Certified Professional Photographer – Q&A
Name 2 ways you can decrease depth of field ✔️Ans - 1) Use a longer
lens; 2) Move closer to the subject
A lens set at f/4 admits how much more/less light than one set at f/2.8?
✔️Ans - Half as much light
When buying a lens hood, you should get it in what size relative to the lens?
✔️Ans - It should match the focal length. Too wide and it's inefficient; too
narrow and it will vignette; most likely to occur with wide angle of 28mm and
below.
A color image with smooth gradiations requires at least what bit depth?
✔️Ans - 24 bits per pixel (8 per color), which gives 16,777,216 colors
When the size of the aperture is decreased, it is said to be what? ✔️Ans -
stopped down
A general purpose lens will provide an f-stop range of up to how many?
✔️Ans - 8 stops
Panning does what? ✔️Ans - Keeps a moving subject sharp while blurring
the background
What is an element and where is it found? ✔️Ans - A simple lens with two
curved sides or one curved and one flat side; found in a compound lens.
What two controls adjust the amount of light that reaches the sensor?
✔️Ans - Aperture and shutter
What do TTL systems react to? ✔️Ans - The amount of light reflected
back from the subject during exposure.
Convex lenses cause light rays to do what? ✔️Ans - bend toward each
other and converge at the focal point.
, In short lighting, where is the main light placed? ✔️Ans - To strike the
side of the face away from the camera.
Why does a short lens create wide-angle distortion ✔️Ans - Because you
can move in close to the subject
What does ISO stand for? ✔️Ans - International Organization for
Standardization
Aperture controls what? ✔️Ans - The brightness of the light that reaches
the sensor
What is the suggested shutter speed to stop action of a child running parallel
to the film plan, about 25 feet from the camera? ✔️Ans - 1/250th
Perspective is affected by what? ✔️Ans - lens-to-subject distance
What is a BYTE? ✔️Ans - An 8-BIT sequence that represents 256
possibilities - black & white & 254 shades of grey. The size of a file is the
number of bytes it contains.
Most modern lenses are based on this kind of lens ✔️Ans - Convex
Sharpness from near to far is controlled by what? ✔️Ans - Aperture
The quantity of light that reaches your sensor is controlled by what?
✔️Ans - Shutter speed & aperture
The term to describe the combination of aperture and shutter speed that can
be changed by moving them in opposite directions ✔️Ans - Reciprocal
relationship
Most lenses are sharpest closed down to how many stops from the widest?
✔️Ans - 1 or 2
Name two ways you can increase depth of field (other than changing
aperture) ✔️Ans - 1) Use a shorter focal length; 2) Move farther away
from the subject
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