- Resumen: During extensive shooting and testing, I was impressed with the *ist, particularly with the improved autofocus performance. In reviews of some Pentax ZX-series cameras, I had made the following comment: “The AF system favors accuracy over sheer speed of focus acquisition or tracking of an ultrahigh-speed subject.” The *ist certainly proved superior in this respect, especially when used with a recent Pentax AF lens such as the FA 80-200mm f/4.7-5.6 zoom. With the older FA* 80-200mm f/2.8 ED(IF) model, continuous tracking focus was only moderately fast, but still adequate for tracking go-carts approaching my position...
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