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Old Apr 8, 2005, 6:41 PM   #1
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Infrared with a Minolta A1...
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Old Apr 8, 2005, 11:56 PM   #2
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OK, I'll bite. Is it really, or did you tweak a B/W pic to get the effect? Or, is is a solarized color image converted to monochrome?

From what I have read, the K-M cameras after the d7 don't do IR due to the strong internal IR blocking filter. If there is a way around this, I would be interested.

brian
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Old Apr 9, 2005, 1:54 AM   #3
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I did it after the fact...I found the how-to article here:
http://www.popphoto.com/article.asp?...rticle_id=1174

I just was curious as to how close it seemed to others?
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Old Apr 10, 2005, 6:02 AM   #4
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It's true the IR is mostly blocked just like on most other cameras (except the original Minolta D7); However what this means is the camera is less sensitive in the IR region but IR pictures can still be taken by increasing the exposure time - this works best with static object...

Same with the Canon 10D/Rebel - If the time for exposure is long enough, the camera can 'see' IR (ie the filter does not have a sharp cut-off and some IR will bleed through)


FYI - http://www.wrotniak.net/photo/infrared/
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First, you need a digital camera. As far as I know, all of these have a special infrared-blocking filter in front of the light-sensitive CCD array, as the IR light degrades the visible-light image quality (and the CCD itself reacts to wavelengths up to 1000 nanometers and even longer). The question is how much of infrared will the filter let through.
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Old Apr 10, 2005, 10:58 PM   #5
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I was pretty impressed with what the technique could do in just 10 minutes of fiddeling with it. I'll probably try several other "plant/scenic specific" shots over the next few weeks to see how close I can actually get.
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Old Apr 17, 2005, 8:03 PM   #6
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It took me a while to think of trying this after I made the remark in my original reply, but tell me what you think of this.

I used the solarization setting, then adjusted the hue to +150 (PI) and reduced the saturation some what. This is a crop of the original.

brian
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Old Apr 20, 2005, 9:57 PM   #7
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Interesting but it looks more like a negative to me..

Here are some psuedo IRs I did a while back..

http://photobucket.com/albums/v285/jjmel/Psuedo%20IR/

My posts in this thread show how they were done..

http://www.stevesforums.com/forums/v...85&forum_id=23

Here are some taken with a Panasonic FZ20 with a Hoya R72

http://photobucket.com/albums/v285/j...20%20InfraRed/

and finally, with my older Fuji using a Rolleiflex IR filter..

http://photobucket.com/albums/v285/j...00%20InfraRed/

None of them will win any contests but they are fun to play with..

Jeff
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Old Jan 5, 2006, 12:36 AM   #8
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If you're gutsy enough, you can crack open your camera and replace the internal hot mirror with a bit of optical glass that'll pass IR light. I did this operation on an old Kodak DX3500 a while back, and the results are quite nice. I maybe lose one or two (at most) stops with a Hoya R72 IR filter.



--Chris


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Old Jan 5, 2006, 8:42 AM   #9
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I suppose I don't have the gutz for it.....lol
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