В то время, как некоторые товарищи восхищаются четырехзначным числом точек экспозамера у Никона, я наткнулся на почему-то новый для меня (и довольно точный) способ замерять экспозицию даже тупым селеновым экспономером (типа как на старых Зенитах). Достаточно поместить перед экспонометром серую карточку или некоторый ее заменитель, например, свою руку или кусок газеты, и замерить экспозицию 
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Цитата Martin Luerkens из Z.C.G.:
"I also read somewhere that you can generally meter the palm of your hand and end up with the same results as a grey card, irregardless of the pigment of your skin, as pigmentation of the palm of all races of people is essentially 18%."
That´s generally right. I have this tip from a photo book of NYC photographer Andreas Feininger, although he says that the insides of palms are about 0.5 to 1 f stop more reflective than the 18% Kodak card, hence he recommends to give a longer exposure in this range finally, vs. the meter reading. But at least one own´s palm is a permanent reference, find it out. Feininger furthermore says, that a normal newspaper page with text only like from the ad section mimicks exactly the 18% reflectivity of the Kodak card. In the past I have used both of his recommendations with any metering systems, just for the referencies, and all worked out well so far.