Exposure · 3 min read
Exposure Value: the method, worked through
Exposure value combines aperture and shutter time on a logarithmic scale.
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Exposure Value
Exposure · 2 inputs
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Exposure01
Exposure Value
Exposure value combines aperture and shutter time on a logarithmic scale.
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ISO-Normalized EV100
Normalizing exposure settings to ISO one hundred makes equivalent settings easier to compare.
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Shutter after Stop Change
Each additional stop doubles exposure time at a fixed aperture and scene.
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Aperture Stop Difference
F-number controls aperture area through a squared relationship, which gives two logarithmic factors.
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ISO Stop Difference
ISO ratios can be expressed as exposure-setting stop differences.
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ND Exposure Time
A neutral-density filter extends the required exposure time by a power-of-two factor.
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ND Stops from Factor
A filter factor describes how much longer exposure must be; its logarithm gives stops.
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ND Optical Density to Stops
Optical density is based on powers of ten, while exposure stops are based on powers of two.
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ND Transmission
Transmission is the fraction of incident light remaining after an ideal filter.
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Equivalent Shutter for ISO
For equivalent rendered brightness at a fixed aperture, shutter time scales inversely with ISO.
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Equivalent Shutter for Aperture
Changing aperture requires a squared shutter-time correction to preserve optical exposure.
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Exposure Compensation Multiplier
A stop-based correction becomes a multiplicative exposure factor.
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Full-Frame Equivalent Focal Length
Crop factor expresses a field-of-view comparison relative to a chosen full-frame reference.
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Horizontal Field of View
A rectilinear lens's horizontal angle of view follows sensor width and focal length.
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Vertical Field of View
Vertical angle of view uses the sensor's shorter dimension for a landscape-oriented frame.
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Sensor Diagonal
The sensor diagonal supports format comparisons and diagonal field-of-view calculations.
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Diagonal Crop Factor
A diagonal crop factor compares the sensor diagonal with a 36 by 24 millimetre reference.
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Subject Width in Frame
A distant-subject approximation estimates the horizontal scene width captured at a given distance.
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Distance for Subject Width
Rearranging the angle-of-view geometry gives a starting camera distance for a desired framing width.
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Hyperfocal Distance
Hyperfocal distance comes from a geometric sharpness criterion set by the circle of confusion.
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Near Depth-of-Field Limit
The near depth-of-field boundary estimates where defocus reaches a chosen blur-circle tolerance.
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Far Depth-of-Field Limit
The far depth-of-field boundary follows the same geometric blur criterion as the near boundary.
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Image Megapixels
Megapixels count the total samples in a rectangular image grid.
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Print Width from Pixels
Pixel dimensions and chosen print density together determine output size.
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Print Height from Pixels
An image's vertical pixel count sets print height at a specified pixels-per-inch density.
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Required Print Pixels
A target physical dimension converts into a minimum whole-pixel requirement.
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Aspect Ratio Width
Aspect ratio determines width from a known height.
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Aspect Ratio Height
A target frame proportion determines height from width.
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Resize Percentage
A resize percentage describes linear scaling, which can be applied equally to both dimensions.
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Crop Retained Pixels
A centred crop with the same aspect ratio reduces both dimensions by the crop factor.
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Video Storage Estimate
An average encoded bitrate turns a running time into an estimated file size.
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Video Duration from Storage
Available decimal gigabytes can be converted into an ideal recording duration.
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Timelapse Frame Count
A frame budget relates a capture duration to the interval between exposures.
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Timelapse Playback Length
A sequence's frame count determines playback length at the chosen frame rate.
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Timelapse Interval
Working backward from a desired clip duration establishes an average capture interval.
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Shutter Angle Exposure Time
Shutter angle expresses exposure time as a fraction of a frame period.
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Shutter Time to Angle
Converting shutter time to angle helps compare motion blur at different frame rates.
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Slow Motion Playback Duration
Playing each captured frame once at a lower frame rate stretches the clip duration.
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Slow Motion Factor
The ratio between capture and playback rates gives the duration multiplier.
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Frames in Clip
A fixed-rate clip maps running time to a whole frame count.
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Uncompressed RGB Image Size
A three-channel pixel buffer has a size determined by dimensions and channel depth.
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Photo Count on Card
Average file size estimates how many images fit within a storage budget.
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Backup Transfer Time
A measured effective transfer rate predicts how long a backup may take.
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Audio PCM File Size
Uncompressed PCM audio storage follows sample count, channel count and bits per sample.
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Focus Magnification
Reproduction ratio compares the physical image on the sensor with the physical subject.
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Extension Tube Magnification Gain
A simple lens model estimates additional magnification from added extension.
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Bellows Exposure Factor
At close focus, an ideal symmetric lens needs increased exposure as extension grows.
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Inverse-Square Light Ratio
A point-like source spreads light over an area that grows with distance squared.
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Flash Guide Number Aperture
A guide number relates direct flash distance to aperture at specified flash and ISO settings.
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Panorama Angular Coverage
A simplified angular panorama model combines a first frame with additional nonoverlapping portions.
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