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Video Basics – Chapter 4 The Video Camera.

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Presentation on theme: "Video Basics – Chapter 4 The Video Camera."— Presentation transcript:

1 Video Basics – Chapter 4 The Video Camera

2 Chapter 4 Basic Camera Function & Elements Technical Jargon
Two-Chip high-resolution imaging device Camera that will produce excellent color, good light, dark contrast, sharp picture.

3 Chapter 4 Fast Lens 10:1 Power Zoom Lens Not related to Speed
Lens will allow enough light to video in low light conditions 10:1 Power Zoom Lens Allows smooth transition from wide to close-up or vise versa using toggle switch

4 Chapter 4 High Variable Shutter Speed
Prevents fast moving objects from looking blurred.

5 Chapter 4 Auto Iris Auto Focus Auto White Balance
Lens will sense how much light is needed and adjust automatically. Auto Focus Keeps picture sharp Auto White Balance Colors look good/exact/true

6 Chapter 4 Built-in Character Generator Lux
You can print text on the video picture Lux Light – you can record in very low light levels. 3 Lux…2Lux…1 Lux

7 Chapter 4 Low-noise Gain Nothing to do with sound
The ability of the camera to produce pictures in very low light conditions without little picture deterioration (snow)

8 Chapter 4 Flying Erase Head High signal-to-noise ratio
Allows you to edit in the camera Insert scenes over video without any breakup of signal High signal-to-noise ratio Nothing to do with sound Picture signal is stronger than any electronic interference

9 Chapter 4 Built-in Time Code Generator
Each video frame is assigned a number Like your street address Editing unit will read this address Numbers help you find scenes

10 Chapter 4 Audio Connections Pro cameras – XLR (the best/reliable)
Consumer Cameras – Mini & RCA

11 Chapter 4 Video Camera Function
Main Function -- translate an optical image into electrical signals that are reconverted by a television receiver into visible images.

12 Chapter 4

13 Chapter 4 Beam Splitter – splits White light into Red, Green, & Blue light.

14 Chapter 4 CCDs – transform RGB into electrical energy, which is amplified and processed, then reconverted into video pictures by the Viewfinder.

15 Chapter 4 VHS Camera

16 Chapter 4 VHS Camera

17 Chapter 4 The Lens Focal Length Determines what the camera can see.
How much of a scene we can see through a lens from a specific position and how magnified distant objects look

18 Chapter 3

19 Chapter 4 Lens Glass Filter Grooves .755 mm Info on ring

20 Chapter 4 Focal Length Short Focal Length – wide angle view
Zoom Out Long Focal Length – Narrow but much closer view of scene Zoom In

21 Chapter 4

22 Chapter 4 Zoom Range Refers to how close a view you can get when zooming In from the wide angle position. The higher the first (14x1) number the closer you can get.

23 Chapter 4

24 Chapter 4 Zoom Range 10x1 14x1 24x1 48x1 Etc.

25 Chapter 4 Lens Speed Fast Lens Slow Lens Check Lens Speed
How much light can pass through a lens to the imaging device. Fast Lens Allow great amount of light Slow Lens Allows limited amount of light Check Lens Speed Lower the f-stop number = fast lens

26 Chapter 4 Lens Iris Controls light passing into camera
Functions similar to your eyes Bright lights the iris closes down Low light, the iris opens up Measure iris opening via f-stop 1.4, 2.8, 4, 5.6, 8, 11, 16, 22 Lower number more light

27 Chapter 3

28 Chapter 3

29 Chapter 4 Video Camera Iris Studio Camera Demonstration

30 Chapter 4 Auto Iris Adjusts lens opening automatically to the optimal aperture – allows correct amount of light into camera.

31 Chapter 4 Fast Shutter Speed – 1/5000, 1/10,000
High f-stop number – 16, 22 (Min light) Automatically adjusts f-stop Slow Shutter Speed – 1/4, 1/8 Low f-stop number – 1.4, 2 (Max light)

32 Chapter 4 Beam Splitter Separates White light into Red, Green, Blue
Red, Green & Blue are called the primary colors. RGB – basic light colors from which all other light colors can be mixed

33 Chapter 4 Beam Splitter Series of prisms and filters locked into a prism block Imaging devices connected to the prisms transform beams into electrical energy called the RGB video signals

34 Chapter 4 RGB

35 Chapter 4 Imaging Device Changes light into electric energy
CCD – Charge-coupled device Small, silicon chip Chip has light sensing picture elements called pixels Pixels change light energy into electric current Determines video picture quality

36 Chapter 4

37 Chapter 4 CCD Pro cameras have 3 CCDs One for each color CCD for Red
CCD for Green CCD for Blue

38 Chapter 4 Video Processing
RGB signals referred to as chrominance signal Brightness signal referred to as luminance signal Combined Chrominance and Luminance = Composite Signal or NTSC signal. NTSC is U.S. standard format

39 Chapter 4 Viewfinder Small TV monitor either B&W of color

40 Chapter 4 Video Cameras Studio Cameras Field Cameras
ENG – Electronic News Gathering EFP – Electronic Field Production

41 Chapter 4 Studio Cameras

42 Chapter 4 Studio Camera Chain Camera Head - Body Power Supply
Sync Generator – uniform electrical pulse to synchronize the scanning of the video pictures in a variety of equipment (monitors, viewfinders) CCU – Camera Control Unit

43 Chapter 4 Camera Chain

44 Chapter 4 CCUs

45 Chapter 4 Video Production Cables BNC RCA UHF XLR Quarter Inch

46 Chapter 4 Aspect Ratio The relationship between the height and width of a video picture. Standard TV set is 3:4 3 units high and 4 units wide HDTV is 3:5 3 units high and 5 units wide

47 Chapter 4 ENG/EFP Cameras Designed to be used by one person
High quality Battery operated Tape deck inside camera Microphone on camera or external mic can be connected

48 Chapter 4 ENG EFP $10K $15K $25K & Up

49 Chapter 4 Dockable Cameras Camera body and VCR are separate
VCR plugs into back of Camera

50 Chapter 4 Studio Conversion Unit
Converting ENG/EFP camera into studio camera

51 Chapter 4 Studio

52 Chapter 4 Chapter Review Key Terms – Beginning of chapter
Key Concepts – End of chapter

53 Chapter 4 Questions?

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