Originally posted by Ex Finn. Does it resemble a "finger print". If so, it most likely is the matte focusing screen you are seeing.
I am an atheist, but will say Lord almighty! God bless you.
I cannot thank you enough!!!!!!!!!!!
My brain had gone haywire. I felt like tearing my hair out. I bought a new camera last year. I saw finger print in the viewfinder. I was pretty mad at Pentax for not doing good quality control. I used to see a constant finger print through the viewfinder.
I cleaned the lens, viewfinder several times, last night cleaned the focussing screen thinking it might go away. The last thing I wanted to do was, open the camera and clean the prisms.
Glad I read your post. I think I can now sleep at night.
Cheers!