Forensic Photography Midterm

what are the seven properties of light?

Straight lines containing waves, absorbed, reflected, refracted, dispersion, interference, diffraction

reflected

when light is bounced off a surface and follows the angel of incidence equals the angle of reflection

refracted

light bends when it travels through materials of different density

diffraction

when light travels around an object and illuminates the areas behind the blockage

interference

when light rays work in conjuction with each other or when light rays collide and cancel each other out

dispersion

white light separated into its separate wavelengths due to different degrees of refraction

focal length formula

distance x 2

lowest handheld shutter speed

Inv. FL X (1/focal length)

adjusted FL for cropped sensors

sensor value/focal length

what is the photographers triangle?

shutter speed, aperture, ISO

How many focal points are there for any given distance?

one

what does the diopter adjust do on the camera?

adjusts the viewfinder’s focus to match the photographer’s eye

what are the three sets of pictures that need to be taken at a crime scene?

overview, mid view, close-up

what are the cardinal rules for image composition?

fill the frame, maximize depth of field, film plane parallel

circle of confusion

a concept in photography that describes the size of the blur spot in an image, which affects depth of field and sharpness

histogram

tells you where the data of the image is, dark or light

how many megapixels does a Nikon D200 have?

10.2

what is the sensor crop factor on a D200?

1.5

what is the aperture range on a D200?

f/3.5 to f/36

how many frames per second can a D200 shoot?

five frames per second

who coined the term photography in 1839?

Sir John Herschel

Joseph Niepce in 1826

developed the first permanent photo 8-hour exposure using modified camera obscura and tar solution to fix the image

Louis Daguerre in 1839

developed positive transparency method, the daguerreotype process

daguerreotype process

copper sheets treated with iodine to make them sensitive to light then placed in camera, images were developed using warm mercury vapor

Henry Fox Talbot in 1841

first negative, could produce multiple images from one negative, image was not as sharp as Daguerre but more durable and printed on paper

Alhazen

1011 AD credited with the creation of the camera obscura