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After using the Canon EOS R7 with the Canon 0.71x Speed booster I noticed that when stepping aperture down past f/4, there is a a purple/blueish blob in the middle of the frame.

When shooting wide open up to f/4 there is no problem and the quality of pictures and video files is good.

EOS R7 + Canon 0.71x Focal Reducer & Tamron 24-70mm f2.8 G2

However, unless you mostly shoot wide open, purchasing the Canon 0.71x focal reducer for usage with Canon r7 may not be the best investment considering its expensive price tag.

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Here is a link to my RAW files if you would like to download them and test them yourself: R7 Blue Blob

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