||Joint Photographic Experts Group
||A JPEG image is a compressed bitmap image format that was developed in
the early '90s and is available as a recording option in virtually all
digital cameras. Files are appended with ".jpg".
||Designation given to the highest tier of Canon lenses that use advanced
lens materials and designs to optimize image quality.
||A type of glass that refracts all wavelengths of light more equally than
normal glass to reduce Chromatic
||Macro lenses are specially-designed to focus down to extremely short
distances and produce a flat field of focus for copying documents and
such. True macro lenses will focus close enough that the image produced
on 35mm film or a full-frame sensor is life-size. In other words, if you
took a 35mm slide of a dime, the image on the slide would be the same
size as the dime. This is called a 1:1 macro. You’ll see a lot of zoom
lenses with “macro” tacked onto their names. These lenses focus close,
but seldom give more than a 1:4 ratio (the image on the film would ¼ the
size of the dime). Macro lenses are usually f/2.8 and come in 50mm -
200mm fixed focal lengths. Whether 50mm or 200mm, they seldom get closer
than 1:1 but the longer the lens, the farther away you can be from the
subject at 1:1. This is useful for photographing small living things
that get nervous as things get closer.
Multi-Pattern, Evaluative, Honeycomb
A metering mode that measures many parts of the frame and based on a set
of pre-programmed evaluations, balances the exposure to give the best
overall exposure to the scene. This mode performs a "best guess" based
on the pattern detected by the metering and will automatically fire the
flash to fill an under-exposed area or over-expose the background if the
program perceives the subject (it will try to guess the subject based on
the pattern) to be under-exposed. Over the years the "best guess" has
evolved into a remarkably accurate process.
||Equal to 1,048,576 bytes (closest exponent of two to one million).
to denote the capacity of computer-related media such as memory chips or
||Equal to 1,000,000 bits. Most commonly used as a measure of transfer
speed of binary data (Mb/s). Because capacity is measured in megabytes
(8 bits x 1024 x 1024) and speed in bits, a one megabyte file would take
8.38 seconds to transfer from a camera to a computer at 1 Mb/s.
||A class of cameras that use much larger film or sensors than cameras
based on 35mm film cameras. Their exceptional image quality comes at a
price that mostly limits their use to businesses and working
||A camera or lens that is focused manually.
Not autofocus. (Yup, it's just that simple!)
||Compact camera with a large sensor and
interchangeable lenses capable of
DSLR quality images in a small package.
||Mirror Lock Up
|| A feature on some SLRs
that allows the reflex mirror to be locked into it's shooting position.
This feature is used in long telephoto and macro work to eliminate the
vibration caused by the slap of the mirror as it flips up out of the way
when the shutter is released. Many DSLRs
with this feature will include MLU in the 2 second self-timer function
so the mirror is flipped up and the camera waits 2 seconds before
releasing the shutter to allow the vibration to die down.
||New E-mount eXperience
camera series that features extremely compact bodies with large
APS-C sensors. Unlike the Alpha series, they do not feature
in-body stabilization and rely on lens-based stabilization in
optics made for the new E-Mount.
||Out Of Focus
||Not in focus. A soft image may be soft for a number of reasons. OOF is a
common reason. Also refers to areas in an image that are intentionally
not in focus.
||Sigma term for their lens-based image-stabilization technology
||Camera viewfinder that used lenses, either a separate assembly
synchronized with the camera's lens or directly through the main lens
via a mirror.
||An aspect of Chromatic
Aberration that appears as a purple fringe most often on the
edges of high contrast areas between blue sky and darker objects like
tree branches of the edges of buildings.
||Not an acronym. It refers to the unprocessed image format available in
higher-end digital cameras. Sort of a digital "negative". The RAW format
contains the basic image data that the sensor records before it is
processed by the camera into a JPEG.
A RAW file can be manipulated after-the-fact for exposure compensation,
white-balance, noise-reduction, sharpness, contrast, color settings and
almost any other adjustment options that the camera offers. Because each
camera maker uses it's own RAW format, applying the adjustments requires
either the proprietary software from the camera manufacturer, a
dedicated RAW processing package like Bibble or a higher-end editing
program like the ones available from Adobe or Corel. RAW is used by
professional photographers where critical adjustments may be needed in
post-production and over-used by general photographers "because the pros
use it". (Though generally factual, that last part was a bit of editorializing.)
||A lens that moves the rear element group to focus. Usually found in a
larger telephoto where moving the huge front element to focus would be
||Range Finder (e.g. Leica's M8)
||A camera that uses a dual image parallax rangefinder system to focus.
||A camera setting in an autofocus camera that allows the shutter to be
released even if the focusing system does not confirm that focus has