Define focal distancein physics

GCD-501100M employs integrated enclose design which improves the stability as well as the dustproof ability of the stage. Furthermore, GCD-501100M equipped with center reset function that allows the users to relocate the stage at the center of travel rapidly and conveniently, facilitates complex operations.

Define focal distancein photography

GCD-501100M High precision motorized linear stage is newly developed by Daheng. GCD-501100M consists of high precision ball screw and fine linear guide. The combination of GCD-501100M with GCD-0401(Motorized stage controller) is able to provide super high accurate linear motions (error in microns). The features of high precision and high stability are highly demanded by the applications of THz spectrometer and fs/ ps Lasers micromachining systems.

"They have a fixed focal length, a fixed size. They are made from materials that give you the lensing property you want, but they don't really have any dynamic characteristics."

The museum includes a camera the C.I.A. built for Mr. Tolkachev, with a fixed focal length to ensure his pictures would be less blurry.

The lens was so heavy that he had to screw it into his tripod, and when he aimed at a wall in his apartment, the distance was too short for the focal length.