Just want to pass on a recommendation for Astronomy Tools calculators.
In the Field of View tab, I select an object to view and then plugin details of my scope.
Then plugin eyepiece details and generate a display of what I will observe.
Add each of my eyepieces and get a full comparison image.
As per the attached screen grab, just love it!
Useful for anyone contemplating a new eyepiece.
Also check out the other calculators and options available.
http://astronomy.tools/calculators/field_of_view/