Light pad as a light box
Light pads are thin surfaces fitted with arrays of small LEDs and may typically be used for tracing and drawing applications. Strangely they are sometimes advertised as being suitable for viewing X-Ray images (is this a common need outside a hospital?) and this may suggest that they would also work for viewing photographic negatives. Light Pad However there is a problem, the surface is shiny and prone to specular reflections, you can see the reflection of my LED OttLite desk lamp in the image above. Even worse is that the array of LEDs shows through when trying to back light an image, so for example here is how a colour slide (positive) looks: Slide viewed directly with LED array showing Not very good but the solution is actually very simple, a layer of diffusion material is needed and this can be done with a sheet of paper. The paper should not be coloured and should be thin, I found a sheet of 41gsm tracing paper works well. To see the difference this makes here's...