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URL:https://www.learndesk.us/class/6703471816343552/lesson/c0f31c64813afe362756b7012f9b47ed?ref=outlook-calendar
SUMMARY:Cinematography: Understanding Focal Lengths
DTSTART;TZID=America/Los_Angeles:20260519T190000
DTEND;TZID=America/Los_Angeles:20260519T200000
LOCATION:https://www.learndesk.us/class/6703471816343552/lesson/c0f31c64813afe362756b7012f9b47ed?ref=outlook-calendar
DESCRIPTION: 

Focal lengths
What is a focal length

The focal length of the lens - expressed in MM - affects first a foremost the field of view of the camera. Essentially the smaller the number, the wider the field of view. So an 85mm lens is quite narrower than an 18mm lens. The larger the number, the narrower the field of view. 
But this doesn't scale in a linear way - meaning, if you swap from a 14mm to a 25mm lens, you will see a pretty big difference a change of 81.7° to 51.7° - a 30° difference in the field of view. Whereas if you swap from an 85mm lens to a 100mm lens there is only a 2.4° difference (from 16.2° to 13.8°). all fields of view are relative to a Super 35mm Sensor like the Alexa.
This is one of the most essential ways you can express different visual themes in a project - using focal lengths. Here is an awesome tool you can use to experiment with how different sensors affect the overall field of view with your chosen focal lengths.

Sensor size

Something important to know...

https://www.learndesk.us/class/6703471816343552/lesson/c0f31c64813afe362756b7012f9b47ed?ref=outlook-calendar
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