Historical background
While some types of digital cameras trace back their origin to a corresponding type of film still cameras (for example digital single-lens reflex cameras "DSLRs" to film single-lens reflex cameras "SLRs"; digital rangefinders to film rangefinders, etc.), cameras with live preview also derive from electronic (video) TV cameras.
Until 1995 most digital cameras did not have a live preview; most digital single-lens reflex cameras still do not have this feature, as it is fundamentally incompatible with the swinging-mirror single-lens reflex mechanism. The first digital still cameras with an LCD display and live preview were the Casio QV-10 and Ricoh RDC-1 in 1995. The first DSLR to use live view was the fixed-lens Olympus E-10, from 2000; the first interchangeable-lens DSLR to use live view was the Canon EOS 20Da, a special version of the Canon EOS 20D with modifications for astrophotography. The first general-use interchangeable-lens DSLR with live view was the Olympus E-330 of 2006.
Compacts & bridges, the low- and high-end cameras with live preview
Live-preview cameras include two different but not so distinct categories: Bridge digital cameras and Compact digital cameras. Bridge cameras in general are higher-end and more advanced (feature-packed), expensive (higher build quality) and sizable than the compacts.
DSLRs, cameras usually without live preview
When considering the advantages and disadvantages of DSLRs, the comparison is usually made between the best bridge cameras, and the smallest and cheapest DSLRs, so most of what can be said in this respect is treated in the bridge camera article. Check in particular the following sections in that article:
One single fixed but versatile lens
LCDs and EVFs as principal viewfinders
A comparison between compacts and DSLRs would be really a very contrasted one in terms of size, weight, price, capabilities and image quality.
Almost all modern bridges and compact cameras have a movie mode, while no DSLR offered this option until the Nikon D90 released in August 2008. DSLRs have faster performance than other cameras in many areas (for example, start-up time, shutter lag, continuous mode, autofocus); this is not a feature of the DSLR type, but simply improved functionality of more expensive camera models. Consequently DSLRs are more suitable for situations, such as sport or action photography, where a fraction of a second more delay between pressing the shutter release and exposing may result in missing the right instant. Cameras with larger sensors perform better than cameras with smaller sensors in low-light situations, with less optical noise in the image; DSLRs have larger sensors than most digital non-SLR cameras, leading to better images. Non-DSLR digital cameras with large sensors are available; for example the Sony R1, Sigma DP1, and Panasonic Lumix DMC-G1/GH1.
Digital SLRs with live preview
Live-preview functionality is becoming more and more common on digital SLR cameras, and as of mid 2008 almost all new DSLRs have the feature. The following is a partial list of DSLRs with live preview:
Canon 20Da, 40D, 50D, 450D, 500D, 1000D, 1D Mark III, 1Ds Mark III, 5D Mark II, 7D, 1D Mark IV
Leica Digilux 3
Nikon D90, D300, D300s, D700, D5000, D3, D3x
Olympus E-10, E-20, E-330, E-410, E-420, E-450, E-510, E-520, E-620, E-30, E-3
Panasonic DMC-L1, DMC-L10
Sony Alpha A300, A330, A350, A380, A500, and A550
Pentax K20D, K-7, K-x
Samsung GX-20
Live preview in some or all of these cameras is not conventionally generated (the image formed by the lens is either not directly or not continuously projected over the main sensor). Also the live preview in these DSLRs does not typically serve as their principal means of framing and previewing before taking a photograph. (As DSLRs, they have an optical view reflected in the OVF (Optical Viewfinder) for that purpose and the live preview is an additional feature).
While live-preview technology has been advancing, as for March 2008, there are no DSLRs which show a live preview as seamlessly as a fixed-lens camera. The main issues are with slow focus and lack of exposure-priority display. Among the DSLRs that do manage to focus using the standard phase-detection sensor used by DSLRs, none has managed to show 100% frame coverage like conventional digital cameras, thereby removing the key advantage of live preview over optical viewfinders. Additionally, 100% coverage optical viewfinders have recently become more common and affordable with the appearance of the Nikon D300, Olympus E-3 and the Pentax K-7.
Digital camera backs with live preview
Phase One
P20+
P21+
P25+
P30+
P45+
P21
P30
P45
See also
Digital back
Digital photography
Digital single-lens reflex camera
Photography
Still camera
References
^ K. J. Kabza. "Evolution of the Live Preview in Digital Photography". DigitalCameraInfo.com. http://www.digitalcamerainfo.com/content/Evolution-of-the-Live-Preview-in-Digital-Photography-.htm.
^ Digital Camera and Photography: Tips, Information and News Neocamera Blog Blog Archive Live-View Advancement
^ Digital Camera and Photography: Tips, Information and News Neocamera Blog Blog Archive Olympus E-3 - Another 100% Coverage Viewfinder
External links
Evolution of Live Preview in Digital Photography.
Categories: Live-preview digital cameras Digital cameras I am a professional writer from China Manufacturers, which contains a great deal of information about lacoste baseball caps , black velvet band, welcome to visit!
Related Articles -
lacoste baseball caps, black velvet band,
|
