My DSLR camera Nikon d3400 has mini HDMI and I want to see what I am seeing on camera display screen on my laptop. Laptop doesn't have HDMI input but only out put. What should I do.
If you just want to see your Nikon photos on your laptop, remove the memory card, plug a card reader in to your laptop via USB port, then insert memory card in to the appropriate slot on the card reader.
Apart from the HDMI port, the camera also has a USB port according to the spec sheet:
You should be able to use this (with a suitable USB cable) to display photos on a laptop screen direct from the memory card instead of using a card reader.
If you just want to see your Nikon photos on your laptop, remove the memory card, plug a card reader in to your laptop via USB port, then insert memory card in to the appropriate slot on the card reader.
Apart from the HDMI port, the camera also has a USB port according to the spec sheet:
You should be able to use this (with a suitable USB cable) to display photos on a laptop screen direct from the memory card instead of using a card reader.
What you are trying to do is called tethering. There are lots of resources on the internet which talk about this. Here is one of them:
https/digital-photography-school.com/tutorial-shoot-tethered/