Ewa-marine AV110-L camera lens adapter

AV110-L - autofocus adapter The AV110 was developed for the use of auto focus lenses in the U-A... series of ewa-marine housings. The function of the AV110 is to ensure a fixed and rigid connection of the housing's front port to the tripod thread under the camera's body. This then allows the autofocus to lengthen or shorten the effective length of the lens without beeing effected by the surrounding water. Without the AV110 the lenses motor would have to "pump" air from the rear of the housing to the front, and vice versa, during focussing. This definitely exceeds the design specification of the motor and could lead to damages of the lenses mechanics.

AV110-L For the use in conjunction with large zoom lenses (eg. 300 mm focal length) in the ewa-marine U-AZ housing (System length: camera /lens between 170 and 230 mm