When you say you’re editing in 4×3 with your Sony edit system are you seeing an anamorphically squeezed image on your monitor? If so, when you capture that in FCP it should remain anamorphic. When you play it, with the Sequence Setting for anamorphic checked, it should be 16×9 on your monitor. You should also check in the Browser that the anamorphic field (scroll right) is checked. You don’t say what the final output should be. But, usually, the player will adjust the image to 16×9 or 4×3 with letterbox automatically.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24″ TV-Logic Monitor
ATTO ExpressSAS R380 RAID Adapter, PDE Enclosure with 8-drive 6TB RAID 5
Final Cut Studio 2 (up to date)
Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN