Photography Flashcards
(20 cards)
1
Q
1 which colour light is absorbed first: a green b blue c red d all the same
A
c
2
Q
what term is given to the reflective effect of suspended minerals, silt etc in weakening the light intensity: a attenuation b absorption c scattering d refraction
A
c
3
Q
3 a camera that allows viewing through the lens prior to taking the photograph is called: a viewfinder camera b TLR camera c SLR camera d SDP camera
A
c
4
Q
4. lenses with short focal lengths are called: a normal b telephoto c inverse d wide angle
A
d
5
Q
5 the distance between the nearest and farthest points in focus for any particular lens setting is called: a the F stop b the depth of field c the focal length d the focal point
A
b
6
Q
6 depth of field increases when: a the F number is increased b the subject to camera distance is increased c the lens focal length is decreased d all of the above
A
d
7
Q
7 the F number on a camera is calculated by:
a dividing the focal length by the diameter of
the aperture
b multiplying the focal length by the diameter
of the aperture
c adding the camera to subject distance to the
depth of field
d dividing the focal length by the lens size
A
a
8
Q
8. how much larger or smaller is the image on 70 mm when compared with 35 mm film: a two times larger b four times larger c two times smaller d four times smaller
A
b
9
Q
9 what term is used to express the light output of a strobe or flash unit: a wattage b strobe number c guide number c d lux
A
c
10
Q
10 when making a photomosaic of an nodal weld what overlap on individual frames should be used: a 30 - 40 % b 40 - 50 % c 60 - 70 % d 70 - 80 %
A
b
11
Q
11. what F stops would you bracket around when taking a stand-off photograph from 1 m underwater: a F 8 b F 11 c F 16 d F 22
A
a
12
Q
- what is the essential ingredient of a good inspection photograph:
a a label noting the subject
b a scale with either imperial or metric markings
c holding the camera in a horizontal position
d ensuring the flash is orientated correctly
A
b
13
Q
13 what is the most important reason for filling out logs during photography:
a to save time during the writing of the report
b as a record of photographs having been taken
c to record the basic details of the film, such as
subject, diver and date
d to count the number of exposures used
A
b
14
Q
14 the speed of photographic emulsion is affected by: a the size of the film b size of the aperature c amount of light available d none of the above
A
C
15
Q
15 as light travels through water: a the spectrum changes b it gains in intensity c the beam is not affected by scattering d it is not affected at the air water interface
A
a
16
Q
16 scatter is caused by: a light reflecting on particles in the water b light exciting the molecules c the ASA of the film d moving the camera
A
a
17
Q
17 a lens for underwater or surface use: a 35 - 70 mm b 16 - 35 mm c 35 - 125 mm d 28 - 35 mm
A
d
18
Q
18 light reflects through water: a towards the object b away from the object c does not change d from the object
A
b
19
Q
19 as sunlight enters the water it: a refracts towards the normal b refracts away from the normal c carries straight on its original path d is all reflected
A
a
20
Q
20 the size of 35 mm film is: a measured diagonally b width of film c size of aperture d number of exposures
A
b
