The Viewfinder Handbook
This is the ultimate source of information about Viewfinder. The Handbook is destined to help you understand the basics of the app as well as explore more advanced topics.
It covers version 2.7 of all Viewfinder editions (Basic, Pro and Cine) and ALPA eFinder.
The Handbook is available in PDF format which can be viewed with several applications, including Adobe Reader, Amazon Kindle or Apple iBooks. You can download the 8.6 MB PDF file below. The web-based version of the Handbook is no longer available.