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Thank you for the link Golf007sd. Tho, I already know you can configure the AF-L/AE-L button to function as a back focus button. Comparing the D7100 and the D800, at a local shop that let me 'fondle' both cameras, I find the dedicated AF-ON button on the D800 to be placed more ergonomically correct (for my hands/fingers at-least) - which is why I would be happy if Nikon added a dedicated AF-ON button, placed on the right side of the AF/AE button, on the D7100 successor.