I got the Canon EF to R Adapter with the drop-in variable ND filter a few months ago but never had a chance to test it until yesterday afternoon.  Headed out to South Perth in the afternoon to take a few shots of Perth City view using the Canon EOS R, the EF-R adapter with the var ND filter and the Canon EF 16-35mm f4 IS lens.

Majority of the shots were taken with about 20-30 seconds exposure… Am pretty happy with the var ND filter.  Didnt really use it at the max level as the colours were way off…

And this extra shot using the Canon EF85mm f1.8 lens…