The success of the Firefly 8S with 90º lens led me to purchase the earlier version, the 90º Firefly 7S. This camera has the common Novatek 96660 chip (not capable of native 4K) and Sony IMX078 sensor.
Like the Firefly 8S, the lens was very easy to release from its fixed focus. However, the main downside of this camera is that the app (iOS and android versions) does not support the full recording options – it does not allow time-lapse recording, and only allows real-time recording at HD (not the higher resolutions that are available via the on-screen controls.
I have lent this camera to a student before photographing it, so this image is one sourced from the internet!