Live Preview Only Cameras
Live-preview-only cameras, that is cameras without an optical viewfinder, include four different categories: Compact digital cameras, bridge digital cameras, and the newer mirrorless interchangeable lens cameras and Sony SLT cameras.
Bridge cameras in general are higher-end, that is they contain more advanced features, better build quality, larger size, and are more expensive than compacts, but retain a small digital sensor. Mirrorless cameras feature a larger sensor and interchangeable lenses, like DSLRs, but sacrifice the SLR mirror mechanism and viewfinder to save size and cost, and hence only offer live preview.
The SLT, developed by Sony, uses a mirror similar to that found in a DSLR. However, unlike the moving and fully reflective mirror of DSLRs, the SLT mirror is fixed and semi-reflective. New Zealand-based British photographer Gordon Laing describes the technology:
" fixed semi-reflective mirror allows around 70% of the light to pass through to the sensor for full-time live view composition, but reflects the remaining 30% or so to the phase change AF system, allowing quick and continuous autofocusing in Live View and movie modes. 30% is however too little for a traditional optical viewfinder, so Sony doesn't bother, instead using the main sensor to deliver a live image to an electronic viewfinder in addition to the main rear screen for composition."
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Famous quotes containing the words live, preview and/or cameras:
“If I had to live my life over again I would live it as I have lived it; I neither regret the past nor fear the future.”
—Michel de Montaigne (1533–1592)
“For parents, the terrible twos are a psychological preview of puberty.... At the age of two or three, children eat only bananas and refuse to get a haircut. Ten years later, they eat only bananas and refuse to get a haircut.”
—Carin Rubenstein (20th century)
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—Paul Johnson (b. 1928)