Yes, I've noticed the same thing with mine: a touch of stiction when they haven't been used for a while. Seems to be normal with this model. (I can also see the same lines as on yours if I really look for them.)
I'm new to birding, so please forgive me if I ask the odd stupid question. (I'll always try to look for an existing answer before I post. Promise.)
Heading into retirement and I live right by Stanley Park, which seems to have a decent variety of birds.
I never get bored of the bald...