I love mine. I have a roll film back so I can shoot anything from 2X2 to 6x9. I also shoot 9x12 fomapan 100 with it. The manual is online so you can read about it. Supposedly the lenses that fit the bergheil will also fit the avus but without the adapter used on the bergheil. You can also do macro with it and you might also try macro with the front element removed.
Same here. I have a Rada 6x9 adapter - I didn't know about 2x2. The sheet film holders are not easy to come by. Enjoy.