Microscope field of view calculator
Microscope field of view, from the sensor (rectangular field) or from the eyepiece field number (circular field).
Result
665.6 × 665.6 µm
- Calculation
- field = sensor / magnification = 13 312 × 13 312 µm / 20× = 665.6 × 665.6 µm
- Physical sensor
- 13 312 × 13 312 µm
- Pixels read out
- 2048 × 2048 px
- Total optical magnification
- 20×
- Field area
- 443 023 µm²
Calculation, assumptions and sources
OverviewWidth, height or diameter, and area of the field observed through a microscope.
Width, height or diameter, and area of the field observed through a microscope. The rectangular field recorded by the camera is computed from the sensor dimensions in pixels and the pixel size; the circular field seen through the eyepiece, from the field number.
Method & formulascamera field = sensor dimension in pixels × pixel size / total magnification
The first refers the sensor area, a rectangle, back to the specimen; the second, the eyepiece field diaphragm, a disc. The two fields differ: the camera records only a portion inscribed within the visual field.
- Field number
- diameter in millimetres of the field diaphragm, engraved on the eyepiece.
- Effect of magnification
- the field is inversely proportional to magnification. From 20× to 40×, each dimension halves and the area quarters.
Validity domainThe calculation assumes the sensor is fully illuminated.
The calculation assumes the sensor is fully illuminated. An adapter that is too narrow, or a sensor larger than the available image field, produces vignetting, which reduces the usable field. For a measurement, calibrate with a stage micrometer.