A camera’s dimensions are often reported alongside its other specs (e.g. megapixels, ISO), but it’s pretty difficult to gauge exactly how large it is by those numbers alone. RealSize is a helpful iPad app that helps you get a better sense of size by displaying gadgets on its screen at exactly the size they are in real life.
With RealSize you will be able to create in a very easy way a virtual replica of the object you are interested in by defining a 3D box using the known width, depth and height of the object, and fitting pictures of the real object over the appropriate section of the box. The dimensions and pictures you need are usually easy to find on the internet. The procedure to create the object is fast, easy and pleasant, and the resulting replica is very precise, and surprisingly effective.
RealSize [iTunes App Store]