Exposure meter with 1–5° measuring angle for precise metering of individual subject areas without approaching the object.
Definition
The Spot Meter is an exposure meter that measures light intensity within a narrow measuring angle of 1-5°. It allows for precise, pinpoint exposure measurements of individual subject areas without needing to approach the object.
Practical Application
Areas of use on set:
- Selective Measurement: Exposure of individual facial areas or object details without interference from ambient light
- Contrast Ratios: Determination of the dynamic range between the brightest and darkest subject areas
- Backlight Shots: Skin tone measurement with strong background light
- Distance Measurement: Exposure determination for inaccessible subjects
Technical Details
Important specifications:
- Measuring angle: 1°-5° depending on the model
- Measuring range: typically -2 to +22.9 EV at ISO 100
- Measurement accuracy: ±0.1 EV under reference conditions
- Calibration to 18% gray reflector or zone system
Practical Tips
- Measure on mid-tone skin areas for portrait shots
- Multiple measurements of different subject areas for contrast analysis
- Compensation required for extreme reflectivity
- Regular calibration for measurement accuracy
Professional Standards
Standard use in film production for:
- Reproducible exposure values for continuity shots
- Precise lighting design in complex setups
- Quality assurance for digital and film recordings
- Documentation of exposure data for post-production
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