Question for Oly 12-40mm lens owners

doboy

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Jun 17, 2014
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I just received my refurb 12-40mm yesterday and noticed that the manual focus mode allows focus closer than 0.2m and goes past infinity mark. It seems I can focus closer using the manual mode than AF mode. Is this normal? Thanks in advance.
 

doboy

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Jun 17, 2014
Messages
66
That's what I've read.
Haven't really tried it on mine though.

Barry

Sent from my iPad using Mu-43
Thanks. I can't believe no one knows for sure. I guess I can give tech support a call next week.
 

MarkoPolo

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Jan 25, 2014
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I have the lens, but have not tried it in that regard. It sure does allow a near macro capability. Just curious why it would matter if it does or not?
 

doboy

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Jun 17, 2014
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I have the lens, but have not tried it in that regard. It sure does allow a near macro capability. Just curious why it would matter if it does or not?
I'm just trying to confirm if the manual focus ring goes below 0.2m mark and above the infinity mark in manual focus mode. I'm trying to make sure my lens isn't "broken" since it was Oly refurb. Thanks.
 

Rudy

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Jan 24, 2013
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I'm just trying to confirm if the manual focus ring goes below 0.2m mark and above the infinity mark in manual focus mode. I'm trying to make sure my lens isn't "broken" since it was Oly refurb. Thanks.
Yes it does and it's by design. The contrast detect autofocus method used in MFT cameras requires the lens to be able to overshoot the target focus to see that the image gets "worse". Therefore the range has to be a bit wider.
However there is not really a good reason to make this extra range available in manual focus especially on the infinity side as it prevents the user from blindly going to the end of range to get to infinity (for star light pictures for example).
So the real reason might be to allow for some manufacturing tolerances in which case the distance markers would be off on some lenses.
In any case, what you see is normal.
Rudy
 

doboy

Mu-43 Regular
Joined
Jun 17, 2014
Messages
66
Yes it does and it's by design. The contrast detect autofocus method used in MFT cameras requires the lens to be able to overshoot the target focus to see that the image gets "worse". Therefore the range has to be a bit wider.
However there is not really a good reason to make this extra range available in manual focus especially on the infinity side as it prevents the user from blindly going to the end of range to get to infinity (for star light pictures for example).
So the real reason might be to allow for some manufacturing tolerances in which case the distance markers would be off on some lenses.
In any case, what you see is normal.
Rudy
Thanks for the explanation. :2thumbs: So can you even rely on the infinity mark on the lens?
 

doboy

Mu-43 Regular
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Jun 17, 2014
Messages
66
I'm out shooting with it now and it seems mine also lines up well with the infinity marking.
 
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