I picked up this lens at a pawn shop for next to nothing, but I noticed it has a spot on the element just behind the front element. It looks like a condensation spot, and I expect it'll be easy to clean with a lens cleaner.
I tried removing the front element by unscrewing it, however, when it reached the end of it's threads, it spins freely but wont slide out, as though the focus ring is holding it in place.
Is there any quick and easy way behind the front element to clean the glass?
The lens in question is the one pictured here:
Pentax-A 28-80/3.5-4.5
Thanks!