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Purchased a Excellent Used Eos R a few weeks ago. Love it, except it has a definite red tint to its AWD photos (and in the view finder, if I'm honest). The following photos show it:#1 - Taken with my Google Pixel 2 phone. Color is accurate in this on...
Purchased lightly-used 1st generation 500mm f/4 lens. I'm not sure what "I" and "O" mean for the setting. Also, when would I use Mode 1 and/or Mode 2 (see photo)? Would love any help for these settings. Thanks! 
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