What are these sensors on the inside of the lens mount?

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Canon EOS Rebel T3 / 1100D

The Canon EOS Rebel T3, also known as the 1100D, is a continuation of Canon's entry-level line of DSLR cameras, the Rebel series. It features an 12.2 MP sensor and a DIGIC 4 image processor.

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Daniel Beardsley @danielbeardsley

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What are these sensors on the inside of the lens mount?

When trying to investigate a broken auto-focus on my Canon EF-S IS 15-55mm lens, I found the problem (a broken flex cable) but also created another (I broke a different flex cable)

I'm ordering a replacement for both but on the part I broke (the lens mount ring) I'm really not sure what the two sensors are that the ribbon cable connects to.

Nearly all the replacement parts for sale don't have the sensors and the ones that do are quite expensive. Do I really need them?

Picture of the lens mount *with* the sensors:

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Flying Dutchman @flyingdutchman

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These are the IS sensors. Note they are mounted at 90 degrees to each other, which allows them to capture horizontal and vertical movement of the lens barrel during exposure, such that the IS system knows what it needs to compensate for. Omitting these sensors will permanently disable the IS function, which happens to be one of the few saving graces of this cheap kit lens.

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