JISC has released Toolkit: Equipment for Image Digitisation Projects.
Here's an excerpt from the announcement:
This Jisc Digital Media toolkit sets out to look at each of these technologies in detail, outlining both the theory behind the technology, along with more practical insights. It looks at cameras and scanners in depth and provide the stakeholder with the knowledge required to make informed decisions when purchasing, what can be, very expensive items of equipment.
Digital Scholarship | "A Quarter-Century as an Open Access Publisher"