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Wikipedia About DSLR

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Portal: Large_format_camera_lens.png A digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that uses a mechanical mirror system and pentaprism to direct light from the lens to an optical viewfinder on the back of the camera.

The basic operation of a DSLR is as follows: for viewing purposes, the mirror reflects the light coming through the attached lens upwards at a 90 degree angle. It is then reflected twice by the pentaprism, rectifying it for the photographer's eye. During exposure, the mirror assembly swings upward, the aperture narrows (if set smaller than wide open), and a shutter opens, allowing the lens to project light onto the image sensor. A second shutter then covers the sensor, marking the end of the exposure, and the mirror lowers while the shutter resets. The period that the mirror is flipped up is referred to as "viewfinder blackout". A fast-acting mirror and shutter is preferred so as to not delay an action photo.

All of this happens automatically over a period of milliseconds. Fast cameras do this upwards of 10 times a second.

DSLRs are often preferred by professional still photographers because they allow an accurate preview of framing close to the moment of exposure, and because DSLRs allow the user to choose from a variety of interchangeable lenses. Most DSLRs also have a function that allows accurate preview of depth of field.

Many professionals also prefer DSLRs for their larger sensors compared to most compact digitals. DSLRs have sensors which are generally closer in size to the traditional film formats that many current professionals started out using. These large sensors allow for similar depths of field and picture angle to film formats.

The term DSLR generally refers to cameras that resemble 35 mm format cameras, although some medium format cameras are technically DSLRs.

Brief difference between a DSLR and a digital point and shoot camera

The reflex design scheme is a major difference between a DSLR and an ordinary digital point and shoot camera, which typically exposes the sensor constantly to the light projected by the lens, allowing the camera's screen to be used as an electronic viewfinder.

In contrast, the mirror arrangement in a DSLR usually precludes the ability to view the scene on the liquid crystal display (LCD) before the photograph is taken. However, many newer DSLR models feature live preview, allowing the LCD to be used as a viewfinder in the same way as a normal digicam, although with certain limitations and with the optical viewfinder disabled.

DSLR design principles

A camera based on the single-lens reflex (SLR) principle uses a mirror to show in a viewfinder the image that will be captured. The cross-section (side-view) of the optical components of an SLR shows how the light passes through the lens assembly (1), is reflected into the pentaprism by the reflex mirror (which must be at an exact 45 degree angle) (2) and is projected on the matte focusing screen (5). Via a condensing lens (6) and internal reflections in the roof pentaprism (7) the image is projected through the eyepiece (8) to the photographer's eye. Focusing is either automatic, activated by pressing half-way on the shutter release or a dedicated AF button, as is mainly the case with an autofocusing film SLR; or manual, where the photographer manually focuses the lens by turning a lens ring on the lens barrel. When an image is photographed, the mirror swings upwards in the direction of the arrow, the focal-plane shutter (3) opens, and the image is projected and captured on the sensor (4), after which actions, the shutter closes, the mirror returns to a critical 45 degree angle, and the diaphragm reopens and the built in drive mechanism retensions the shutter for the next exposure. There is often a ring of soft material around the focusing screen, which helps to both cushion the impact of the mirror slapping up and help seal the mirror box from light entering through the eye piece. Some high end cameras incorporate a shutter into the eyepiece to further eliminate light that may enter there during long exposures.

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News about Dslr

First Look: Gigapan Epic 100, The Panorama Robot

WiredGigapan makes hefty boxes which take your compact camera (or small DSLR) and, using stepper-motors, take a whole bunch of perfectly aligned snaps which can later be stitched together to make a huge, detailed gigapixel image — hence the name. The ... http://www.wired.com/gadgetlab/2009/05/first-look-gigapan-ep...

Mother's Day Tech: Gifts for the geeky mom

ZDNet BlogsFor the more advanced mom, the new Sony CyberShot DSC-HX1 digital camera is definitely a step up from a normal point-and-shoot, but not quite at the DSLR level. It’s easy to use, and is the world’s first digital still camera with “Sweep Panorama ... http://blogs.zdnet.com/gadgetreviews/?p=3916

Stuff.tv's weekend gadget deals – cameras

Stuff.tvBest DSLR camera deal – Canon EOS 1000D with EF-18-55mm lens, £342.59 DSLR cameras can soar up into the thousands of pounds territory, but luckily there are still some options out there that are going to give you top DSLR quality without hurting ... http://stuff.tv/News/Stufftvs-weekend-gadget-deals-cameras/1...

Browse Cameras Reviews

Mac Central ... successor to the popular EOS 30D digital single-lens reflex camera. Experienced photographers will enjoy the EOS 40D's intuitive design and easy-to-use software interface, not to mention the great image quality. It's not perfect, but it's a DSLR to ... http://www.macworld.com/browse.html?type=3&cat=216

Arty E-30

Star OnlineFunky ­filters and modes give an interesting twist to the Olympus E-30 DSLR. THERE was a time when DSLRs were meant for professional and serious amateur use, while compact cameras were meant for parties and casual users. The main difference was that ... http://www.star-techcentral.com/reviews/story.asp?file=/2009...

Search results for Dslr

Digital SLR camera buying guide - CNET Reviews

CNET gives you the lowdown on what to look for in a digital SLR camera.http://reviews.cnet.com/dslr-buying-guide/

DSLR Focus

by Chris Venter. DSRL Focus, the original DSLR Focus Assist software is now even better with the release of Version 3.0 available now. NEWSFLASH: 350D/Rebel XT, 20D and 20Da now ... http://www.dslrfocus.com/

DSLR definition of DSLR in the Free Online Encyclopedia.

DSLR (D igital S ingle L ens R eflex) A digital still image camera that uses a single lens reflex (SLR) mechanism. Most professional cameras have always been single lens reflex ... http://encyclopedia2.thefreedictionary.com/DSLR

DSLR Cameras | Sony | SonyStyle USA

Shop 900 (24.6 megapixels) Introducing our new flagship model, the 35mm equivalent for serious photographers. Starting at $2,699.99http://www.sonystyle.com/webapp/wcs/stores/servlet/CategoryD...

Amazon.com: Sony Alpha DSLRA300K 10.2MP Digital SLR Camera with Super ...

This item: Sony Alpha DSLRA300K 10.2MP Digital SLR Camera with Super SteadyShot Image Stabilization with DT 18-70mm f/3.5-5.6 Zoom Lens ; Sony ACC-AMFM11 Accessory Kit (Includes NP ... http://www.amazon.com/Sony-DSLRA300K-Digital-SteadyShot-Stab...

Wikipedia results for Dslr

Digital single-lens reflex camera - Wikipedia, the free encyclopedia

A digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that uses a mechanical mirror system and pentaprism to direct light from the lens to an optical ... http://en.wikipedia.org/wiki/Dslr

Single-lens reflex camera - Wikipedia, the free encyclopedia

It appears inevitable that the Digital Single Lens Reflex camera design will eclipse film SLR's design in convenience, sales and popularity. These cameras are currently the ... http://en.wikipedia.org/wiki/Single-lens_reflex_camera

Canon EOS 400D - Wikipedia, the free encyclopedia

The EOS 400D, called Digital Rebel XTi in North America and EOS Kiss Digital X in Japan, [2] is an entry-level digital single-lens reflex camera introduced by Canon August 24, 2006 ... http://en.wikipedia.org/wiki/Canon_EOS_400D

Lenses for SLR and DSLR cameras - Wikipedia, the free encyclopedia

This article is about photographic lenses for single-lens reflex film cameras (SLRs) and digital single-lens reflex cameras (DSLRs). Furthermore, the emphasis is on modern lenses ... http://en.wikipedia.org/wiki/Lenses_for_SLR_and_DSLR_cameras

Full-frame digital SLR - Wikipedia, the free encyclopedia

A full-frame digital SLR is a digital single-lens reflex camera (DSLR) fitted with an image sensor that is the same size as a 35 mm (36x24 mm) film frame.http://en.wikipedia.org/wiki/Full_frame_DSLR
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Videos found for DSLR

Canon EOS 450D Digital Rebel XSi Ca...

Canon EOS 450D Digital Rebel XSi Camera - New EOS 450 DSLRCanon EOS 450D Digital Camera Rebel XSi - New EOS 450 DSLR The Canon EOS 450D blends uncompromising performance with ease of use in a lightweight, ergonomic body. Capture your...Flash - Video

Nikon D3x DSLR: First Look Reviews

Nikon D3x DSLR: First Look ReviewsNikon launch the D3x, a flagship DLSR camera with a whopping resolution of 24.5 megapixels! So is this Nikon's best camera yet? Katie Scott went to the launch to find out.Flash - Video

DSLR Tips: Night Photography

DSLR Tips: Night PhotographyFull guide at: http://www.dslrtips.com/workshops/How_to_take_photos_at_night/manual_long_exposure.shtml How to take successful photos at night, by Gordon Laing, Editor of...Flash - Video

The High-Spec Dslr For Video Lovers

The High-Spec Dslr For Video LoversThe world's largest digital camera maker Canon says the 'controversial' step of adding movie... 12/2008 ReutersVideo - Video

Nikon D90 DSLR Camera

Nikon D90 DSLR CameraToday, Chris Hardwick gets all foamy about the Nikon D90 DSLR camera, and gives it a good once-over to see if it's worth taking on vacation, or wherever else you might want to...Flash - Video
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