Back focus when using AF Assist on SB-900 / SB-700
I just got a D800 yesterday, and it seemed problem free until I started noticing that when ever I use it with the SB-900 / SB-700 with AF-Assist, there is some back focus issues. Even when I block the AF Assist light with my hand, it just back focuses more. But if I turn off the AF-Assist and use the one on my camera, everything is just fine. Maybe a software bug in the system? I'm not having the issue with my D7000.
Anyone else having the same issues? I can somewhat work around it if I dial the AF fine tune to -20 when using AF-Assist, but that's still not enough.
It happens with all my lenses, btw.
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#1. "RE: Back focus when using AF Assist on SB-900 / SB-700" | In response to Reply # 0
#2. "RE: Back focus when using AF Assist on SB-900 / SB-700" | In response to Reply # 1briantilley Nikonian since 26th Jan 2003Thu 07-Jun-12 11:51 AM
>News to me, I find that very odd, considering the light from
>the SB900 is measured to determine exact distance.
>IE, how long it takes the light to bounce back.
I'm pretty sure that's not how AF-Assist works. I believe the Speedlight emits a pattern of infra-red lines, which gives the camera's AF system something to lock on to in low ambient light conditions.
#3. "RE: Back focus when using AF Assist on SB-900 / SB-700" | In response to Reply # 2