CTS EXAM: KEY AND LATEST A+ QUESTIONS AND
ANSWERS
• Application of color temperature
o Video cameras need electronic adjustments for what "white" it should be
o Monitors or projectors change whiteness based on lighting conditions of environment
• Stage lighting
o Leko - focused beams of light
o Parley - covers large areas
• Video Conference Lighting
o 4 areas commonly lit
Key light - brightest spot on subject
Fill light - fills dark spot created by key
Back light - shines on subject's hair and shoulders
Wall wash - lights back spot
Video Conference Lighting: conditions
o Contrast of image must be w/in contrast ratio of camera
Otherwise clipping will occur
Causes person's face to be too white
o Use 3200 K lights for indoor with little outdoor lighting
o For outdoor lighting, use 5600 K lamps
Image Capture light components
o Lamp - source of light
o Light - term for both mount for lamp and lamp
o Fixture - lamp housing
o Video camera -
acts like a transducer (device that changes one type of energy to another)
Converts light to electronic info
o Lens
Focal length
, distance in mm between center of lens and pt where image comes into focus
• Shorter FL -> wider the angle of the image and angle of view
• Zoom lens alter the FL which alters the angle of view
• Back focus - ensures focus tracking
Aperture
opening of a lens regulating how much light gets into the imager
• Measured in F/stops
• Based on relationship between diameter and FL
• Larger f/stop = smaller opening
Depth of Field
area in front of camera lens that is in focus -> from closest to fartherst
• Depends on aperture
o Smaller ap. = larger depth of field
o Think of squinting when trying to see things far away
o Imager
Light sensitive electronic chip behind lens
Made up of sensors (pixels) that convert light into electronic output
Prism - beam splitter that filters light into RGB
• On single imager camera-> no prism, uses color filter
Cheaper cameras have one chip
High def have 3 chips
Shutter - regulates how much time light can charge the imager
• Set by frame rates
• Need high shutter speeds for fast motion
Imager two types
2 types -
• charged coupled device (CCD)
• Complimentary metal oxide semiconductor (CMOS)
o Signal Types
Sync
ANSWERS
• Application of color temperature
o Video cameras need electronic adjustments for what "white" it should be
o Monitors or projectors change whiteness based on lighting conditions of environment
• Stage lighting
o Leko - focused beams of light
o Parley - covers large areas
• Video Conference Lighting
o 4 areas commonly lit
Key light - brightest spot on subject
Fill light - fills dark spot created by key
Back light - shines on subject's hair and shoulders
Wall wash - lights back spot
Video Conference Lighting: conditions
o Contrast of image must be w/in contrast ratio of camera
Otherwise clipping will occur
Causes person's face to be too white
o Use 3200 K lights for indoor with little outdoor lighting
o For outdoor lighting, use 5600 K lamps
Image Capture light components
o Lamp - source of light
o Light - term for both mount for lamp and lamp
o Fixture - lamp housing
o Video camera -
acts like a transducer (device that changes one type of energy to another)
Converts light to electronic info
o Lens
Focal length
, distance in mm between center of lens and pt where image comes into focus
• Shorter FL -> wider the angle of the image and angle of view
• Zoom lens alter the FL which alters the angle of view
• Back focus - ensures focus tracking
Aperture
opening of a lens regulating how much light gets into the imager
• Measured in F/stops
• Based on relationship between diameter and FL
• Larger f/stop = smaller opening
Depth of Field
area in front of camera lens that is in focus -> from closest to fartherst
• Depends on aperture
o Smaller ap. = larger depth of field
o Think of squinting when trying to see things far away
o Imager
Light sensitive electronic chip behind lens
Made up of sensors (pixels) that convert light into electronic output
Prism - beam splitter that filters light into RGB
• On single imager camera-> no prism, uses color filter
Cheaper cameras have one chip
High def have 3 chips
Shutter - regulates how much time light can charge the imager
• Set by frame rates
• Need high shutter speeds for fast motion
Imager two types
2 types -
• charged coupled device (CCD)
• Complimentary metal oxide semiconductor (CMOS)
o Signal Types
Sync
