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COT Exam review- Photography Questions and Answers 100% Solved
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COT Exam review- Photography
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COT Exam review- PhotographyEvery camera includes the following elements:
a.) Aperture, shutter, film
b.) Lens, film, diaphragm
c.) Camera body, lens, frame counter
d.) Aperture, camera body, film - answerD.
A good camera lens system will:
a.) Effectively focus on an image at any distance
b.) Have the same focal length for all formats
c.) Be made up of only plus lenses
d.) Produce sharp images on the film plane when properly focused. - answerD.
All films, black & white or color:
a.) Are sensitive to some form of light
b.) Produce equally sharp images
c.) Have similarly sized silver grains
d.) Can be used for ophthalmic photography - answerA.
Film speed refers to: - answerThe film's sensitivity to light. Higher ISO (or speed)
corresponds to greater sensitivity.
Which of the following films is most sensitive?
a.) 25 ISO
b.) 400 ISO
c.) Negative transparency
d.) Print film - answerB.
A slower film will have a (higher/lower) ISO number, (coarser/finer) grains, and
(better/poorer) resolution. - answerLower ISO number, finer grains, and better
resolution.
For the most part, a faster film will have a (poorer/better) image quality and a
(shorter/longer) exposure time. - answerPoorer image quality and shorter exposure
time. Fast film is used to photograph fast things, like sports. They need a short
exposure time in order to freeze motion and the image quality is the trade-off.
The image produced on color slide film is a (positive/negative) image. - answerIt is a
positive image (some people actually call them positives)- you can load a positive into a
projector and display it without any manipulation. It is shot on special slide-film and
processed differently than standard negative film.
, The size of the silver particles in the film emulsion is referred to as the film's:
a.) Density
b.) Grain
c.) Contrast index
d.) Sensitivity - answerb.) Grain. Density refers to the number of silver particles in a
particular spot. Contrast index refers to the number of shades between the darkest and
lightest points on the film. I don't know, or care, what sensitivity is.
The capability of a film to produce variations of highlights and shadows is the: -
answerContrast index. Higher contrast indices generally produce greater contrast.
Lower indices can produce many shades at the expense of looking muddy.
Film exposure is directly related to: - answerTwo things.
1.) The *amount* of light that hits the film plane (you can leave open film in a dark room
for hours without significant exposure)
2.) The *duration* of time that the film is exposed to the light (On a bright sunny day,
exposing the film for more the 1/100 of a second could over expose it.)
Film exposure is controlled by: - answerFour things:
1.) Shutter speed- how long the film is exposed.
2.) Film sensitivity- High ISOs need less light for proper exposure
3.) f-stop (or aperture) - The size of the opening the light is coming through.
4.) Lighting- Adding or taking away light also affects this process.
Each higher f-stop setting and each lower shutter speed increases film exposure by: -
answerA factor of two. This also works in the opposite direction, except it halves instead
of doubles.
A shutter speed of 30 means the film is exposed for: - answer1/30 of a second. For the
purposes of ophthalmic photography, always assume shutter speed is being reported as
1/XX of a second.
At which f-stop setting would the most light be allowed to reach the film?
a.) 0
b.) 1
c.) 8
d.) 32 - answerf-1 would allow the most light to travel in.
An f-stop is the ratio of the lens's focal length to the diameter of the aperture (or actual
opening) (or N= F/D). In a lens with a focal length of 10 and an aperture of 5mm, the f-
stop would be 2. In that same lens, an aperture of 2.5mm (which is smaller) would be an
f-stop of 5.
Larger f-stop numbers correspond to smaller aperture sizes and therefore will result in
less light striking the film plane.
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