Welcome to the mood swings of the digital electronic computerized camera world called advancement in technology LOL.
With the eye tracking, 3 d tracking, subject detection, and all those focus options, don't worry to much about it, time will help a lot here, i personally feel we put to much dependency or pressure on needing these features. I tend to use it less than more often, it works better in ideal conditions and specifically suitable subjects, and yes light is our best friend or worst enemy.
Below are some quick snaps using, mostly low res camera with say 50mm 1.4 D or 300mm lens, all hand held and getting seriously close using old school skills LOL.
There not perfect or esoteric fine art shots, but shows we can still get some eyes in focus ourselves if we wish LOL.
The Gorilla was initially a long way away and its a massively cropped image, my eye contact with him which was a mistake made him charge with lighting speed so much so you couldn't see him coming he was just that quick, the fact i was 20 feet up above him saved me being seriously hurt. I wont do that again.
Its good to embrace new technology, but i feel we shouldn't give up on our well learned skill sets, they still work, and don't play up on you LOL.
The model in the bath is really unedited but the D4s did well using just the 50mm 1.8 D
The seagull was on the D3X 300 2.8 VR II hand held ( heavy) with a 2 times TC III making it 600mm, i cant remember.
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