Tip for those who have problems with AF; The subject should be lighter than the background. When shooting at 1.4, set the shutter speed to 1/320 or faster. On all models, Nikon is younger than the D750 AF so-so. And don't zoom everything at 1.4 very often the depth of field should be more. It so happened that I already have this 3rd fifty dollars 1.4G and there were no problems with any of them.
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