View
235
Download
4
Category
Tags:
Preview:
Citation preview
Exposure & Settings: P-22021
Exposure & Settings
Exposure & Settings: P-2202
Topics
Relationship between ISO, shutter speed and aperture
Purpose and use of pre-focus Exposure Lock
Selecting various exposure modes
Best settings for image resolution and quality for CAP missions
2
Exposure & Settings: P-2202
Camera Lens & Shutter
Digital cameras work by opening a shutter for a brief time to let in light that interacts with a light-sensitive photo receptor.
Electrical charges are converted into digital bits and stored on a memory card creating images.
3
Exposure & Settings: P-22024
Photography Terms Aperture: Controls the amount of light that reaches the picture sensor
– Measured in “f number”, e.g. f scale: f1.2 – f22, each increment is a “stop” or ~2x the light
– The more light, the faster the shutter speed for a good exposure Shutter Speed:
– Typically measured in fractions of a second (e.g. 1/800th of a second, or just “800”)
– Faster shutter speeds reduce blurring of image due to motion or vibration
Example relationship of aperture vs. shutter speed for a given ISO setting
Exposure & Settings: P-22025
Photography Terms Focal length (Zoom):
– Measurement of distance from lens to picture sensor (in millimeters, mm)
– The larger the number, the more the zoom & the higher the sensitivity to effects of vibration
ISO: Adjusts picture sensor’s sensitivity to light
– Higher number means higher light sensitivity & faster shutter speeds
– But, higher numbers may result in a more “grainy” or “noisy” picture
Focal Length (Zoom)
PictureSensor Lens
LowZoom
HighZoom
Exposure & Settings: P-2202
Camera Switch Settings6
Lens AF: AF
Optical Stab.: On
Camera AF: AF
Mode Sw: Auto/No Flash
Power On Shutter Release
Camera display
should look something
like this when set up
correctly
Exposure & Settings: P-2202
Pre-Focus Exposure Lock
Difficult to use Manual Focus in an aircraft Autofocus- lens/camera work together as a unit Pre-Focus Exposure Lock allows the camera to
make focus adjustments prior to actually taking image.– Activated by pressing shutter release button briefly at a
half-way point.– Activating pre-focus causes camera to lock autofocus
into sharp focus and measures light level to determine exposure.
7
Exposure & Settings: P-2202
Exposure Modes Automatic (A) mode –
camera determines combination of aperture, shutter speed and sensitivity based on camera’s light metering system.
– Auto with Flash Off is recommended setting
Program (P) mode- similar to Automatic mode but allows for manual modification of aperture or shutter speed
8
Exposure & Settings: P-2202
Auto Focus Modes
AF-A is recommended to help ensure a focused photo
9
Exposure & Settings: P-2202
Single Shot vs Burst Mode
Single shots allow camera to adjust to changing light and focus conditions after each shot.
– Best use is in shifting lighting conditions (ie: clouds)
Continuous Shooting (Burst) Mode locks in a setting and utilizes that setting for a series of shots taken in continuous manner.
– Best use is in turbulent conditions
10
Exposure & Settings: P-220211
Image & File Size TradeoffsD90 Image Size vs. Quality Settings
= ADIS Kit: CAP NHQ recommended settings
(L: quality stays higher when image is enlarged)
(compression ratio ↑, quality ↓)
Image Quality Setting
Exposure & Settings: P-2202
D90 GPS Considerations
Check Auto Meter Off Delay Status– Ensures GPS is stays powered up
between photos– Recommend setting to 30 minutes– Access thru MENU, ,
TIMERS/AE lock, Auto Meter Off Delay
12
Auto Meter Off Delay
Exposure & Settings: P-2202
Summary of Camera Settings14
6
Install memory card (card may already be in the camera) by opening the door located on the right side of camera and gently pushing the card in until it clicks in place. A light located on the back-right of the camera will briefly illuminate to confirm the card is seated. The card can be removed by pushing the card in and it will pop out
Set the lens auto focus switch to AFSet the camera auto focus to AF
Set Program Mode selector to Auto with no flash
Recommended