M39 Screw Mount SLR Lens to M42 Screw Mount System camera bodies – Fotodiox, Inc. USA
Raynox HD-5050PRO, HD-5050PRO-LE 0.5x High Definition Wideangle Conversion Lens for HD Camcorder
Amazon.com : Metal M35 Male to M35-T2 mm Female 35mm 1mm Thread Pitch to T2 42mm 0.75mm Thread Pitch 35mm-42mm Step-Up Coupling Ring Adapter for Lens Filter : Electronics