- Количество слайдов: 18
D 40 ISO Experiment
Your Task • Shooting on Auto-No Flash take exposures of the same subject changing only the ISO setting – HI+1 – 1600 – 800 – 400 – 200 • OBSERVE the difference images on a computer, REFLECT on results
Pick a scene
Don’t move around
Think about stabilizing your camera
Record your results
Regroup to discuss
Film & the Exposure Triangle
Types of Film– ISO/ASA • The International Standards Organization ISO or American Standards Association “ASA” created a designated a number for every type of film that measures the film’s sensitivity to light • Each number is double or half as sensitive as the next available film – Ex: 25, 50, 100, 200…
Slow film= 25 -50 ISO/ASA + Smooth texture + Captures maximum amount of detail + Useful for still life photos and non-moving subjects - Tripod needed & plenty of light - Longer exposures
Fast film= 200 -3200 ISO/ASA + Shooting in low light situations + Allows for handholding the camera + Shorter exposures/Fast shutter speeds - Coarse detail - Grainy texture
Medium film= 100 ISO/ASA + Good for portraits + Medium grain + Med exposures -Tripod will still be needed in med-low light situations
The exposure triangle ✔ ISO changes the graininess of a shot & overall exposure time • Aperture (also changes the depth of field) • Shutter speed (also impacts how motion is captured)
Which type of film did they use? ?
Which type of film did they use?
Which type of film did they use? ? Edward Weston, Pepper, 1930.
In short! ISO/ASA: • Higher number= Higher grain • Lower number= Lower sensitivity to light (longer exps)
ISO conclusions • Use ISO knowledge to buy film for your specific purpose • To limit noise add light or sacrifice high shutter speed settings • Consider experimenting with ISO settings on your digital cams or just use auto