I started Lesson 3 (The Lens) today and finished Part 1. Between reading, listening, looking at my camera, and thinking it took about 70 minutes. This part is more technical and therefore harder for me to grasp even though I've studied apertures and f stops before. Today I learned that f stops are fractions and that's why the smaller numbers indicate a larger opening, just like 1/2 is larger than 1/3, and 1/3 is larger than 1/4.
We discussed lenses, lens speed, lens speed vs shutter speed, apertures, f stops, and a little bit about depth of field and focal range. And that was just Part 1!
If you want to hear an example of the lesson CDs, check out the NYI podcasts, such as the one on apertures.
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