Filter Ring Adapter

Filter Ring Adapter
Where can I find a special “filter” adapter from 37mm to 25mm?

I’m about to buy a Sony SR11 HD Camcorder which I understand has a 37mm lens. I’m going to be recording on a microscope which has an attachment for the camcorder of either 25mm on the outside of the rim, and the camcorder has 37mm on the inside. I found an adapter for 25mm to 37mm but it’s the other way around. I’m new with this stuff so I don’t really know much, but I would need something like this but the other way around:

http://www.sourcingmap.com/camera-lens-filter-step-ring-25mm37mm-silvery-p-11462.html

You need s Stepper Ring which “steps” up or down from one screw filter size to the other. Companies like Jessops do them – or any major online photographic business.

Sony Dsc-HX1 HX1 Filter Adapter Ring adapterring