But the advantages of through-the-lens viewing far outweigh the difficulties involved in manually focusing an SLR.

This is nothing new; it is pretty much impossible to focus on a blank wall manually.

For all that trouble, one might as well focus manually.

Users can manually focus the lens during a recording.

Of course you can focus manually with the Tamron if you want to.

He focuses manually, uses a lens shade and rarely puts his camera on a tripod.

(lecargo.org) Trying to shoot at f1.8 when focusing manually is v..

This helps my dad, who has trouble focusing manually.

An optical viewfinder instead does not amplify the light, so that it becomes difficult to frame and manually focus when there is not sufficient light.

Surgical specialties focus on manually operative and instrumental techniques to treat disease.