Each post in this series builds on information discussed in previous posts. See the Photography for Beginners page on the menu for links to all the posts.
Part 9: Exposure Metering
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In this post we’re going to discuss lens focal length and related topics.
What is focal length?
There is a bunch of technical specifications and math involved in what focal length actually measures. It has to do how light is bent by a lens and the distance from the plane of the film or sensor to the point of infinity focus. Or something like that. Thankfully we don’t need to actually understand the physics in order to know how focal length applies to photography in practical ways.
Focal length is measured in millimeters, and what you do need to understand is what the numbers mean in general terms. A short focal length (low number) provides a wide-angle of view. A long focal length (high number) provides magnification and a narrow angle of view.
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