Zhong Yi Optics has announced the Mitakon Turbo Adapter II for Nikon Z-mount, which takes M42, Canon EF, or Nikon F-mount full-frame lenses and adapts them for use on Nikon Z APS-C cameras and widens the angle of view to more closely mimic their focal length on full-frame bodies.
Meyer Optik Görlitz has announced the 58mm f/1.9 II for multiple camera mounts and promises a lens that shares the characteristics of the original but manufactured with modern production processes and high-quality materials.
Russian optics company Shvabe Holding, which is known as the owner of the Zenitar brand, has announced four new mirror lenses: the MC Rubinar 1000mm f/10, 500mm f/8 Macro, 500mm f/5.6 Macro, and 400mm f/4.5 Macro. Redesigns of older lenses, these feature"improved technical characteristics."
A Hong Kong-based company called "NONS" has created a M42-mount ILC that can be used to shoot Fujifilm Instax Mini film. They're calling it the world's first M42 mount SLR instant camera, and it allows shooters to pair easy-to-find Fuji Instax film with much-beloved (and often very cheap) classic M42 lenses.
After using a vintage 1910 lens on a modern Sony a7II, Paris-based photographer Mathieu Stern is back again with another interesting lens experiment.
This time he created "bokeh madness" by attaching a Russian Jupiter 9 85mm f/2 lens onto his Sony a7II using a M42-to-E tilt adapter.
If you just so happen to have both a C-mount CCTV lens and a M42-mount teleconverter lying around, try combining the two: you may find a makeshift macro combo on your hands.