jaapv Posted February 26, 2011 Share #1 Posted February 26, 2011 Advertisement (gone after registration) In a moment of mental aberration I bought a B&W 099 filter (orange IR) Does anybody know a use for it? Link to post Share on other sites More sharing options...
Advertisement Posted February 26, 2011 Posted February 26, 2011 Hi jaapv, Take a look here Unknown filter.. I'm sure you'll find what you were looking for!
luigi bertolotti Posted February 26, 2011 Share #2 Posted February 26, 2011 For what it can help... B+W 099 Filters This orange colored camera filter blocks the blue and blue-green portion of the visible spectrum up to approximately 520nm. It reduces the excessive sensitivity of color infrared films for this spectral range, helps avoid blue tint and differentiates colors more evenly. Filter factor depends on film sensitivity. Link to post Share on other sites More sharing options...
jaapv Posted February 26, 2011 Author Share #3 Posted February 26, 2011 I'l screw it onto the M8 and as soon as we have some sun, which should be within the next three months I see what it does.... I hope that it will act as an extreme yellow filter for B&W. Link to post Share on other sites More sharing options...
luigi bertolotti Posted February 26, 2011 Share #4 Posted February 26, 2011 Does its coloring look different from a "normal" orange filter for bw ? Years and years ago , when I shot much bw films, I used them not rarely... indeed, an extreme yellow without the excesses of the red filters (skies in pure black). Anyway, about "mental aberration"... I can understand that a pure-blooded Dutch can't resist to a fine orange item... Link to post Share on other sites More sharing options...
jaapv Posted February 26, 2011 Author Share #5 Posted February 26, 2011 No, it looks orange. Yup- some of my countryman go bonkers over the color... Btw, I didn't see another thread with exactly the same title until after I started this one. Quite a coincidence! Link to post Share on other sites More sharing options...
luigi bertolotti Posted February 26, 2011 Share #6 Posted February 26, 2011 Seems it has "aficionados"... Flickr: Infrared B+W #099 (Orange) Filter : some nice pic, indeed. Ken Rockwell isn't one of them : "...probably an orange filter already in your bag for B/W is as good" Link to post Share on other sites More sharing options...
tdtaylor Posted February 27, 2011 Share #7 Posted February 27, 2011 Advertisement (gone after registration) Getting hooked up with an unknown filter- who knows where this could lead ...... Link to post Share on other sites More sharing options...
Michael Geschlecht Posted February 27, 2011 Share #8 Posted February 27, 2011 Hello Jaap, Orange filters were used to subtract the blue wave legnths to which false color infrared film was sensitive. That appropriately sensitized layer would then be available for recording the image created by the infrared light present which would not be effected by the orange color. The resulting false color image - processed in E-3 - would produce an image of sometimes unnatural seeming colors one of which was the now visually discernable infrared. I think it was called Aero Ektachrome. I used this film in the summer of 1970 to locate a Native American village underground which was not discernable w/ visible light on an island where the Potomac River cuts thru the Catoctin Mountains @ Point of Rocks Maryland which is not too far from Harper's Ferry Virginia made famous by the early abolitionist John Brown. I got the idea to do this from reading various publications from NASA available to me since I was originally a physics major & had friends who were in the physics department where I went to undergraduate school. They were the team who put the gravimeter on the moon in 1969. I liked reading their NASA publications including the ones dealing w/ photography. Some of the NASA material relating to aerial infrared dealt w/ analyzing materials on the surface of the earth which might have a different infrared than visual reflectivity. I realized that it might be possible to find entire sites completely buried underground if the content of the material on the surface contained buried material different from the surrounding soil. I came to this conclusion after reading some work by James Deetz where he had farmers plough balls painted specific various colors back & forth for the equivalent of 100 years of ploughing & then had students record their lateral movement. The balls moved up & down significantly but not much side to side. I was able to photograph the prospective site from a wing over Piper Cub or perhaps it was a Cessna altho I'm pretty sure it was a Piper. Of the two rolls of film I took one image of the site buried beneath the ground was as clear as if it were on top. This made mapping & subsequent excavation easy since we knew where everything visually hidden from us was located because of its infrared image. This work by James Deetz is an early form of empirical archaeology later known as "New Archaeology" where archaeologists try to validate their theories of what life might have been like years ago w/ reproducable scientific arguments. A common practice worldwide today. My location of undergroud sites invisible to the naked eye w/ the use of aerial infrared film would later be categorized as a variety of remote sensing. Best Regards, Michael BTW: Since I was an undergraduate student on a limited budget (archaeology is one of the fields where you can begin working as an undergraduate) & was not able to afford the filter we are discussing I used a #1 yellow stacked w/ an 85 for Kodachrome type A. Worked reasonably well. Link to post Share on other sites More sharing options...
ho_co Posted February 27, 2011 Share #9 Posted February 27, 2011 Wow, Michael! What a great story. Link to post Share on other sites More sharing options...
01af Posted February 27, 2011 Share #10 Posted February 27, 2011 I bought a B&W 099 filter (orange IR) Does anybody know a use for it? B+W 099 (Wratten #16) is a simple edge filter, i. e. it blocks short wavelengths and transmisses the long, with a fairly steep transition between the blocking and the transparent ranges (hence 'edge'). It almost entirely blocks UV, violet, and blue, and also a bit of green. It can be used as a regular contrast-enhancement filter on black-and-white film; the effect is stronger than dark yellow (#15, Y-52) but weaker than deep orange (#22, O-56). The position of the absorption edge is attuned to give visually pleasing results with Kodak Ektachrome Professional Infrared EIR film—but that film can also be used with deep yellow (#12), dark yellow (#15), or deep orange (#22) edge filters for nice results. For digital photography the B+W 099 filter is not very useful I'm afraid ... Link to post Share on other sites More sharing options...
jaapv Posted February 27, 2011 Author Share #11 Posted February 27, 2011 So I'll just have to source some EIR film, I guess And find a lab that can process it... Link to post Share on other sites More sharing options...
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