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Terms starting with M

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Optics, Lenses & Filters

Macro Lens

A lens corrected for close focusing that reproduces a subject at life size or larger on the sensor.

m = image size / subject size magnification ratio
Genres, Movements & Theory

Macro Photography

Photography at magnifications approaching or exceeding life size, revealing detail invisible to the unaided eye.

m ≥ 1:1 magnification ratio
Focus & Depth of Field

Magnification Ratio

The ratio between the size of a subject and the size of its image on the sensor.

m = image size / subject size ratio
Genres, Movements & Theory

Magnum Photos

A photographers' cooperative founded in 1947 to let its members retain copyright and control over their own work.

Genres, Movements & Theory

Manipulation Standards

The rules defining what processing is permissible in a given field of photography.

Lighting & Flash

Manual Flash

Setting flash output as a fixed fraction of full power, so every frame receives an identical burst.

Power = full / 2ⁿ fraction (1/1, 1/2, 1/4…)
Focus & Depth of Field

Manual Focus

Focusing by turning the lens ring by hand while judging sharpness visually or by scale.

m
Exposure & Metering

Manual Mode

A mode, marked M, in which the photographer sets aperture and shutter speed directly and the camera only advises.

Printing, Display & Output

Mat Board

A card window placed over a print inside a frame, separating it from the glazing and providing visual space.

mm
Printing, Display & Output

Matte Paper

Paper with a non-reflective surface that scatters light diffusely, giving a soft appearance free of glare.

Optics, Lenses & Filters

Mechanical Vignetting

Corner darkening or hard cut-off caused by an accessory physically intruding into the lens's field of view.

Cameras, Formats & Systems

Medium Format

Any format larger than 35 mm but smaller than 4×5 inches, covering film frames from 6×4.5 to 6×17 cm and digital sensors around 44×33 mm.

mm
Sensors & Digital Capture

Megapixel

One million pixels, the standard unit for stating a sensor's resolution.

MP = width × height / 1,000,000 MP
Files, Metadata & Workflow

Metadata

Information stored within or alongside an image file that describes the picture rather than forming part of it.

Files, Metadata & Workflow

Metadata Preset

A saved template of creator, copyright and contact fields applied automatically on import.

Colour & Colour Management

Metamerism

The phenomenon in which two samples match under one light source but differ visibly under another.

Exposure & Metering

Meter Calibration Constant

The factor K in the exposure equation that ties a measured luminance to a recommended camera setting.

N² / t = L × S / K cd·s/m²
Exposure & Metering

Metering Mode

The pattern a camera uses to sample scene brightness when calculating an automatic exposure.

Cameras, Formats & Systems

Micro Four Thirds

An open sensor and mount standard using a 17.3 by 13 millimetre sensor with a 4:3 aspect ratio and a 2× crop factor.

Crop factor = 2.0 mm
Sensors & Digital Capture

Microlens Array

A layer of tiny lenses, one above each photosite, that gathers light which would otherwise fall on the gaps between them.

Focus & Depth of Field

Microprism Collar

A ring of tiny prisms around a focusing screen's centre that shimmers when the image is out of focus and clears when it is sharp.

Exposure & Metering

Middle Grey

The reference tone, reflecting about 18 per cent of the light that strikes it, that every reflected-light meter is calibrated to reproduce.

L* ≈ 50 % reflectance
Composition & Visual Design

Minimalism

A compositional approach built on very few elements, large areas of empty space and simple graphic forms.

Focus & Depth of Field

Minimum Focus Distance

The closest a subject can be to the sensor plane and still be brought into focus.

m