Flip HD + Hoya R72 filter = near infrared camera

The visible spectrum is light with wavelengths between 400-700nm. An R72 filter blocks all light with wavelengths less then 720nm. Most images sensors in digital cameras are sensitive to light past 700nm in order to make a digital image look like what you see with your eye camera manufactures place a little piece of glass in the camera that blocks most of this light. Cheaper camera, however, do block as well. By placing an R72 filter over a Flip video camera we are able to see only light above 720nm that the camera is picking up. Vegetation reflects very well at these wavelengths while the sky and pavement do not giving cool effects such as a black sky or snow white trees. And the best part is you only need the smallest filter to cover the Flip camera lens! I bought mine for around $30

[JoelMannerino]

@bombaykaizoku been doing some of my own research but appearently i need fascinated by all of this ....raywilliamwalters got some good stuff counting the subject matter lol...

[bombaykaizoku]

@JoelMannerino1 No. Dark sunglasses are a type of neutral density filter and should evenly block wavelengths close to and in the visible spectrum. This filter is special in that it blocks all EXCEPT near IR wavelengths.

[bombaykaizoku]

@JoelMannerino1 No. Your asking for a filter to unblock light. Unless you alter the surface coating that is blocking the light you can not negate its effect.

[bombaykaizoku]

The two filters fight each other. The one in the camera blocks IR and the one I use lets IR through. The only reason I get a decent image here is because the camera is cheep enough not have the IR blocker in it.

[JoelMannerino]

Test this same thing exactly and wear dark sunglasses. They should appear as if they have clear lenses correct?

[JoelMannerino]

Now i a also have anotger the camera is already sensitive to infrared light such as a tv remote, and the camera has an infrared filter built in it, is there an available filter to still see mainly IR light?