Exposure & Settings: P-2202 1 Exposure & Settings.

Exposure & Settings: P-22021

Exposure & Settings


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

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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.

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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


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


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


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.

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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

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Auto Focus Modes

AF-A is recommended to help ensure a focused photo

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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

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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


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

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Auto Meter Off Delay


Summary of Camera Settings14

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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

Exposure & Settings: P-2202 1 Exposure & Settings.

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Transcript of Exposure & Settings: P-2202 1 Exposure & Settings.