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The Sony EX1 is popular among independent filmmakers due to the 1/2" TrueHD sensors, better depth of field control, and better low light capabilities.
Other comparable class cameras use 1/3" sensors and pixel shifting or other schemes to simulate resolution.
The PMW-EX1 utilizes Sony's three 1/2-inch type "Exmor" CMOS sensors, each with an effective pixel count of 1920 x 1080. Coupled with signal processing LSI, the PMW-EX1 produces images in 1080p (30 and 24 frame/s), 720p (up to 60 frame/s) and 1080i (up to 60 frame/s) HD.
The Sony EX1 records internally to SxS (S by S) cards (8,16,32 gig) and does not internally record to tape (an external tape device would be required). Unfortunately the expense of SxS ($160, $530 and $860 respectively) cards has been a major impediment to the indie filmmaker. The introduction of the SxS-1 card in December 2009 created a more affordable option for filmmakers, at the expense of a shorter operational life than SxS Pro cards.
Development of the ExpressCard adapters such as MxR, MxM and KxT have allowed the use of less expensive SDHC cards at standard frame rates and 720p rates up to 42 frame/s. Unfortunately only certain SDHC (usually class 4 or class 6) from certain manufacturers (Transcend and Sandisk) work with certain adapters. In comparison the 16 gig SxS card has a street price of $530, while the SDHC Sandisk class 4 card is $50.
Further complications are because some ExpressCard adapters do not allow the camera card door to close.2 These Express card adapters are not officially supported by Sony, but the firmware v1.11 or later supports them.
For 4:2:2 color, an external recording device would be required to be used utilizing the EX1's HD-SDI out.
External recording storage devices include: PHU-60K 60GB portable XDcam Ex Storage approx 200 mins recording time 
Sony SxS card management strategies for video and film production. 
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