So I just got this light meter Sekonic 358, and I was hoping to use it to check the accuracy of my old Nikon FM with a built in spot meter. But obviously it's either I did something wrong or the Sekonic is faulty. Can someone help me? I know for a fact that my Nikon's meter is more or less accurate, but no where as far as to 3 stops. The Sekonic is a new thing to me. Both at ISO 400, T=1/30, My Nikon reading is F-11 My Sekonic is F-5.0 with sphere down F-6.3 with sphere up. Both readings are against the same spot on the window curtain. MEDIA REMOVED - Video is "private"