If the front lens has no fingerprints and halos, it is sufficient to blow on it with the bellows, to eliminate any dust particles. Then with a brush, remove the dust that has not been completely removed due to the phenomenon of electrostatics.
After cleaning the lens with a micro fiber cloth and a drop of the cleaning liquid or other cleanser, clean other components which over time tend to accumulate dirt. A difficult situation for the exposure meter: the white egret with a background in the shade. Matrix reading and weighted average reading would inevitably lead to overexposure of the bird. The spot measurement carried out on the white subject helped resolve the situation like Fashion Photography Los Angeles.
Portrait against the light. The measurement with prevalence at the center and, although the algorithms are more and more sophisticated, even the matrix one, could lead to an underexposure of the subject. On the other hand, the spot reading, measuring the exposure only on the subject, allows to obtain the correct one.
