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Canon Digital Rebel XSI 12MP Digital SLR Camera

The EOS 450D represents Canon's response to the increasingly crowded and competitive nature of the entry-level DSLR market. Where the original 'people's DLSR', the EOS 300D, owed at least some of its success to the simple paucity of competitors, the market in 2008 is a very different place indeed, and one that's seen Nikon (with the D40/D40x/D60) carve a sizeable slice of the action, and where Olympus, Sony and Pentax have strong offerings at price points unthinkable just couple of years ago.
It would appear that Canon decided the best way to avoid getting caught up in the melee was to aim just a little higher, giving the EOS 450D as much of a feature boost as it could without it treading on the 40D's toes. So although some of the upgrades are an entirely predictable box-ticking exercise (bigger screen, live view etc), there are some pleasant surprises too. The new sensor is superb, and from a resolution point of view puts the EOS 40D to shame without losing any of the high ISO performance that has been Canon's trump card for so long. Canon was never going to take any risks with its biggest breadwinner, and we feel the EOS 450D is a significant, albeit incremental step in the right direction. We're certainly happy to see the improved buffering, spot metering and ISO button / viewfinder display, as well as the improvement in the viewfinder itself.
These performance improvements (not just in continuous shooting but across the board) and new features make the EOS 450D feel a lot less intentionally crippled than any of its predecessors, and put some clear blue water between it and cameras such as Nikon's D60 or Olympus's E-420 (with a small price premium to match). In fact you can't help thinking that there is now a space at the bottom of the EOS range for a true 'entry-level' model, something the internet's rumor mongers haven't failed to notice either.

Canon Digital Rebel XT 8MP Digital SLR Camera

The Canon EOS Digital Rebel camera now has a new, faster, even smaller big brother. Sibling rivalries aside, the 8.0-megapixel Canon EOS Digital Rebel XT SLR adds resolution, speed, extra creative control, and enhanced comfort in the hand to one of the smallest and lightest digital cameras in its class. Even with its advancements in ergonomic design and technology, this easy-to-use EOS digital camera is compatible with all of Canon's EF lenses, including the EF-S lenses.
Rebel Without a Choice No More
The EOS Digital Rebel XT camera takes its place alongside the original 6.3-megapixel EOS Digital Rebel camera that first placed an affordable, high-resolution digital SLR into the hands of Canon consumers. The EOS Digital Rebel XT model is offered in two kit configurations: with Canon's high-quality EF-S 18-55mm f3.5-f5.6 zoom lens (in matte black and in brushed silver) and as a body only (in matte black and in brushed silver).
The Canon Digital Rebel XT's image sensor
The Rebel XT's image sensor has the same 3:2 ratio as film cameras, creating an effective angle of view that is 1.6 times the normal EF lens's focal length.
While many of the feature advancements and innovations on the new EOS Digital Rebel XT digital camera are inherited from Canon's EOS 20D "prosumer" SLR, the two cameras' most striking technological similarities are their use of Canon's newly developed large-single-plate, high-sensitivity, high-resolution color CMOS imaging sensor technology. While the size of the APS-C CMOS sensor on the EOS Digital Rebel XT SLR is fractionally smaller than the APS-C CMOS sensor on the EOS 20D camera (22.2 x 14.8 millimeters versus 22.5 x 15.0 millimeters, respectively) accounting in part for the cameras' 8.0- vs. 8.2-megapixel resolution rating, individual pixel dimensions are identical, and they both provide the same effective angle of view, equivalent to 1.6x the normal EF lens focal length.

Digital Video Surveillance and Security

Digital Video Surveillance & Security provides a blueprint for the IP-based electronic security system clients need, allowing security professionals to protect their client's place of business or home. The author gives detailed plans on the best camera position, areas of coverage, hardware and software to select in order to maximize the effectiveness of newer lower cost networked technologies. Clear, step-by-step descriptions and detailed illustrations describe the integration of such components as the current or new security system, door and window sensors, or other access controls, instantly launching a video of the area under the surveillance on a computer or HDTV.
Vendor-neutral comparisons of camera equipment and recording options
Case studies and descriptions of best practices
Step-by-step guide to planning and installation
Easy-to-read diagrams and schematics
"This book provides all you need to know about digital video security and more, furnishing a detailed study of digital video monitoring. The market's growth and dynamism makes this text a relevant and welcome one for security professionals.. This book is extremely educational and should be consulted by any security professional interested in the transition from analog to digital video."-- Jack F. Dowling, CPP, PSP, Security Management, April 2011