I am not a complete newbie and I am familiar with various autofocus modes of recent Nikon bodies being an owner of D7000 for almost 2 years. Please take into account, that I am talking about a specific scenario where I shoot my son who is walking or running around indoors. I use SB700, camera is in manual mode, spot metering in order to switch to TTL mode and ISO 400 or higher.
I think that my issue may be caused by 3 things : 1. Limited DOF. I should probably increase the aperture to at least f4 2. Low shutter speed. What would be your recommendation for the minimum shutter speed in this scenario for the 85mm focal length? 1/125s was OK with D7000 in a similar situation 3. Inappropriate autofocus settings for the specific situation. Please note that I use AF-ON button to focus, so I am always in AF-C mode.
Darrel, I do not think that AF-S would be the best mode to shoot a child who is constantly moving around. Again, I might be wrong. Now, which area mode shall I use? I used 3D on D7000 almost all the time and the results where acceptable. Shall it be different with D800?
I try to focus on the eyes. The trouble is, that by the time I press the shutter release, my son can move his head slightly or even start walking towards me.