When Nikon D90 is in the m range, it is not easy to focus on portraits.

What happens when you use M file is that the exposure and aperture are wrong. Or the aperture is too large, which will happen when shooting at a distance. I don't know if you are a novice or an expert. If you are a novice, you can use the aperture first and then know how to choose the appropriate shutter and aperture.

Automatic gear is all the parameters of the camera, which are automatically adjusted according to your metering subject. Manual focusing, many need to be adjusted by yourself. Photography is not that simple. I hope you can shoot more. See the effect of different aperture shutter every time.

I am also a D9017-55105VR70-200 small bamboo gun, so we can communicate more if we have nothing to do.