For my work I need to do multispectral imaging at the highest resolution possible and in the shortest time. GigaPan EPIC Pro for DLSR Cameras has been the solution. I would never probably afford a costly InGaAs system such Osiris for infrared reflectography neither a large format scanning back camera. I can barely pay my bills! so I figured out I could be better off making panoramic imaging and the Gigapan EPIC Pro is awesome. Basically, this is what Google Art project does to produce the Gigapixel images of artworks. Gigapan EPIC Pro it’s still affordable, a bit expensive — maybe — if we consider it is basically a motorized panoramic head. Also there is a big difference in the price of the Epic Pro and the other two lighter models, BUT you really need the EPIC Pro. I use it both with a digital and an InGaAs camera. Among stitching software I like PTGUI. You can get high-resolution images in few minutes and without the hassle of forget to shot a picture in your panorama!
Here is a video with the Gigapan Epic Pro in action.