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love the middle one of wall and pigeons.
Re: the 50mm blur
It's a manual focus camera so unless you've lost the little screws that hold it together and subsequently dismantled it there's a limit to what can mess up focus...
The only other thought I had was that since it's probably a fast lens (f1.8 or similar) it may actually just be a field depth issue and that you're focussed on the dark overhanging tree and everything else is out of focus due to the massive aperture
I have had a roll of 35mm Ektar developed. Shot on Pentax Super A. I think my 50mm is dead unfortunately. I get these weird blurs when using it. No problem what so ever when using the 28mm and 35mm.