A couple of days ago I was looking around eBay for Rollei stuff and I stumbled across a Rollei Glass Plate Back. It is an accessory for 'Flexes and 'Cords that makes an appearance in my 'Cord instruction manual.
I have a question about it, just because I am curious.

Basically, 50 years ago, why would someone choose to use glass plates over roll film in a Rollei? What would the inherent advantages be? Disadvantages? Do glass plates of this size exist anymore?