the three elements of exposure understanding f/stop, shutter speed, and iso
TRANSCRIPT
What is exposure?
• Definition 1: the amount of light it takes to produce a printable image on the negative (film)
• Definition 2: the actual taking of the photo
Exposure Factor 1: ISO
• International Standard Organization
• Measures film speed
• What is film speed?
Film Speed, cont’d
• The higher the ISO number, the more sensitive the film is to light.
ISO 50 ISO 100 ISO 200 ISO 400 ISO 800 ISO 1600
ISO 3200
ISO 6400
Slow Medium Medium Fast Fast Ultrafast Ultrafast Ultrafast
Needs more light
*this is the film speed we use
Needs less light
Film Speed, cont’d
• Film speed also determines grain.
ISO 50 ISO 100 ISO 200 ISO 400 ISO 800 ISO 1600
ISO 3200
ISO 6400
Slow Medium Medium Fast Fast Ultrafast Ultrafast Ultrafast
Fine grain
Fine grain
Fine grain
Medium grain
Medium grain
Coarse grain
Coarse grain
Coarse grain