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- D-Lighting
- A function built into several Nikon D-SLRS and into Nikon's Capture NX2 imaging program that allows you to brighten subjects that have been underexposed or enhance the contrast of an overexposed subject.
- D-SLR
- A digital single-lens reflex camera.
- D-Type NIKKOR Lens
- A NIKKOR lens that sends distance information to the microcomputer of a dedicated Nikon camera. D-type lenses can be distinguished by a model name in which the letter D follows the maximum f/number.
- Daylight-Type Film
- A film balanced for proper color rendition when exposed in daylight.
- Definition
- The clarity of detail within a photograph.
- Depth-of-Field Preview
- A feature on advanced SLRs that closes the lens down to the actual taking aperture to enable you to see the picture's depth-of-field.
- Depth of Field
- The zone of acceptable sharpness in front of and behind the subject on which the lens is focused. Depth of field varies according to focal length of the lens, chosen aperture and shooting distance.
- Depth of Focus
- A measurement of the distance behind the lens wherein the film plane will remain sharply in focus. Depth of focus is sometimes referred to as lens-to-film tolerance.
- Diaphragm
- The mechanical device inside a lens that controls the aperture.
- Diffuser
- Any device or substance placed between the central light source and the subject that softens or spreads the light.
- Digital Image
- An image that is represented by discrete numerical values organized in a two-dimensional array. The conversion of images into a digital form is known as digital imaging.
- Digital
- Any device or system in which information is stored or manipulated by on/off impulses.
- Digitization
- Conversion of analog information into digital format so that it can be used by a computer.
- Diopter
- A measure of lens power equal to the reciprocal of the focal length. Eyeglass prescriptions are generally indicated in diopters. For cameras, the diopter is used as the measure of the dioptric power for the image in the viewfinder.
- Dioptric Power
- Apparent image distance through optics such as viewfinders. Rated in diopters. A plus sign is used for positive lenses, a minus sign for negative lenses.
- Disc
- The term used to describe optical storage media (compact disc).
- Disk
- The term used to describe magnetic storage media (floppy disk).
- Dispersion
- A phenomenon in which white light rays deviate by different wavelength amounts resulting in a spectrum. The rainbow created by a prism is the result of dispersion.
- Dodging
- Selectively lightening part of a photo using an image editing program or a mechanical technique in a traditional darkroom.
- Double Exposure
- Two exposures on the same frame. With film cameras, the film is not wound forward after the first exposure. In digital photography, a double exposure is most commonly made by combining two images using an image editing program.
- Download
- A file or other information transferred from a camera, media card, CD, DVD, hard drive or the Internet to a computer or from one piece of computer equipment to another.
- Downloading
- Moving computer data from one location to another. Though the term is normally used to describe the transfer of data from the Internet, it is also used to describe the transfer of photos from a camera's memory card to a computer.
- DPI
- Dots per inch. A measurement of the resolution of a digital photo or digital device, including digital cameras and printers. The higher the number, the greater the resolution.
- DVD
- Digital Video Disc. A type of CD-ROM with greater data storage capacity and access rate. Most commonly used for movies and video data, its high capacity—4.7 gigabytes—makes it ideal for storage and backup of digital files and photographs.
- DX-Coded Film
- Film that features embedded information that allows the camera to automatically set the film's speed.
- DX Format
- Refers to Nikon cameras that feature a 1.5 magnification factor sensor.