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Select Your Camera Body
Choose your camera from the dropdown list. This automatically fills in the correct sensor height (in mm) and photo vertical pixel count for your camera model.
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Measure Your Subject
Enter the real-world height of your subject (e.g., if photographing a bird that's 16 cm tall, enter "16" and select "cm").
For the subject height in pixels: Crop your photo to show just the visible top and bottom edge of the subject, then note the pixel height. Most photo editing software shows pixel dimensions.
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Enter Lens Details
Input your focal length in millimeters (e.g., 300mm). If you used a teleconverter, enter the multiplier (1.4× or 2.0×). Otherwise, leave it at 0.
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Calculate Distance
Click "Calculate Distance" to see how far your subject was from your camera in both meters and feet. The result also shows the effective focal length and magnification used.