13. AF PERFORMANCE PARAMETERS
PHASE DETECTION SYSTEMS in DSLRs vary between brands and models. There are several factors that will determine how versatile, accurate, and usable a system is. Two generalities are true: Technology develops over time; and the more you pay, the better technology you will get. In this section we’ll look at the factors to consider when comparing the focus systems of a DSLR.
Focus Points
Likely the easiest aspect to compare is the number of focus points available on a given camera. The first AF cameras all had one focus point in the middle. It wasn’t long before the number grew to 3, 5, 7, 9, 11, 15, 45, 61, and then ...
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