На Д80 замер просто более консьюмерский, даже матричный режим отдает приоритет зоне фокуса: ( http://bythom.com/d80review.htm )
Good news, bad news, folks. Let's start with the bad news, since there are plenty of contentious threads across the Nikon forums on the Internet talking about the issue: the matrix meter is more sensitive to what's going on in the central area.
Say what? That's bad news? Yes, it is for those of you who've shot with the D70, D100, D200, D1 series, D2 series, or any of the Nikon film bodies. That's because all those other bodies are remarkably good at not being coerced into changing exposure based upon smallish non-middle gray things in the central area of the frame.
The D50 was prone to changing exposure in those situations, and the D80 is even more prone to changing exposure due to middle subject tonal value. If you're not following me, try the following: cut a diamond shape (like the AF sensor pattern) out of white paper, middle gray paper, and black paper. (I'm having you use a diamond shape so that you'll frame them the same.) Now place each of those against a middle gray background, carefully framing so that the diamond exactly fits the AF sensor pattern. Voila: the gray background is underexposed with the white diamond in the center, properly exposed with the gray diamond in the center, and overexposed with the black diamond in the center.
Для любителей экспериментов краткая суть:
В Д80 матричный замер чувствителен к маленьким не средне-серым участкам в зоне фокуса. Попробуйте сделать ромб из белой бумаги, средне-серой и черной. Теперь попробуйте снять эти кусочки по очереди на сером фоне так, чтобы мишень перекрывала в видоискателе все точки фокуса.
Опаньки: серый фон будет недодержан при съемке белого ромба, нормальным при схемке серого и передержан для черного.