M42 Screw Mount SLR Lens to Micro Four Thirds (MFT, M4/3) Mount Mirrorless Camera Body Adapter, with Macro Focusing Helicoid – Fotodiox, Inc. USA
HIKROBOT MVL-AF3528M-M42 | RMA Electronics, Inc.
Walmeck M52-M42(17-31) 17mm-31mm M52 to M42 Mount Lens Adapter Ring Macro Extension Tube Helicoid Lens Focusing Adapter Ring for Macro Photography - Walmart.com
Fotodiox Macro Focusing Helicoid - M42 Focusing Helicoid - 16MM to 30M – Fotodiox, Inc. USA
M42 Screw Fitting HOYA Lens 35-75 Mm F/4 MACRO With Hard Case. - Etsy
Amazon.com : MC INDUSTAR-61 L/Z 2.8/50 Russian Soviet USSR MACRO Lens M42 Canon EOS : Electronics
Amazon.com : Fotasy 25-59mm M42 to M42 Lens Macro Helicoid Adapter, 42mm Focusing Helicoid Extention Tube, 25mm to 59mm, 24mm Max Movement, fits M42 Screw Mount Lens : Electronics
Vello M42 Lens to Sony E-Mount Camera Lens Adapter LA-NEX-M42-M