Join Ben Long for an in-depth discussion in this video ISO, part of Photography Foundations: Exposure (part 1).
- Shutter speed and aperture are physical mechanisms…that allow you to control how much light…strikes the focal plane,…the place where the image sensor…or piece of film sits in your camera.…In the very early days of photography,…shutter speeds were usually always very long,…usually minutes.…30 seconds was considered a short exposure.…That's why people in portraits in the 19th century…often look so dour.…They weren't necessarily in a foul mood,…they just had to sit very still for a long time.…So, they adopted neutral expressions that were easy to hold.…
One reason that shutter speeds were so long then,…is that the films of the day were not very light sensitive.…It took a long time for them to gather enough light…to create an image.…As film technology and lens technology improved,…and the light gathering speeds of film increased,…shutter speeds could get shorter.…We measure the light gathering speed of a film…using a scale called ISO.…Now, if you come from way back in the film days,…you might've used a scale called ASA.…
Note: This course is designed to work with any digital camera, but it is easier to follow along using a digital SLR or mirrorless camera.
- What is exposure?
- Modern camera anatomy
- Shutter, aperture, and ISO
- Light metering
- Changing shutter speed and aperture
- Exposure compensation
- Light meters
Skill Level Beginner
Learning Natural Light Portrait Photographywith Chris Orwig2h 30m Intermediate
A word about camera brands3m 19s
1. Exposure Fundamentals
2. Camera Anatomy
3. Basic Metering and Exposing
4. Dynamic Range
5. Exposure Compensation
6. Light Meters and Autofocus
Where to go next3m 34s
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