Quotes
“Hot spots and focusing are the two challenging problems in IR digital photography. Without returning to the issue of focusing, let us just remind ourselves that a camera will be optimized for one or two lenses, others will suffer from some degree of front- or back-focus and/or from hot spots. Note that also those lenses — like the ones in Canon’s L series — that do have a red sign on the barrel for focus correction in the IR range do so for some specific wavelength: in the case of Canon around 800nm. This choice is obviously not an accident: most commercial IR films tend to be sensitive around this wavelength and lose their sensitivity shortly afterwards.” Annaratone, Marco, and Claudio Ruscello. "Infrared Photography Part II." Infrared Photography. July 2010. Web. 28 Sep 2011. <http://www.infraredphoto.eu/Site/GentleIntro2.html>.
“A blue sky will appear black, or very dark, while foliage will get a distinct white color. This creates amazing contrast in the image that makes the photo ‘pop’. Due to the long exposure time, portraits and other non-static sceneries can be hard to capture, this is one of the reasons why most IR photographs are landscape shots.
First of all you need to have a D-SLR camera with a lens that can use filters. Then you need to purchase an IR-filter, there are a few out there and the main difference (assuming we’re looking at the same brand) is the range of wavelengths that the filter lets through.
The IR filter I use is the Hoya R72, all the IR photographs in this article are taken using that filter. I’m very happy with this filter, but since it’s the only one I’ve tried I can’t recommend it above any other one.” Silverglimth, Fredrik. "Getting Started with Infrared Photography." Tutorial 9. 05 June 2008. Web. 28 Sep 2011. <http://www.tutorial9.net/tutorials/photography-tutorials/infrared-photography/>.
“A blue sky will appear black, or very dark, while foliage will get a distinct white color. This creates amazing contrast in the image that makes the photo ‘pop’. Due to the long exposure time, portraits and other non-static sceneries can be hard to capture, this is one of the reasons why most IR photographs are landscape shots.
First of all you need to have a D-SLR camera with a lens that can use filters. Then you need to purchase an IR-filter, there are a few out there and the main difference (assuming we’re looking at the same brand) is the range of wavelengths that the filter lets through.
The IR filter I use is the Hoya R72, all the IR photographs in this article are taken using that filter. I’m very happy with this filter, but since it’s the only one I’ve tried I can’t recommend it above any other one.” Silverglimth, Fredrik. "Getting Started with Infrared Photography." Tutorial 9. 05 June 2008. Web. 28 Sep 2011. <http://www.tutorial9.net/tutorials/photography-tutorials/infrared-photography/>.
Bibliography
Annaratone, Marco, and Claudio Ruscello. "Infrared Photography Part II." Infrared Photography. July 2010. Web. 28 Sep 2011. <http://www.infraredphoto.eu/Site/GentleIntro2.html>.
Annaratone and Ruscello explore the issues with hotspots and focusing in IR digital photography. They do an in-depth of analysis between several different lenses, including both Canon and Nikon brands. They used a Nikon lens on their Canon Rebel XT via a Nikon-to-Canon mount adapter. Canon 16-35mm f/2.8 and 70-200mm f/2.8 lenses should be avoided because of hotspots. The authors, however, claimed that these hotspots do not happen every time, so it may be possible to still use these lenses. Through a series of sample photographs, they show how important IR compensation can be, especially with the focus of a lens. The article explains that autofocus should be used with caution, because “it may not be able to deliver an ultra-sharp image, but it seems to deliver the best possible focusing”. In conclusion, Annaratone and Ruscello decide “we should not forget that the lenses we use are conventional lenses with some degree of correction that make them usable in the near IR range. These are not specialized tools for IR imaging. That means that, in spite of all our effort for achieving precise focusing, avoiding hot spots, etc some residual aberrations may still be there and create some ‘haze’ effect”.
Annaratone and Ruscello explore the issues with hotspots and focusing in IR digital photography. They do an in-depth of analysis between several different lenses, including both Canon and Nikon brands. They used a Nikon lens on their Canon Rebel XT via a Nikon-to-Canon mount adapter. Canon 16-35mm f/2.8 and 70-200mm f/2.8 lenses should be avoided because of hotspots. The authors, however, claimed that these hotspots do not happen every time, so it may be possible to still use these lenses. Through a series of sample photographs, they show how important IR compensation can be, especially with the focus of a lens. The article explains that autofocus should be used with caution, because “it may not be able to deliver an ultra-sharp image, but it seems to deliver the best possible focusing”. In conclusion, Annaratone and Ruscello decide “we should not forget that the lenses we use are conventional lenses with some degree of correction that make them usable in the near IR range. These are not specialized tools for IR imaging. That means that, in spite of all our effort for achieving precise focusing, avoiding hot spots, etc some residual aberrations may still be there and create some ‘haze’ effect”.
Summary
I’m still not sure if I would like to use infrared photography in my work. I think that I would experiment with a DSLR, just because the film is so expensive and finicky. I also would need to look into developing infrared film, because I’m not sure if I have the chemicals or possibility to do it myself. In regards to the articles I read, I had no idea that certain lenses won’t work because they create hot spots. I also didn’t know that you could use a Nikon lens on a Canon body. The use of infrared photography is definitely a possibility in my work – it could do some really interesting things with my landscapes. At the same time, though, it could present itself as a mere novelty and lessen my photographs.
Video
http://www.youtube.com/watch?v=p8RSHClT0SY
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