This is brilliant, complete with branded lens cap.
freemium
[Most people lean toward the 25mm.]
...then there's the Panasonic, which is bigger:
https://www.youtube.com/watch?v=hqQUmt1RpzQ
Oh, the "portrait primes"
https://www.youtube.com/watch?v=soPYgzMQaVs
Online archive of unusual lens samples: M42, M39, C-mount, Exakta and many more. All tried on Micro Four Thirds (M4/3, MFT) camera.
Alternative: Jupiter 8 50mm, M39 rangefinder
https://camerapedia.fandom.com/wiki/Jupiter-8
https://www.mu-43.com/threads/helios-44-58mm-or-jupiter-8-50-or-something-else.27115/
Helpful experience:
https://www.leicalensesfornormalpeople.com/2020/05/06/jupiter-8-50mm-f2-review/
some support raw files; many require Docker
Top contenders:
Photoprism
Librephotos/Nextcloud
Photoview
Photonix
Google Photos is an excellent platform to store and back up your images and videos. But you can host your own media server on Linux using these apps.
Stingle Photos is a convenient, easy to use Gallery/Camera application with Backup and Sync functionality for your photos and videos which seamlessly provides strong security, privacy and encryption.
