The Zacuto Z-Finder is an auxiliary optical viewfinder that is specially designed for working with an HDSLR, or photographing in live view mode on your DSLR. These viewfinders encompass the LCD monitor on the rear of your camera, allowing you a clear, shaded view of your screen while working.
Off the cuff, one might think there are few, if any, differences between packing a DSLR system and an HDSLR system, but once you look beyond the basics, i.e. the camera bodies, lenses and tripod (the legs, but not necessarily the head), the differences start adding up.
Color management, the art and science of reproducing accurate skin tones, blue skies, red apples, and yellow bananas is a relatively painless process for about 90%-or-so of the human race. If you belong to the majority of the populous, own a decent monitor, printer, and a color calibration system - and actually take the time to use it – you should be able to faithfully render the color and tonality of the image you saw in the camera's viewfinder.