With both of my Tamron lenses it is just a detent. I can turn past it either
direction. It can be handy to set a desired focus and easily get back to it
after either focusing further or closer.
-jeff
From: Mike <watershed@xxxxxxxxxxxxxxx>
So I guess I better check that it doesn't restrict focus to infinity and
lock it down. Seems like another of those things to keep track of like
the exposure compensation dial.
mike
>>>2) What's the rotating ring with the little brass nob located in
>>>front of the rubber focus ring used for? At some position there
>>>feels like a detent.
>>
>>
>
>The knob on mine is black plastic. It's to limit the range of
>focus. For example, if you know the furthest point your subject
>is going to be is 150 feet, but it may come closer, like at a
>football game, focus the lens at 150 feet and tighten the knob.
>It will prevent the lens from focusing beyond 150 feet, but it
>will still focus all the way back to the closest distance of 8.2
>feet. In other words, it just locks in a new "less than infinity"
>stop.
>
>Walt
>
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