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Re: [OM] two more 300/2.8 questions

Subject: Re: [OM] two more 300/2.8 questions
From: Mike <watershed@xxxxxxxxxxxxxxx>
Date: Fri, 19 Sep 2003 21:40:35 -0700
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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