Night Optics and Observation

Question 1

What are the two types of Passive Night Sights?

Answer 1

• Thermals

- Ambient light NVDs

Question 2

What are the 4 types of Ambient Light NVDs?

Answer 2

Generation I, II, III, and IV

Question 3

Which type of Ambient Light NVDs is best for MOUT?

Answer 3

Generation II+

Question 4

Generation IV is referred to as what?

Answer 4

“Filmless and gated image intensifiers”

Question 5

What are the Night Aiming Devices?

Answer 5

The Advanced Target Pointer Illuminator Aiming Light (ATPIAL) or PEQ-15

Question 6

The PEQ-15 is classified as what kind of laser device?

Answer 6

Class 3b

Question 7

What weapon systems can the PEQ-15 be mounted on?

Answer 7

M4/M16-A4, M249, M240, M2, and Mk19

Question 8

NVGs can “see” what ranges in the spectrum?

Answer 8

Visible light, near IR, mid IR, and far IR (near, mid, and far IR are also the “thermal” spectrum)

Question 9

What is the field of view with NVGs?

Answer 9

40 degrees (the human eye is about 170)

Question 10

NVGs give you what clarity?

Answer 10

20/25 - 20/40 at best, with optimal illumination and contrast

Question 11

NVG users tend to _________ distance and ___________ depth.

Answer 11

overestimate; underestimate (how tall an object is)

Question 12

Why are NVGs green?

Answer 12

The human eye can detect the most differentiating shades in green.

Question 13

What is moonrise?

Answer 13

When the upper edge of the moon’s disk is coincident with the horizon in the east.

Question 14

What is moonset?

Answer 14

When the upper edge of the moon’s disk is coincident with the horizon in the west.

Question 15

What is twilight?

Answer 15

When the upper atmosphere receives direct sunlight and reflects it back to the Earth’s surface to provide natural light.

Question 16

What are the three types of twilight?

Answer 16

Civil, Nautical, and Astronomical

Question 17

What is Civil Twilight?

Answer 17

When the center of the sun is 6 degrees below the horizon. The brightest stars and planets can be seen. (Begins in the morning and ends in the evening).

Question 18

What is Nautical Twilight?

Answer 18

When the center of the sun is 12 degrees below the horizon. Enough light is available to identify the general outline of ground objects. (Begins in the morning and ends in the evening).

Question 19

What is Astronomical Twilight?

Answer 19

When the center of the sun is 18 degrees below the horizon. The sun does not contribute to sky illumination. (Begins in the morning and ends in the evening).

Question 20

The PVS-14s are what type of Ambient Light NVDs?

Answer 20

Generation III

Question 21

What is the range of PVS-14s?

Answer 21

150m (starlight)

300m (moonlight)

Question 22

On the PVS-14s, a blinking red dot in eyepiece signifies what?

Answer 22

Less than 30 minutes of battery life.

Question 23

What are the four adjustments of the PVS-14s?

Answer 23

• Variable gain (brightness)
• Objective lens focus (sharpness of viewed image)
• Diopeter adjustment ring (sharpness of intensifier screen)
• Eye relief

Question 24

What is the range of thermal sights?

Answer 24

Human can be detected at > 3km.
Human can be recognized at > 1km.
Vehicle/tank can be detected at > 8km.
Vehicle/tank can be recognized at > 2.3km

Question 25

What is the range of the laser on the PEQ-15s?

Answer 25

25m

Question 26

What is the range of the IR laser on the PEQ-15s?

Answer 26

> 600m (low), > 2000m (high)

Question 27

What is the range of the IR illuminator?

Answer 27

> 2000m