"The ATN Camera Adapter for NVM14 Monocular facilitates the attachment of a 35mm SLR camera, or a camcorder, to an ATN NVM14 night vision monocular. This adapter allows you to record night vision images: one side attaches to the night vision eyepiece with the help of the set screws. The other side attaches to the front of a macro lens with the included filter adapters, which are 37mm and 52mm.If your lens has either a 37mm or 52mm filter thread, you will not need any additional accessories. If your lens has a filter thread larger than 52mm, you will need a step down ring which begins with your lens' filter size and ends with 52mm. If your lens has a filter size between 38mm and 51mm, you will need a step up ring which begins as your filter size and ends as 52mm. If your lens has a filter size which is smaller than 37mm, you will need a step up ring which begins as your filter size and ends as 37mm.|Export of this product outside of the United States of America is not allowed and is controlled by the US Department of State"