Photography

Question 1

Why might it be important to manually focus a macro lens

Answer 1

Autofocus may not focus on the intended part of the image, whereas with a manual focus you can ensure it does. This is especially important as the depth of field is likely to be shallow

Question 2

What does TTL stand for

Answer 2

Through the Lens

Question 3

If bruising or swelling masks an injury which has broken the skin, what photography technique can be used to capture the mark

Answer 3

Ultra-Violet Photography

Question 4

A victim of an assault wears glasses and needs their facial injuries photographed, what is the correct method?

Answer 4

One with glasses and one without

Question 5

When taking long exposure images, why is it best to avoid having light sources present

Answer 5

As the light will cause over exposure due to the slow shutter speed letting in too much light and cause hotspots with data lost

Question 6

Why might an aperture of F11 be a good starting guide for crime scene photography?

Answer 6

For a good depth of field

Question 7

Why must all files on a camera never be deleted?

Answer 7

Contravenes Home Office Digital Imaging Procedures and Criminal Procedure and Investigations Act 1996

Question 8

Explain Ambient Light

Answer 8

It is the natural lighting already in the scene without adding a torch or flash

Question 9

2 times you would use a tripod

Answer 9

1:1 Images

When taking photos in low light with a long exposure

Question 10

When photographing the front of a building, how can distortion be avoided?

Answer 10

Use 35mm or above

Stand as far back as possible and take the photo front on and at straight angle

Question 11

Which lens or focal length is best for providing detail

Answer 11

Macro Lens or 35mm

Question 12

What problem may occur when photographing a window with flash

Answer 12

Hotspots in the reflection of the glass causing a loss of data in the image

Question 13

What is the slowest shutter speed which can be used when hand holding the camera?

Answer 13

1/60

Question 14

If there is an area flashing on the highlight loss indicator when reviewing an image, what does this mean?

Answer 14

The area is overexposed, so no data has been collected in that part of the image,

Question 15

An inspector wants you to photograph how dark a scene is, how would you do this?

Answer 15

You cannot do this, it is not possible to photograph darkness levels

Question 16

Explain the term aperture

Answer 16

How wide the lens is open through which light passes

Question 17

What two pieces of equipment should be used to prevent camera shake when taking long exposure images?

Answer 17

Tripod

A remote shutter control

Question 18

Name one advantage and one disadvantage to using a wide-angle lens or focal length

Answer 18

Advantage: can fit more in the image
Disadvantage: causes distortion

Question 19

A crime scene includes a room with large windows, it is half lit with sunlight leaving half the room in shadow. Describe the process to balance the light.

Answer 19

Spot meter to 0 on the brightest point in the scene according to the light meter
Compose the shot
Add flash to the darker areas

Question 20

Name three types of evidential marks that can be photographed for 1:1 comparison

Answer 20

Footwear marks
Toolmarks
Fingermarks
Tyre Marks
Bite marks/injury

Question 21

What are the main five Home Office Imaging Procedures

Answer 21

Obtain Authority
Start your audit trail 
Check Equipment is operational
Take pictures but do not delete any
Copy all files to storage (master and working copies)

Question 22

What does highlights on the image review?

Answer 22

Once the photo has been taken it will show any areas which are over exposed and there is no data captured. If this area of the image is important then another photo should be taken.

Question 23

What is does a histogram show on the cameras image review?

Answer 23

is a digital readout of the colour and light in the image

Question 24

What shape is a lens?

Answer 24

Convex

Question 25

What are the 3 physical ways to adjust the exposure, can be adjusted?

Answer 25

Shutter speed
Aperture size
Ambient Light Level (use lights, open curtains, use a torch, sunlight)

Question 26

What is the electronic way to adjust exposure on the camera and what is it’s downside?

Answer 26

ISO setting

least often changed, the changes how sensitive the image is, as it can create digital noise

Question 27

Aperture size - why is a larger aperture size better for crime scene photography

Answer 27

Long depth of Field (big F Number) Everything in focus

Shallow depth of Field , (smaller F number) only a small area in focus