The firmware update for the cross-type sensors at the outer areas of the frame is still not released (for Nikon D5, D850 and D500) - Nikon Rumors
Nikon confirms the 51 AF points in the D750 are narrower compared to the D810 - Nikon Rumors
Does the 11 af points (Nikon D3400) vs the 39 af points (Nikon D5300) makes much difference when it comes to street, landscape, indoor and outdoor events, portrait, candid photography? - Quora
51-Point Autofocus System – Learn & Explore - Nikon South Africa
Nikon D750 review: Better to wait for the D760? | Expert Reviews
価格.com - 『D750のAFエリア』CANON EOS 6D Mark II ボディ Paris7000さん のクチコミ掲示板投稿画像・写真「初のフルサイズのおススメは?」[2958006]
Nikon D4s « NEW CAMERA
Focus modes explained - Understanding camera autofocus modes
Nikon D750 Review
Nikon Z6 vs D750 - The 10 Main Differences - Mirrorless Comparison
Nikon confirms the 51 AF points in the D750 are narrower compared to the D810 - Nikon Rumors
autofocus - What could cause the focus to be off in some images and not others? - Photography Stack Exchange
Review: Nikon D7500, speed and capability: Digital Photography Review
D750 – Digital SLR Cameras - Nikon Singapore Pte Ltd