Crop Factor Calculator
Full Frame Equivalent
75mm
A 50mm lens on APS-C (1.5x crop) gives the same field of view as a 75mm lens on full frame.
This tool calculates the equivalent focal length when using different sensor sizes. Multiply your lens's focal length by the crop factor to find the full-frame equivalent field of view. It helps photographers understand how lenses behave across different camera systems.
Crop factor is the ratio of a camera sensor's size compared to a full-frame 35mm sensor. It affects the field of view you get from a lens. A crop factor of 1.5x means the sensor is 1.5 times smaller than full frame, resulting in a narrower field of view.
To find the equivalent focal length, multiply the actual focal length by the crop factor. For example, a 50mm lens on a 1.5x crop sensor provides the same field of view as a 75mm lens on full frame. This doesn't change the physical properties of the lens, only the field of view.
Full Frame has a 1.0x crop factor (36×24mm), APS-C Canon uses 1.6x (22.3×14.9mm), APS-C Nikon/Sony uses 1.5x (23.6×15.6mm), Micro Four Thirds uses 2.0x (17.3×13mm), and 1" sensors have approximately 2.7x crop factor. Understanding these helps when comparing lenses across different camera systems.
Crop sensors offer several benefits: more reach for wildlife and sports photography (a 200mm lens becomes 300mm equivalent on 1.5x crop), smaller and lighter camera bodies, lower cost compared to full frame, and increased depth of field at equivalent focal lengths. They're excellent for telephoto work and travel photography.
Full frame sensors excel in low-light photography with better ISO performance, provide wider field of view for landscape and architecture, offer shallower depth of field for portraits, and have larger pixels for better dynamic range. Professional photographers often prefer full frame for studio and commercial work.