a bit of everything…

TTArtisan 7.5mm F2 APS-C Fisheye Lens Manual Focus for E/EOS-M/X/M43/Z/L/RF Mount

The Lens Every Photographer Should Have and Use: The 35mm (Explora).
Underwater Photography Composition Basics, Part 1 (42West).
This Weird Magnetic Lens Filter can do 7 Things (Mathieu Stern)
Panaleica 10-25 f/1,7 Fazit (Pen And Tell).

Plenty of news on the facebook OMD group, Panasonic FF and the GH5 group.