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Digital SLR Cameras
DSLRs are currently produced by Canon , Leica , Nikon , Olympus , Panasonic , Pentax , Samsung , Sigma, and Sony. Hasselblad  and Mamiya  also produce expensive, professional medium-format  DSLRs.

As of 2008 , DSLR sales are dominated by Canon's and Nikon's offerings. For 2007, Canon edged out Nikon with 41% of worldwide sales to the latter's 40%, followed by Sony and Olympus each with approximately 6% market share . In the Japanese domestic market, Nikon captured 43.3% to Canon's 39.9%, with Pentax a distant third at 6.3%. The duopoly  of Canon and Nikon is sometimes disparagingly referred as "Canikon" or "Nikanon" in online forums  to suggest a lack of product differentiation  and innovation by these manufacturers.





                                    Top 10 Digital SLR Cameras
Canon EOS 40D 10.1MP Digital SLR Camera with EF 28-135mm f/3.5-5.6 IS USM Standard Zoom Lens

Canon Digital Rebel XSi 12MP Digital SLR Camera with EF-S 18-55mm f/3.5-5.6 IS Lens (Black)

Nikon D60 10.2MP Digital SLR Camera with 18-55mm f/3.5-5.6G AF-S DX VR Nikkor Zoom Lens

Nikon D40 6.1MP Digital SLR Camera Kit with 18-55mm f/3.5-5.6G ED II AF-S DX Zoom-Nikkor Lens
Nikon D300 DX 12.3MP Digital SLR Camera with 18-200mm f/3.5-5.6G ED-IF AF-S VR DX Nikkor Zoom Lens
Nikon D80 10.2MP Digital SLR Camera Kit with 18-55mm ED AF-S DX Zoom-Nikkor Lens
Olympus Evolt E-510 10MP Digital SLR Camera with CCD Shift Image Stabilization and 14-42mm f/3.5-5.6 and 40-150mm f/4.0-5.6 Zuiko Lenses
Canon Digital Rebel XTi 10.1MP Digital SLR Camera with EF-S 18-55mm f/3.5-5.6 Lens (Black)
Pentax K200D 10.2MP Digital SLR Camera with Shake Reduction 18-55mm f/3.5-5.6 Lens
Canon EOS 5D 12.8 MP Digital SLR Camera with EF 24-105mm f/4 L IS USM Lens
Top 5 Reasons to Buy a Digital SLR Camera

Sensor size
One of the biggest differences between dSLRs and compact shooters is the size of the image sensor. You probably won't see it unless you decide to tear apart your digicams, but the sensor in consumer cameras is typically the size of your pinky, while that in a digital SLR camera is many times larger. Rule of thumb: A larger sensor translates to better image quality especially in terms of noise and dynamic range. Putting that into perspective, a 6-megapixel dSLR would likely produce better pictures than a 10-megapixel consumer compact digicam. So cut out that megapixel chasing, will you?


Going manual
Unlike the snapshot cameras, dSLRs have a wealth of controls that scream "use me". The standard fare comprises aperture, shutter-priority modes and full manual, which allow you to determine the size of both the aperture and shutter speed concurrently for more creative shooting. Other features include adjustment of tone curves, sharpness, contrast, saturation, custom white balance, in-camera editing and flash synchronisation, to name a few. We can go on, but you get the drift.


Noise
Sure, you can whip out your latest digicam at a party. But the next day when your friends ask to see the pictures you took, don't give reasons such as "oh, my memory card burst into flames and I don't know why", when, in fact, you're embarrassed to say your pictures looked like they were covered with a layer of sand. That's noise. Shots from dSLRs exhibit less noise partly due to the larger image sensor which, on its own, is already a huge advantage over compact snapshots. Let's just say that a picture taken at ISO 400 on a dSLR can rival ISO 800 or even ISO 1,600 on a consumer camera.

Performance
Most point-and-shoots take some time to power up and it can be from 1 second to slightly over 2 at wose. So what? You missd a shot, that's what. If you had your hands on a dSLR before, you'd appreciate the near instant startup time, usually faster than you can time with a stopwatch. Shutter lag, which is the delay from the time you hit the shutter till the image is captured, is also practically non-existent on a dSLR. And we haven't gone into speedier autofocusing speeds and burst modes yet.


Accessories
Ultimately, buying a dSLR is akin to buying into a family of camera accessories and these can range from external flash units to battery grips to strobes, lenses, filters, etc. Skip this section if you intend to leave your camera only in full auto-shooting mode, which is a waste, really. Lenses play a huge role to complete that shooting experience. From general purpose to high-end specialty glasses, there's almost a lens for every photographic moment. We said, almost, didn't we?

So what now?
The list can go on, but the point we'd like to make here is digital SLR cameras are getting more affordable. While that may tempt consumers to make the switch, it is also important to consider whether they would be able to live with one. One thing for sure, dSLRs are not pocketable, yet, and are a lot bulkier than point-and-shoots. Like we said, if you plan to snap only in full auto mode, look elsewhere. Otherwise, a digital SLR camera could be a worthwhile investment if photography is your hobby.