Extreme dark photographic filter like the opaque Wratten 87 can be used without problems, as they cover an thus darken only the taking lens.

Then she noticed the sun, nearly straight ahead in the rocket's line of flight, its brightness considerably reduced by dark filters.

It's very dull and red-I don't even need dark filters on the telescope.

The image was almost too brilliant to bear, even after Saa slid a dark filter across the screen.

She put it on: a dark filter covered the upper two-thirds of her face.

Extremely dark filters of the proper sort are needed for the welder to be able to look at the intensely glowing metal being welded.

He raised the dark filters inside his helmet, one thickness after another, until he could endure the glare.

On L-5 you weren't supposed to look toward it without a dark filter.

Very cautiously, I opened up the dark filters on the 'night' side of my suit, and turned my head to look out at the stars.

He peered through the darkest filter available.