Sunday, November 25, 2012

Extra Credit: 1 Page Reaction to 2 Youtube Videos


Digital Photography 1on1: Episode 1

How Shutter Speed Works

2 Curtain shutters-reveal light to center
     -1st curtain reveals light to camera sensor
-2nd curtain follows behind the light
curtains reset and wait for another shutter release
@ slow shutter speeds (<200ths of a sec shutter speed): 1st curtain opens completely before 2nd begins to follow
@ faster shutter speeds: curtain moves faster, slit becomes smaller

SYNC SPEED

Allows 1st curtain to fully open before 2nd follows
Always set shutter speed to cam’s sync speed or slower (in order to prevent black areas)

CONTROL AMBIENT LIGHT EXPOSURE WHILE USING FLASH

(@ cam’s sync speed) w/o flash: completely black, not enough ambient light for decent exposure
w/ flash: center is lit, but background is black, only light camera sees is the light coming from flash->
to get more ambient light, slow down shutter aka ‘Key Shifting’ using shutter to show more/less shutter by slowing/speeding up shutter
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Digital Photography 1on1: Episode 2

How Light Meters Works

2 types of metering light

Incident: measure light falling on subject itself; set cam&light meter to same shutter speed ISO setting, meter gives correct aperture value&you set it accordingly

Reflective: light travels from source, reflect off subject and into cam-down a lens hitting a mirror, light reflect at 45 degree angle up into pentaprism, finally out eye piece

Set cam to manual mode, set shutter speed to sync speed, set ISO to low setting


Modes on reader

  1. metering ambient light
  2. metering flash
  3. cable sync, plug cable to meter, pull trigger->signal flash to fire->instant reader
  4. wireless meter- no need for cable, radio app tells flash to fire

Measure Light Independently

Turn lumosphere down (keep light from other lights hitting it) point to light source; check ratios&adjust accordingly

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