Originally posted by stevebrot As long as the light and/or subject [environment] has not changed, there is no reason to change your exposure.
Put
that statement on your morning coffee mug.
Micro-managing TTL exposure on a shot-to-shot basis can become a detrimental habit, especially with current post-processing options. Incident light is
relatively stable.
OTOH, TTL reflective light metering can change significantly with very little lens or target aspect movement; especially if using a narrow spot metering mode.
E.g., I've noticed as much as 1-1/2 stops difference with breaking surf, aspen leaves in a breeze and panning with moving targets with varied backgrounds. While that may offer some interesting and unexpected alternative images
intentional bracketing works better if you plan it.