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Auto ISO control | You can switch it on and off in the shooting menu ISO sensitivity settings. This menu also allows you to change the ISO sensitivity as you do I always turn off AUTO ISO when I enter Manual Mode, otherwise Auto ISO changes the ISO and ruins whatever you were hoping to accomplish with manual exposureAuto (Flash Off): In this mode, exposure is automatic but the flash is disabled, and the camera will vary the ISO up to a maximum of 3,200, to capture images Manual Mode. In Manual mode, the aperture and shutter speed values are fixed by the user. ISO Auto will change the ISO when the light levels change. There is a firmware quirk with the D5100 when Auto ISO is selected and you are using manual mode, ISO will change automatically which defeats the purpose of I work around it by setting auto-iso in "manual" mode. I pick my aperture, then I adjust the shutter and the camera adjusts the iso until I get