Camera Crop Factor & Field-of-View Sizer calculates full-frame 35mm equivalent focal lengths and depth-of-field aperture multipliers across different sensor formats, including APS-C, Micro Four Thirds, and 1-inch sensors.

### Crop Factor Principles Full-frame digital sensors (36 × 24 mm) serve as the historical 35mm photography baseline with a 1.0× crop factor: - **Angle of View Equivalency:** Smaller sensors capture a narrower portion of the lens image circle, resulting in an apparent focal length multiplication: $$\text{Equivalent Focal Length} = \text{Actual Focal Length (mm)} \times \text{Crop Factor}$ - **Depth-of-Field (DOF) Equivalency:** While light gathering per unit area remains unchanged at a given f-number, achieving the same framing on a smaller sensor requires standing further back or using a shorter focal length, which increases depth of field: $$\text{Equivalent Aperture (DOF)} = \text{Actual f-number} \times \text{Crop Factor}$

### Common Sensor Multipliers - **Sony / Nikon / Fujifilm APS-C:** 1.5× crop factor - **Canon APS-C:** 1.6× crop factor - **Micro Four Thirds (M4/3):** 2.0× crop factor - **1-Inch Type Sensors:** 2.7× crop factor

### Worked Numeric Example Suppose a photographer mounts a 50mm f/1.8 lens onto a Sony APS-C mirrorless camera (1.5× crop factor): - **35mm Equivalent Focal Length:** $50\text{ mm} \times 1.5 = 75\text{ mm}$. - **Equivalent Depth of Field:** $f/1.8 \times 1.5 = f/2.7$. - **Summary:** The 50mm lens provides the framing of a 75mm portrait lens on full frame, with background blur (depth of field) equivalent to an f/2.7 aperture on full frame.

### Client-Side Processing Note Calculations run purely in client-side JavaScript. No camera gear selections, lens specs, or shot data are sent to external servers.