The easiest way to get TTL metering on a Twin Lens Reflex (TLR) Rolleiflex is of course to buy a new one, but let's say you love your old 2.8F and want to do things a different way? Well here's how you can do this in two steps....
1) buy or build an adapter frame that fits your camera like the WLF would on the bottom side and that accepts a metering prism that is already made - there are a few of these adapters on ebay and I was curious so I bought one.
2) buy a metering prism. In my case I needed one that came in the Hasselblad V mount so I found a Russian copy that is a bit cheaper.
See the results! Does it work? Well it does work okay. And its for sale here! Metering Prism for TLR