Despite its radio brilliance, however, it is extremely faint optically, and is only visible on long-exposure photographs.

Zeta-1 Scorpii can also be distinguished from Zeta-2, due to the latter's orange hue especially in long-exposure photographs.

The separate viewing lens is also very advantageous for long-exposure photographs.

Since the mid-1980's, whenever he can steal a few hours to himself, Mr. Baron has been taking long-exposure photographs of seascapes.

It is well seen in long-exposure photographs, although observers under very dark skies may be able to see it with the naked eye.

Under ideal observing conditions, some hint of nebulosity may be seen around the cluster, and this shows up in long-exposure photographs.

To look for Planet X in a particular area of the sky, he took two long-exposure photographs a few days apart.

The glow lasts for about 30 seconds, but the effect can be documented by a long-exposure photograph.

Any glow detected may be documented by a long-exposure photograph.

In long-exposure photographs, the entire temple appears to be on fire.