He continued looking through the red filter for a full two minutes, as he began to push the car to its limits.

In the days of black and white a red filter could turn a blue sky almost black.

When filming was done through a red filter the sky would appear absolutely black.

When producing the panorama, the camera also used the red filter.

When using a red filter he found there was a lot of heat produced.

"Our infrared film and red filter can cut through this stuff," Tom said.

One man had a flashlight with a red filter clipped to his harness.

Switch to a longer lens, and make a second exposure on the same piece of film with a red filter.

These mattes are easy to create because the bright blue color, when run through a red filter, turns black.

The final color image was assembled from individual exposures taken through blue, green, and red filters.