Please explain Minimum Aperture Lock for 80-200 F2.8

Started Jun 20, 2009 | Discussions thread
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Please explain Minimum Aperture Lock for 80-200 F2.8
Jun 20, 2009

I have just bought a new 80-200 AFD 2.8 and stumbled on one unusual feature (at least for me). There is a small lever located very close to the lens collar that can slide back and forth. The manual explains:

"For programmed auto or shutter-priority auto shooting, use the minimum aperture lock lever to lock the lens aperture at f/22.

1. Set the lens to its minimum aperture (f/22)

2. Slide the lock lever in the direction of the aperture ring so that the white dot on the tab aligns with the orange dot.

To release the lock, slide the lever in the reverse direction."

I have owned a few Nikon lenses but never seen this feature before. I need a better expalaination than the above factory statement. My questions are in which condition/purpose this feature becomes useful? why you need to lock at minimum f22? If you use shutter priority and lock the aperture f/22 then this is not shutter priority anymore, it's a manual mode. Am I right here? I simply don't understand. Thanks in advance. Bill

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