The Actus-G is optimised for use with DSLR and Mirrorless camera bodies. It's possible to add a rear frame that accepts a Digital Back, but there will be a height discrepancy between front and rear. This spacer solves the issue and enables the use of Actus-MV rear bayonets and DB frames.

The Actus-DB2 is the dedicated Actus version for use with Digital Backs. However, if you'd like to work with the nifty ACDB-990 or ACDB-991 rear frame and want to be able to switch between Digital Back and camera body within a minute, the Actus-G990D/G991D (depending whether you're using Hasselblad CFV or Phase One) is the way to move forward.

ACB-978 fits between front standard and rail of an existing Actus-G. It comes pre-assembled with spigots to assure perfect alignment at the camera's rail. This prepares your Actus for use with (the slightly higher) Actus-MV bayonets and DB frames.