SUMMARY
Many photographers overlook the focus limiter switch on their telephoto lenses, a feature that can significantly improve autofocus performance. This switch restricts the lens's focus search range, preventing it from hunting through its entire focus spectrum when autofocus loses lock. By limiting the search area, lenses can acquire focus faster and more reliably. However, incorrect settings can prevent the lens from focusing on the intended subject, making it essential to learn the specific ranges for each lens.
TAKEAWAYS
Focus limiters reduce autofocus hunting by restricting the search range.
Correctly setting the limiter can speed up focus acquisition on telephoto lenses.
The effective range of focus limiters varies significantly between different lenses.
Macro lenses often have limiters that block out distant focus ranges, which can hinder use for subjects at normal distances.