Exam 3 Law Enforcement Photography

Question 0

Explain the Factors that Affect Photographic Images

Answer 0

LISA
L-Light
I- ISO
S- Shutter Speed
A- Aperture
Light=-Natural or Artificial
ISO
-Sensitivity of the Sensor
-**Adjust the ISO up for Low-Light or dynamic Surveillance Operations
Will be adjusting ISO a lot on night time surveillance

              Shutter Speed

• Amount of time sensor exposed to light
• Slowest speed for handheld photography =1/60th (minimum shutter speed for handheld photography)
• Controls “motion blur”****
• Stops subject’s motion and movement****
• Displayed in fractions or whole seconds

              Aperture

• Technically defines as the physical opening in the optical instrument
• Measured in f-Stops
• Control “Depth of Field”****

Question 1

Identify the common Elements of a Digital Camera System

Answer 1

Applies across the board to all camera systems

• Law Enforcement Standard is 6 mega pixel (6 million pixels)*
• Point and Shoot
• widely available
• inexpensive
• easy to use
• limited in resolution and ability
• SLR (Single Lens Reflex)Cameras have many more abilites
• Man more abilities for LE
• Exchange lenses
• Timed exposures
• Records on SD type digital media cards
• Zoom lenses

Question 2

List Techniques Associated with Photographing and Videoing a Crime Scene and/or Physical Evidence

Answer 2

Identifier
(first and last photograph taken)
Name, Date, location, case type and agency

Photo Log

• Photo #(s)
• General Description of photo
• Reminds why photograph was taken

Reconstructive Photography
Overall- big picture, establishes our location, establishing shot
Intermediate- relationships between evidence & evidence
Close-up- 90 degree angle, isolated compositions of individual items

All above WITHOUT Markers

Both Pristine Condition AND with Markers

Drop Markers and do Overall, Intermediate, Close Up again

Question 3

List Techniques Associated with Photographing and Videoing a Crime Scene and/or Physical Evidence

VIDEO

Answer 3

Video Techniques

Approach Same way as Photography
*Disengage the Audio, is possible
Prior to and after Search Warrants

3 basic camera moves**

• Pan (horizontal)
• Tilt (Vertical)
• Zoom

All moves should be Smooth and Deliberate**
3-5 Second Pause

Finalize the Disk*****

Question 4

Identify Shooting Modes

Answer 4

*****P-Programmed Auto*****
S-Shutter Priority
A-Aperture Priority
M-Manual
Auto
No Flash Auto 
ortrait
Landscape
Moving Subject
Close Up

Question 5

General Info

Answer 5

Forensic Use-Macro Lens 60mm
Standard Crime Scene = 18-55mm Lens*
Wide Angle (Close Distance) = 18mm and below*
Telephoto (Long Distance) = 105mm and up***** (surveillance)
1 mm = 1 foot to target

Forensic/Examination Quality = 100 ISO only
General Crime Scene = 100-400 ISO
Surveillance/Low Light= 800 +