The Canon EOS 5Ds / 5Ds R successor is coming! According to the latest rumors from CR1, there’s a possibility of an EOS 5DS/R/ Mark II coming in 2017 and there will be only one body to replace the current Canon EOS 5Ds and 5Ds.
Canon EOS 5DS/R/ Mark II is rumored to have a new sensor and have some same features as the new released Canon EOS 5D Mark IV.
Source: CR1
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