Unwanted flares

Original scan direct from the negative.

I noticed flares in the last batch of film that was processed. Never understood why as I was making sure not to shoot directly into the light. I had thought perhaps my 50mm was having issues however photos shot with the 80mm were having the same flares as well.

This struck me as odd as I didn't have this issue with it before. So I thought long and hard and noticed all the shots with flares had a B+W UV filter attached.

Processed imaged from the lead photo.

I thought boulderdash! I've used UV filters for ever and not once had an issue. So to make sure it's the UV filter and not the actual lens, I'll shoot the next roll without the filters and if they come out clean then no filters for The Broni.

The Canon lens work A+ with the filters so I'll leave those on.