Panasonic AG-DVX100B - Camcorder - widescreen - 410 Kpix - optical zoom: 10 x - Mini DV

!#8#Panasonic AG-DVX100B - Camcorder - widescreen - 410 Kpix - optical zoom: 10 x - Mini DV

Brand : Panasonic
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Post Date : Dec 26, 2011 16:00:15
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Already used for film and TV program production as well as news gathering, Panasonic's DVX100 series has now evolved further with the AG-DVX100B. The AG-DVX100B debuts as the industry's first DV camera-recorder to allow camera-to-camera time-code synchro and user-settable file transfer. This allows the AG-DVX100B to be used for simultaneous multi-camera recording techniques often used in video production. Additionally, the new model offers remote focus and iris control for easier operation when mounted on a jib arm or tripod. The Black Sapphire AG-DVX100B offers the acclaimed performance and multiple functions of previous high-end DV camera-recorders models. In addition to superior image quality, high sensitivity, 24P/30P Cinema mode, and manual operation, it has the specifications needed for full-fledged professional video production. Lightweight design with balanced grip The AG-DVX100B introduces a new design that ends the contradiction between a compact, lightweight body and a stable, secure hold. The center of balance is located precisely at the handgrip. Because there's no need for a wide-angle conversion lens, the weight balance is ideal for comfortable shooting. The AG-DVX100B's short body and light weight - it weighs only 4.189 lb (1.9Kg) in operating condition* - means free, easy maneuverability. Plus, the low-center-of-gravity design and new skeleton lens hood greatly improve forward vision. *Camera-recorder with DV cassette tape and supplied battery. New AG-DVX100B functions (compared with the AG-DVX100A) Allows synchronous setting of time-code values in multiple cameras User-settable files can be copied from camera to camera Remote control of focus and iris (wired) EVF and LCD can display images in 16:9 letter-box format.

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The Fascinating World of Liquid Microphones and Their Functions

!±8± The Fascinating World of Liquid Microphones and Their Functions

It all begun with liquid transmitter, which was the first transmitter developed by Alexander Graham Bell and Elisha Gray almost simultaneously, in 1876. And that later came to be known as liquid microphones.

This transmitter had a diaphragm attached to a funnel shaped mouthpiece. There was a metal pin at the center of the diaphragm, extended till the metal cup below, which contained a dilute acid. As the diaphragm moved, the pin also moved up and down and thus the difference in resistance could be observed. And for sound reproduction, the pin and the cup were connected to a battery and telephone receiver so that any sound in the mouthpiece was reproduced and came with lucidity.

Besides Bell, Elisha Gray was another inventor of the liquid microphones as both the experimentation had taken place simultaneously. Gray's liquid transmitter consisted of a diaphragm attached to a movable conductive rod dipped in acidic solution.

It also had a fixed rod placed beside the first one and was connected to a battery. The resistance varied with the separation in the rods, which was caused due to the variation in the sound pressure. Basically, the difference between Bell's transmitter and Gray's transmitter was the rod. Elisha Gray used brass rod instead of the needle.

However, in this way the first ever working microphone came into being. Though they are not in use at present but are the base of the superior models developed later (as for example, Thomas Edison who gave the device a new form).

Most amazingly, the liquid microphones are famous till date since the first phone conversation between Bell and Watson was through liquid microphone. However, later, these microphones were developed and were used for musical purposes.

David Edward Hughes was another inventor who developed the concept of microphone and thus modern liquid microphones appeared. His experiment was really amazing and different. He demonstrated the liquid transmitter by mounting it on a sound box that contained insects, whose scratching was considered to be amplified. The bottom line was that it worked for the ears the same way as the microscope worked for the eyes.

Later, other scientists like Majoranna, Chambers, Vanni and Sykes worked on the concept of liquid microphones to make it usable for clear sound reproduction. The base of this microphone was the liquid that was used, that even included water. There was a conception regarding water microphones that was developed even before liquid one but however, it proved to be impractical.

Majoranna used a reservoir that held the conductive liquid. He even used a voltage of 780 watts. And this gave birth to a new conception of using high current to build up microphones. C. Egner and J.G Holmstrom invented one of the high current microphones that were water-cooled and consisted of 16 separate carbon units. Voltages and current from 10 volts at 20 amperes to 30 volts at 10 amperes could be handled by connecting the units in different series.

In this manner the liquid microphones were transformed to modern ones and were used for various purposes in different times. Like during the World War I, then after that they were used for public address and later for broadcast in radio station, television and films.

The Fascinating World of Liquid Microphones and Their Functions

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