Application of Wide-Angle Optics to Moderately High-Speed Motion Picture Cameras

1953 ◽  
Vol 60 (1) ◽  
pp. 38-48 ◽  
Author(s):  
H. E. Bauer ◽  
A. W. Blake
Keyword(s):  
Motion Picture ◽  
High Speed ◽  
Wide Angle

scholarly journals Design of Wide Angle and Large Aperture Optical System with Inner Focus for Compact System Camera Applications

2019 ◽  
Vol 10 (1) ◽  
pp. 179 ◽  
Author(s):  
Hojong Choi ◽  
Jaemyung Ryu
Keyword(s):  
Optical System ◽  
High Speed ◽  
Resolving Power ◽  
Wide Angle ◽  
Phase Detection ◽  
Half Angle ◽  
Stepper Motors ◽  
Angle Of View ◽  
Floating Type ◽  
Focusing Lens

Conventionally, a bright, very wide-angle optical system is designed as a floating type optical system that moves two or more lens groups composed of multiple lens in order to focus accurately. These have been widely used as phase detection auto focus (AF) methods within conventional digital single-lens reflex (DSLR) cameras. However, a phase detection AF optical system cannot be used when recording motion pictures. In contrast, a compact system camera (CSC) performs AF by the contrast method, where a stepper motor is used as the driving source for moving the optical lens. Nonetheless, to ensure that the focusing lens is lighter, these stepper motors should not have high torque and AF must be possible by moving only one lens. Yet, when focusing is performed with only one lens, aberration change due to focusing lens movement is magnified. Therefore, a very wide-angle optical system comprised of a half-angle of view more than 40 degrees and F of 1/4 has not been developed. Here, a very wide-angle optical system was designed with high resolving power that enables high speed AF, even in contrast mode, by moving only one lens while minimizing aberration change.

A high-power stroboscope for use with a fastax high-speed motion-picture camera

1967 ◽  
Vol 45 (4) ◽  
pp. 249-250
Author(s):  
D. M. Harvey ◽  
M. W. Gunn ◽  
T. W. Hoffman
Keyword(s):  
Motion Picture ◽  
High Power ◽  
High Speed

A Flood Flashlamp for High-Speed Motion-Picture Photography

1959 ◽  
Vol 68 (9) ◽  
pp. 599-601 ◽  
Author(s):  
W. C. Fink
Keyword(s):  
Motion Picture ◽  
High Speed

scholarly journals Study of Lubricant Jet Flow Phenomena in Spur Gears

1975 ◽  
Vol 97 (2) ◽  
pp. 283-288 ◽  
Author(s):  
L. S. Akin ◽  
J. J. Mross ◽  
D. P. Townsend
Keyword(s):  
Motion Picture ◽  
High Speed ◽  
Drop Size ◽  
Gear Tooth ◽  
Jet Flow ◽  
Spur Gear ◽  
Spur Gears ◽  
Gear Teeth ◽  
Flow Phenomena ◽  
Oil Jet

Lubricant jet flow impingement and penetration depth into a gear tooth space were measured at 4920 and 2560 using a 8.89-cm- (3.5-in.) pitch dia 8 pitch spur gear at oil pressures from 7 × 104 to 41 × 104 N/m2 (10 psi to 60 psi). A high speed motion picture camera was used with xenon and high speed stroboscopic lights to slow down and stop the motion of the oil jet so that the impingement depth could be determined. An analytical model was developed for the vectorial impingement depth and for the impingement depth with tooth space windage effects included. The windage effects on the oil jet were small for oil drop size greater than 0.0076 cm (0.003 in.). The analytical impingement depth compared favorably with experimental results above an oil jet pressure of 7 × 104 N/m2 (10 psi). Some of this oil jet penetrates further into the tooth space after impingement. Much of this post impingement oil is thrown out of the tooth space without further contacting the gear teeth.

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