The Longer Monorail AC-330 (300mm length) for the ACTUS camera system can optionally be mounted to the ACTUS as well as the ACTUS-DB.
Allows for 1:1 with 120mm macro lens.
The ACDD-254 long extension bellows is made to match the AC-330 Monorail of 300 mm. As the total extension is 50mm less due to the position of the front standard, the bellows extends 250 mm at full rail length, but physically you can stretch it to 300 mm.
*Note: The use of a longer bellows ACDB-254 is needed when the total length of the monorail will be used.