Rent GH5, XL speedbooster, Sigma 18-35 f1.8, variable ND filter. in London (rent for £42.00 / day, £38.57 / week)
Hands-on with the Panasonic GH5 II: Digital Photography Review
Amazon.com : 58mm ND Variable Neutral Density Filter for Panasonic 12-60mm f/3.5-5.6 Vario Aspherical Power OIS Lens : Electronics
52mm Nd2-400 Neutral Density Fader Variable Nd Filter For Panasonic Lumix G Vario 45-200mm F4-5.6 Ii Power Ois Gh5 Gh4 Gh3 G7 G6 - Camera Filters - AliExpress
Filters for Panasonic Lumix DC-GH5
Amazon.com : 46mm Variable Neutral Density Filter for Panasonic Lumix G 20mm F/1.7 Lens : Electronics
3 BEST Lenses For The Panasonic GH5 + ND Filter Hack - YouTube
ND filter, follow focus & lens adapter Review of the DEC Vari-ND ⎜ Fenchel & Janisch Film Production