How can I connect to NFS from finder?
In order to mount an NFS share as a client, you need essentially two things:


The name or IP address of the server, referred to as DNSName
The share path


How do you find this stuff out?

This assumes you don't know what the share paths are.  If you already know, skip down to "Connecting"

Using my own personal Synology Diskstation as an example, I have shared two directories via NFS.  It's DNS name is diskstation.home.  Its IP address is 192.168.1.50 (not really, but it is for the sake of this example)

Launch the Terminal App.

At the prompt, type the following command:

showmount -e diskstation.home
(replace diskstation.home with your DNSname or IP Address)


In my example, the following is displayed:

$ showmount -e diskstation.home
Exports list on diskstation.home:
/volume1/netbackup                  *
/volume1/Network Share              *


Ok...so now I know what the two "share paths" are.  It's time to connect.

Connecting

Let's use finder:

Press CommandK to bring up the "Connect to Server" Dialog Box.
In the "Server Address" box, type enter the values in the format:

nfs://DNSName/path
or
nfs://IP/path


So, going back to my example, I would type:

nfs://diskstation.home/volume1/netbackup
or
nfs://192.168.1.50/volume1/netbackup


You should now be able to browse your network share.