WEEK 2

Question 1

what is focal length?

Answer 1

what is a lens’s feild of view

Question 2

“refers to placing people behind rather than blocking them”

Answer 2

z axis

Question 3

________ lenses reveal more of what is infront of the camera

Answer 3

wide angle

Question 4

_________ reveal less of what is infront of the camera

Answer 4

telephoto

Question 5

“when light bends inward to a single point”

Answer 5

refractions

Question 6

wider lenses ___________________

Answer 6

seperate background and foreground

Question 7

narrow lenses __________

Answer 7

compress

Question 8

3 points of the exposure triangle!

Answer 8

aperture, shutter speed, iso

Question 9

_________is the amount of light coming through a lens, measured as f-stops

Answer 9

aperture/iris

Question 10

Each time we half or double light it’s called a _______

Answer 10

a stop! (f/1.4, f/2, f/5.6, f/8, f/16, f/24)

*the smaller the number the wider the lens

Question 11

when you close the iris you are letting ________ light in

Answer 11

LESS

Question 12

what are transmission stops?

Answer 12

T-stops are a measurement of how much light is actually going through the lens at any given f-stop

Question 13

measured in degrees or fractions, amount of light coming through a lens per frame

Answer 13

shutter!

Question 14

Creates motion blur
Slow shutter = 1/15 (makes it blurry)
Medium shutter = 1/60 (less blurry)
Fast shutter = 1/2000 (still picture)

Answer 14

shutter info

Question 15

based on distance, measured out on focal plane (from camera to subject)

Answer 15

focus!

*Measure distance to talent’s eye
Adjust lens to correct distance
Mark position on follow focus rings

Question 16

distance between nearest and farthest objects in focus

Answer 16

depth of feild (DOF)!

*Aperture and focal length affect DOF
Wider lenses have larger DOF, longer lenses have shallower DOF
Shallower DOF means aperture is too big (f/4), too deep DOF means aperture is too small (f/22)

Question 17

wider lenes have ________ depth of feild

Answer 17

larger

Question 18

longer lenses have ______ depth of feild

Answer 18

shallower

Question 19

Why do we zoom to focus?

Answer 19

By zooming to focus, we achieve shallowest DOF, allowing operator to be critical when determining focus

Question 20

Shallower DOF means aperture is too __________(f/4),

Answer 20

big

Question 21

too deep DOF means aperture is too ________(f/22)

Answer 21

small

Question 22

TYPES OF LENSES

-Have focus and iris only
-Having fewer glass elements means having a sharper image

Answer 22

Prime lenses: fixed focal length

Question 23

TYPES OF LENSES

• Use combination of 1 concave and 2 convex lenses (on equal plane) to manipulate field of view
• Moving concave lens shifts field of view from wide to narrow

-Sometimes a fourth “focusing lens” is used to adjust final refraction to achieve focus

Answer 23

Zoom lenses: variable focal length

Question 24

• canon photography zoom lens
• focus changes as you change focal length

Answer 24

varifocal

Question 25

• canon video zoom lens
• focus stays consistent as you change focal length

Answer 25

parifocal

Question 26

• variable focal length
• wide range from wide photo
• may include OIS
• manual and servo
• may include a telephoto
  extender
  -fast

Answer 26

zoom lens advantages

Question 27

-heavy
- can lose backfocus
- softer image
- more expensive

Answer 27

zoom lens disadvantages