"We're not yet at optimum distance for full effect-iveness."

Some experts claim that the optimum viewing distance is about twice that.

"We have achieved optimum distance, sir," one of the techs sang out.

This was considered the optimum distance to penetrate the armor of the cavalry.

The optimum distance between the can and workpiece is around one foot (30 cm).

About eighteen inches is the optimum distance between eye and page.

The whole problem of optimum distance, he wrote.

All problems resolved in one go because now for the first time question of optimum distance becomes an issue for the viewer.

There were also technical problems to solve, the first one being to determine when the aircraft was at optimum distance from its target.

The optimum distance of the target depends upon the energy of the arrow.