Older Nikon 60 mm Micro lenses had a 52 mm thread. The newest versions have a 62 mm thread. The straight end of the longer tube slides into the ES-2 and is used to adjust the focus, held by the thumb screw (the ES-1 is only held by friction). The shorter tube is probably a 52-62 step-up adapter. The film strip holder looks very much like the cheaper versions I bought, hoping to use them in the ES-1. They're still handy for use on a flatbed, a copy table or my Novoflex copy setup. I'll know more when my ES-2 arrives.