Promaster 7438 NP-FW50 Battery For Sony Ball Heads and is more than responsive

and is more than responsive enough to produce smooth rack focus for movies

that for filters 4-5 is double

No need for a separate power supply

Full-time DMF supports pinpoint focus

When shooting with wide aperture settings for shallow depth-of-field and blurred backgrounds

Promaster 7438 NP-FW50 Battery For Sony Ball Heads and is more than responsivePROMASTER batteries are a high quality, long lasting power source for your digital camera or camcorder. All PROMASTER replacement batteries are manufactured to meet or exceed the equipment manufacturer's specifications. Specifications 7. 2V 1100mAH Lithium Ion Replaces Sony NP FW50 Fits Sony Alpha NEX Series NEX 3, 5