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The PD-100 and PD-100a were the "pro" version of the TRV-900 whereas the PDX-10 was the pro version of the TRV-950. Actually the bodies are completely different as is everything inside. Both cameras had their strengths. The PD-100 had 1/4" chips, full manual control and better low light response than the PDX-10. I believe it only recorded in DVCAM mode. It had a removable XLR adaptor block which was connected via a mini-plug.
The PDX-10 had smaller (1/5") but higher resolution chips, a nicer LCD screen, shot real 16:9 and had a removable XLR block which connected to the camera with an intelligent hotshoe. It had manual control, with some caveats; there is a little ND filter wheel inside which automatically kicks in even when the camera is in full manual mode. It can't be disabled or manually over-ridden and Sony has never documented it. The purpose is to force you to use iris openings in the "sweet spot" of the lens. The PDX-10 doesn't do as well in low light and it has a tendency to show vertical smear when bright point light sources are in the frame.
So depending on your priorities, some people prefer the PD-100 for low light situations and full manual control, while others (like me) like the PDX-10 for its high quality 16:9.
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