I quite like the idea of the changeable film cartridge. I had a Contax RX that was able to rewind the film with the leader still out so you could change rolls whenever you wanted. Also, being able to use lenses from different manufactures is quite cool.
Just came across this.
https://www.kickstarter.com/projects/reflexcamera/reflex-bringing-back-the-analogue-slr-camera
I quite like the idea of the changeable film cartridge. I had a Contax RX that was able to rewind the film with the leader still out so you could change rolls whenever you wanted. Also, being able to use lenses from different manufactures is quite cool.