These images become visible only if viewed through the special lens.

I developed the basic technology, got specialists to make the special lenses and cameras.

People can look at the Sun if they use special lenses that make it safe.

Trauma also had special lenses attached to his eyes for targeting.

Perhaps it had actually been a good break, having to fetch these special lenses instead of regular ones.

According to some critics who recognized the technical skills and special lenses used for the film, "every scene could have been a painting".

"Maybe he took them from outside, through a window, with a special lens," Eric suggested.

He worked on various projects including one that allowed for reading newspapers under water with special lenses.

An ordinary camera fitted with a special lens would take in the signals.

The episode was shot through a special lenses to make it more reminiscent of the decade.