>>2718066This image is somewhat accurate in showing the apparent sizes of deep space objects.
I believe M51 is around 1/10th the apparent size of M31. Hopefully it will help you visualize how small it is.
You will probably need a decent 500+ mm scope and accurate tracking to image it properly - no chance of imaging it untracked.
It's also not visible to the naked eye so you'd probably need to be in a dark sky area to avoid light pollution.
