The time of day and weather change the optical effects.

At first they seemed to be optical effects, as though the eye itself were playing tricks.

Through his mastery of the lens several optical effects were created.

The only clothes he owned were of expensive natural fiber, with no optical effects at all.

Then you can argue about optical effects of one object framed against a smaller body.

The scenes were further enhanced with haze and other optical effects.

No optical effects or other "cosmetics" are allowed and only one added light source, if absolutely necessary.

Other phenomena are simply interesting aspects of optics, or optical effects.

This allows nonlinear optical effects to be seen at low powers.

Such an observer will experience some interesting optical effects.

Her Minimalist paintings used simple lines to explore the optical effects of color.

Now, when I examined the star- stone, the optical effects indicated the dextral situation.

Optical effects were used to make the planes look as if they were entering the set.

As well as optical effects he was interested in distinguishing form from colour.

Therefore, the achievable electromagnetic and optical effects can be extended.

He has proposed that the reported observations were optical effects caused by prolonged staring at the sun.

Spectacular optical effects are not limited to squid or cephalopods.

Optical effects were added to represent the firestorm and the sehlat.

As this would have required subcontracting the optical effects, Republic saved money by not using it.

I managed to kill a good thirty seconds thinking about interesting and amusing optical effects you could produce with a watch like this.

In the late 1980s, digital compositing began to supplant optical effects.

The film was still a rough cut at this stage, missing completed titles and lacking special optical effects.

Printmaking The picture is based on true optical effects, reflection and refraction.

Americans are too literal-minded, the argument ran, to adopt a style based on the optical effects of light and shadow.

The stuntmen were filmed later, added by optical effects.