Color Temperature & White Balance vs. Exposure Value (EV)
Comparing 2 standards across 13 specifications. 13 key differences identified.
Color Temperature (measured in Kelvin / K, standardized under CIE illuminant standards) defines the spectral chromaticity of light emitted by an idealized black-body radiator. Governing camera white balance, it ranges from warm Candlelight (1800K) and Tungsten Studio (3200K) through Photographic Daylight (5600K / CIE D55) to Overcast Sky (6500K / CIE D65) and Deep Blue Shade (8000K–10000K).
Exposure Value (EV, standardized under ISO 2720) is a logarithmic base-2 scale quantifying combinations of shutter speed and relative aperture that yield identical photographic exposures (EV = log_2(N² / t) at ISO 100). Governs light metering, auto-exposure compensation, dynamic range benchmarks, and the classic 'Sunny 16' outdoor rule.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Tungsten / Halogen Standard
|
3200 K (Standard interior film incandescent / studio tungsten quartz lighting) | — |
|
Commercial Warm White Home Lighting
|
2700 K to 3000 K (Warm ambient household LEDs and Edison bulbs) | — |
|
Direct Sunlight / Flash Standard
|
5500 K to 5600 K (Standard photographic electronic flash and noon direct sunlight) | — |
|
CIE Standard Illuminant D65
|
6504 K (Standard average daylight definition, sRGB / Rec.709 / Display P3 monitor white point) | — |
|
Overcast Sky & Open Shade
|
6500 K to 8000 K (Cool blue-tinted indirect atmospheric skylight) | — |
|
Mired Shift Calculation
|
Mired = 1,000,000 / Kelvin (Used for precise optical color temperature warming/cooling filters) | — |
|
Tint Tint Scale (Green / Magenta)
|
Orthogonal CC tint axis (corrects for fluorescent mercury gas spikes and green LED CRI spikes) | — |
|
Mathematical Formula
|
— | EV = log₂(N² / t) — where N is f-number and t is shutter speed in seconds (at ISO 100) |
|
EV 0 Baseline
|
— | Aperture f/1.0 with a 1.0-second shutter speed at ISO 100 |
|
Sunny 16 Rule (EV 15)
|
— | Bright direct outdoor sunlight = EV 15 (Set aperture to f/16, shutter speed = 1 / ISO speed, e.g. 1/100s at ISO 100) |
|
Typical Real-World EV Benchmarks
|
— | EV -4: Full moon night sky | EV 4: Candlelight interior | EV 7: Typical home interior | EV 12: Overcast day | EV 15: Sunny beach/snow |
|
Auto-Focus Low-Light Rating
|
— | Modern mirrorless AF sensitivity is rated down to EV -6 to EV -9 (operational in near pitch-black darkness) |
|
Dynamic Range Measurement
|
— | Expressed in EV stops (e.g. 14 EV of sensor dynamic range = a 16,384:1 contrast ratio) |