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Full Frame Equivalent Formula:
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Full Frame Equivalent (EFL) is a standardized way to express the angle of view of a lens when used with different sensor sizes. It converts the actual focal length of a lens to what focal length would be needed on a full-frame camera to achieve the same field of view.
The calculator uses the full frame equivalent formula:
Where:
Explanation: The crop factor represents how much smaller the sensor is compared to a full-frame (35mm) sensor. Common crop factors include 1.5× for APS-C Nikon/Sony, 1.6× for APS-C Canon, and 2× for Micro Four Thirds.
Details: Understanding full frame equivalent is crucial for photographers working with multiple camera systems, as it allows for consistent composition planning and lens selection across different sensor sizes.
Tips: Enter the actual focal length of your lens in millimeters and the crop factor of your camera. Both values must be positive numbers (focal length > 0, crop factor ≥ 1).
Q1: Why use full frame equivalent?
A: It provides a standardized way to compare lenses across different camera systems and sensor sizes, making it easier to understand the actual field of view.
Q2: Does full frame equivalent affect aperture?
A: No, the full frame equivalent only applies to focal length and field of view. The aperture value remains the same regardless of sensor size.
Q3: What are common crop factors?
A: Common crop factors include 1.5× for Nikon/Sony APS-C, 1.6× for Canon APS-C, 2× for Micro Four Thirds, and 2.7× for many compact cameras.
Q4: Does full frame equivalent affect depth of field?
A: While the equivalent focal length doesn't directly change depth of field, using different sensor sizes with equivalent focal lengths will result in different depth of field characteristics when maintaining the same composition.
Q5: Is full frame equivalent only for photography?
A: No, the concept applies equally to both photography and videography, as it relates to the field of view which is important in both disciplines.