bobmoose
Bob Moore
I am using a Canon 300mm IS 2.8/1.4x combination with my 7D. It works fine with low ISO but have noticed recently , as the light is getting duller and I need higher ISO that when I shoot at 1600 my images need to be underexposed by up to two full stops to not be completely blown out . I meter to a neutral exposure setting normally . I don't know what the problem is. It doesn't seem to be a problem with my 400mm 5.6. Any ideas?
Thanks
Thanks