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On the other hand, the eye-glass must not be of such small focal length that the image appears indistinct and contorted, or dull for want of light.
The rapidity of a lens depends mainly on its aperture and its focal length.
The speed of a photographic lens depends on the ratio of the effective aperture to the focal length.
To overcome this obstacle to clear vision, and also to secure magnification, the focal lengths of the instruments were greatly extended.
The aperture and focal length on the camera are set according to need.
The procedure was applied to the 3 m focal length off-axis parabola.
The focal length of the evolved system is 0.992298 and the sum of the distances is 0.09881 ($1/10).
Therefore, the focal length becomes the key condition of the threshold producing the plasma in the condition of identical incident energies.
The principle of choosing a focal length is to reduce the effects of the closure as weak as possible.
The pixel pitch and the focal length of the cameras are 0.0185 and 2.5 mm, respectively.
The focal length is longer for a low-intensity front.
It may be necessary to set a larger focal length because of obstructions in the robot's path.
Such an individual receives a large numerical penalty equal to 500,000 plus 500,000 times the distance by which the back focal length is offset.
This is to be expected as it is known to be associated with the focal length of the laser.
It is obvious that the shorter the focal length is and the stronger the intensity at the focus will be.
The laser beam is focused by a 25-cm focal length silver mirror through a 0.5-mm-thick fused-silica window into the laser-gas interaction chamber.
Three images are taken at the same positions as above, and for the same focal length and beam diameter.
The injected beam radius is 3 cm for the 3-m focal length and 6 cm for the 6-m focal length.
This potential does not degrade significantly as the focal length increases.
