If I understand correctly,the tripod screw is the larger (3/8") size, and the so cket in the camera is the smaller (1/4") size. Most adaptors that I've seen wor k in the reverse direction. Rather than trying to find an adaptor that works, y ou might want to consider simply replacing the tripod screw. Most tripod heads permit the screw to be removed and replaced easily, without having to make any p ermanent modifications.