Flip HD + Hoya R72 filter = near infrared camera

[JoelMannerino1]

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

[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.

[JoelMannerino1]

@bombaykaizoku ......crazy......ive been doing some of my own research but appearently i need more.......im fascinated by all of this ....raywilliamwalters got some good stuff too.....not counting the subject matter lol...

[JoelMannerino1]

Now i a also have anotger question.....f 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?

[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.