Hi- I am new here, and have a question that is something likely very simple. I recently set up a dark room in my home with a Beseler Printmaker 35 from Goodwill, a negative carrier from Ebay, an easel, lens, & jam nut from Freestyle and everything else from Photo Warehouse. Tonight was the first night that I was able to use the darkroom and I couldn't get square edges on my photo. Something was hindering the light so it formed a circle when it came though the lens and I troubleshooted for a while and I couldn't figure out what it was. The edges came out all hazy in the corners. Does anyone know what to do about this? Thank you.