Good stuff, Charles. The Chinese trainer is the Nanchang CJ.
It looks like you have a dust spot on the front or rear element of the lens. Look just above and to the left of the center and you can see a small gray spot on your images. It is easy enough to clean up in photoshop with the clone-stamp tool. (Sorry, I only see these things because I have some dust spots on my sensor that I have to clean up in photoshop)