A couple of questions regarding macro lenses in LF:

1. What are recommended lenses in this area? Are Nikon/Schneider/Rodenstock, e tc. all pretty comparable?

2. How much of an advantage does a macro lens provide over, say, an Apo Sironar -S or Nikkor-W at 1:1?

3. Practical approach to metering and lighting at long bellows extensions?