sinar

I just received a mixture of camera bits I recently bought. Amongst the items are a Sinar F2 with this customised front standard frame. Anyone seen this before? I can only guess it's to hold in a heavy lens. Perhaps over engineered? Also included is a Norma shutter with different shutter speed...

Hello, Still looking for a good light meter and I found on eBay a Sinar Six Exposure Meter with Probe. What do you think about this device? Thanks Henri