There's very little difference in overall size between the EOS 450D and the 400D. The body design has undergone a softening and rounding which appears to make the EOS 450D look more like a mini-40D. The shoulders (either side of the viewfinder) have been softened and rounded and the left and right sides of the camera are now more balanced in appearance. You can see these changes a bit more clearly using the A/B comparison further down this page. The rear of the camera is now completely dominated by the huge-on-a-compact-DSLR three inch LCD monitor. This has forced a fairly considerable reworking of the button layout with no space to the left or below the LCD as there was on the EOS 400D.
Just like the EOS 400D the 450D is primarily made from three materials; a stainless steel chassis (blue in this diagram), the mirror box which is made of high-strength 'engineering plastic' (red in the diagram) and the body made of a special lightweight 'engineering plastic' which also provides some electromagnetic shielding. Construction is very good (considering the budget price) with no creaks or rattles. (Diagram provided by Canon, our colorization).
In your hand / grip
When we first saw the EOS 450D we were hopeful that the body redesign had also been extended to improving the grip. Alas this is not the case, in fact the only difference in the grip between the EOS 450D and the 400D is about two millimeters at the rear of the camera, the size and profile of the front of the grip is identical.
Hence we're left with the still fairly cramped and narrow grip (see comparative animation below).
Side by side
Below you can see how the EOS 450D shapes up to some of the competition and the camera it replaces, the EOS 400D. Dimensionally all of these cameras are much of a muchness, the Olympus E-420 being the 'thinnest' and the Nikon D60 the narrowest, but we're splitting hairs and talking about a few millimeters. Weight wise the E-420 is quite a bit lighter than the Nikon and Canon with the Sony DSLR-A350 and Pentax K200D (not shown below) somewhat heavier.
(W x H x D)
(inc. battery & card)
|Olympus E-420||130 x 91 x 53 mm (5.1 x 3.6 x 2.1 in)||436 g (1.0 lb)|
|Canon EOS 450D||129 x 98 x 62 mm (5.1 x 3.9 x 2.4 in)||524 g (1.2 lb)|
|Nikon D60||126 x 94 x 64 mm (5.0 x 3.7 x 2.5 in)||536 g (1.2 lb)|
|Canon EOS 400D||127 x 94 x 65 mm (5.0 x 3.7 x 2.5 in)||556 g (1.2 lb)|
|Olympus E-510||136 x 92 x 68 mm (5.4 x 3.6 x 2.7 in)||562 g (1.2 lb)|
|Sony DSLR-A350||131 x 99 x 71 mm (5.2 x 3.7 x 2.8 in)||664 g (1.5 lb)|
|Pentax K200D||134 x 95 x 74 mm (5.2 x 3.7 x 2.9 in)||694 g (1.5 lb)|
Design changes compared to the EOS 400D (Rebel XTi)
Place your mouse cursor over either image below to compare the design of the EOS 450D (Rebel XSi) to the EOS 400D (Rebel XTi). The design changes are subtle however noticeable in a A / B comparison like this.