Galactic distances - comparing M31 and NGC891

At a recent star party, we showed guests views of M31, the Andromeda Galaxy, and it was surprising to some just how big it appears to us (because it's so close, in terms of intergalactic distances). Now, earlier this week I published an image of NGC891. Well, two nights ago I photographed a portion of M31 (that's all that would fit in the field of view) and thought a side-by-side would make for an interesting comparison.

The field of view in both images is 26.4 arc-minutes, or, a little less than the
apparent width of a full moon.

http://www.pbase.com/wjshaheen/image/130070896/large
Scroll down to find the links to the individual galaxies' images.