Question about AF/MF on 85/1.4

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I noticed whilst playing with the 85/1.4 that if I turn the focus ring when the lens is in A mode there is a click and then the focus ring locks and won't move. I have to move the lens switch to M so that the ring will rotate again.

Is the lens designed to do this and does it damage the lens if the focus ring locks like that? I find that I am gripping around the focus ring when holding the lens and sometimes it accidentally moves a bit and then locks.

Thanks.
 
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I know some people leave the M/A ring in the middle, but I use mine locked in either M or A so it does not do what you are describing.

Or are you describing the fact that this is not a lens that has the ability to manual override the focus when in autofocus like the 17-55, 105 ,etc?
 
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As far as I can see. if I try and use the manual focus ring when the lens is in AF, it locks and won't move (as I said, I actually moved the focus ring accidentally which is when I noticed that it then locks solid). Just wondering if this is normal behaviour. The lens still autofocuses OK, just that the focus ring locks solid and only moves when the M/A switch is moved to the manual position.

I guess the summary is that this lens does not allow manual focus when the switch is in the A position, and in fact the focus ring locks solid rather than freely rotating. Just wondering if that is normal behaviour.
 
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This is normal for the older type (gear driven) AF lenses. The newer AF-S lenses, without gear drive) can be used in MF override, even when in AF mode. It is a mechanical thing.
 
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Thanks Frits. Am I correct in assuming that if I do accidentally move the focus ring when the lens is in AF mode that it will do no harm and I can continue to use it?

I have started moving the A/M switch to manual to release the focus ring and then switching back to A mode, but I will stop if I am not harming the lens in any way.
 
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Thanks Frits. Am I correct in assuming that if I do accidentally move the focus ring when the lens is in AF mode that it will do no harm and I can continue to use it?

I have started moving the A/M switch to manual to release the focus ring and then switching back to A mode, but I will stop if I am not harming the lens in any way.
Won't harm it in any way. The gears will just "catch" again when you go back to AF mode - no issue.
 

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