It has been a long wait for the 5D Mark 3 and 1DS Mark IV, EOSHD.com explains why. As we know, things have been quiet on the Canon again grapevine since Photokina. Throughout the year Canon have not advanced their flagship DSLRs as we hoped they would, and Photokina 2010 marked the 3 year point in Canon’s product cycle for the 1DS. The camera did not show, so people began…