I recently noticed a slight bluish tint to the pictures I was getting from my N50. It became progressively worse, so a tried to narrow down the propblem. I took the same shot with two different rolls of film, using two different lenses, two different flashes neutral density filters on both and then a tiffen warming filter on one, using two different profram setting, changing obe variable at a time. The tint remained, which leaves me with a camera problem.