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A Crop Factor Calculator is a tool used in photography and agriculture to determine how a given sensor size or crop coefficient affects field measurements. In photography, it helps compare different camera sensors by calculating the crop factor, which influences focal length and field of view. In agriculture, it assists in estimating water needs for crops using the crop coefficient and reference evapotranspiration.
Formula of Crop Factor Calculator
To calculate the crop factor in photography:
Crop Factor = Diagonal of Full Frame Sensor / Diagonal of Camera Sensor
Where:
- The diagonal of a full-frame sensor is typically 43.3 mm.
- The camera sensor's diagonal varies based on the camera model and format.
To calculate the crop factor in agriculture:
Crop Factor (CF) = Kc × ETo
Where:
- CF is the crop factor (in mm/day or in the same units as ETo).
- Kc is the crop coefficient, which varies by crop type and growth stage.
- ETo is the reference evapotranspiration, representing water loss from a reference grass surface.
Commonly Searched Crop Factors
| Crop Type | Growth Stage | Crop Coefficient (Kc) |
|---|---|---|
| Wheat | Early | 0.3 - 0.5 |
| Corn | Mid | 1.1 - 1.2 |
| Rice | Late | 0.9 - 1.0 |
| Grapes | Mid | 0.6 - 0.8 |
| Soybeans | Early | 0.4 - 0.6 |
Example of Crop Factor Calculator
If the reference evapotranspiration (ETo) is 5.0 mm/day and the crop coefficient (Kc) for corn at the mid-growth stage is 1.2, then:
Crop Factor = 1.2 × 5.0 = 6.0 mm/day
This means that the crop requires 6.0 mm of water per day under the given conditions.
Most Common FAQs
The crop factor alters the field of view of a lens. A higher crop factor results in a narrower field of view, effectively increasing the focal length.
The crop coefficient helps determine water requirements for different crops, aiding in efficient irrigation planning.
No, the crop factor is fixed for a given sensor size. However, using different lenses can affect the effective field of view.