If you like the idea of having am Drop-in Filter Adapter for E-mount cameras you can now join the crowfunding project at Indiegogo (Click here):
OWL combines camera adapter and exchangeable filter. User can change filters in a quick and convenient way during filming or photographing. It advances your workflow and cost saving. From now, you just need to prepare one filter to fit all your lenses. You will definitely have a total new experience in photography.
There are also two reviews of the OWL:
1. “The build quality looks and feels excellent and all parts are made from aluminium. The adapter lens mounts look high quality and durable, no lens wiggle here.” by Wim Arys https://www.wimarys.com/deo-tech-owl-filter-adapter-review/
2. “It has potentially less reflection and flaring than most front mounted filter ” by Nitsan Simantov https://www.youtube.com/watch?v=XL4JuXaCsc4