I should also point out that the SQ-B doesn't have the needed metering gubbins so the TTL metered prism wouldn't work. I'm not too keen on buying that much more equipment for my Bronica at the moment as I'm planning to go 8x10 next year. One item I'm thinking about though is the 250mm PS lens, although I would not be adverse to the 'P' series lenses depending on the performance.