also the instant feedback is a great plus here - exposures on Kodak b/w infrared often were difficult, because proper ISO-rating was weather dependant, so to say.
I've played around with Kodak's High Speed Infared a few times - the exposures were really difficult to get right. Using the filter I can see why - places that meter about the same in the visible spectrum can be totally different with the IR filter on.
Another thought: Would it be possible to do color infrareds too, if we use lets say an orange filter and then shift the whole color balance in HVS mode? Or is the ratio of sensitivity between visible light and infrared on the chip so 'bad' that a single exposure wouldn't work?
I'm not sure that a filter would affect IR (other than the varieties of IR filters) - I played around with the white balance settings a bit, but that seemed to just tweak the shade of lavender that the image came out in. there does not seem to be much color other than the uniform reddish-lavender.
How about multiple exposures then, with and without filter...? Hmmm.... Must be some way to work it out, at least it's a large field to experiment in :-)
I had not thought about doing a multiple exposure using one IR shot and one regular (or filtered) shot - interesting idea!
What amazes me is that the camera still meters with the filter on it (the RM 90 is virtually black) - though not so accurately. It also can autofocus through the filter, though it's painfully slow.
- MCC -----
Mark Cassino Photography
Kalamazoo, MI
http://www.markcassino.com
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