
BT 143 – 114mm Rubber Donut with 138mm Retainer
Reduces the matte box rear from 143mm to 114mm. A 138mm round filter can also be placed in the front of the rubber donut. Threaded adapter rings can also be used to reduce the diameter further.

Reduces the matte box rear from 143mm to 114mm. A 138mm round filter can also be placed in the front of the rubber donut. Threaded adapter rings can also be used to reduce the diameter further.