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From looking at the specifications at Canon USA, it seems iFCL is the 2 layer metering sensor:The XS, and other entry-level Canon bodies, don't have Spot metering mode, don't allow the metering to follow the chosen focus point, and don't have a metering system that is color-aware.
The T2i and T3i do indeed have spot metering and iFCL (Canon's version of color aware metering).
From the "Overview" for the 7D - Canon U.S.A. : Consumer & Home Office : EOS 7D
New iFCL Metering with 63-zone dual-layer metering system uses both focus and color information to provide accurate exposure even in difficult lighting.
This is from the 7D specifications listed at CanonUSA.com:
63-zone SPC TTL metering with selectable modes
This is listed for the T3i specifications at CanonUSA.com:
TTL maximum aperture metering with 63-zone metering sensor
And for the T2i:
Neither the specifications nor the overview at CanonUSA.com list the dual-layer metering sensor for the T2i and T3i.63-zone TTL full-aperture metering
What is the SPC feature listed in the metering discription for the 7D?
Can you direct me to information indicating the T3i and T2i have the iFCL dual-layer metering system?