[Vasya Pupkin (Pupkin)]

I have such question. I am very amateur in taking photos of DSO, but some photos I have tried to take. And I had such problem.
When I observed the region between Beta and Gamma Lyrae, I couldn't found there M57 (I live near Moscow, my light pollution is corresponding and I have not so good scope, 2,5 inches). But after taking photo of that region, I found it on a photo.
After that I tried to get a photo of M31. In my scope it is sometiong like a gray ellipse. Ellipse. By the way, without M32. But when I took a photo of it, I found M32 on the photo, but M31 exists on it only as a round spot. Round. It looks like my loved M13.
Why in one case my eye is more sensitive than the camera and less in other case?
Excuse me, if my English is bad, I am from Russia.

Camera:Sumsung NV3
ISO: 1000

Photos: M31-50*1sec, M57-30*1sec, M13-30*1sec