Don't know about the shorty f/5, but I had a 120mm f/8 achro that I took just one photo through. It had mild fringing - nothing that a MV filter couldn't handle within its limitations. The optics were pretty sharp, which was a bonus. The following photo is the one I took of the moon.
Photoshop - quick unsharp mask and conversion to B&W in SC3.
The higher res version is here:
http://www.omaroo.net/albums/album36/moon_saxon120.jpg
Not a bad scope for the money.