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09-04-2012, 03:48 AM   #1
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Green laser

Hello Folks,

I've noticed that my K-5 has what appears to be a visible-light green laser range finder. When I'm using the 50-200 WR lens it only comes on when the lens is set long, at or about 200 mm. Why?

Thanks, Tom

09-04-2012, 04:10 AM   #2
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Its a focus light to aid the autofocus.
09-04-2012, 04:11 AM   #3
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That is the AF Assist Light. In AF.S mode it will come on when the camera determines it is needed.
09-04-2012, 04:11 AM   #4
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Hi Tom,
I assume you're talking about the small green light in the upper right part of the camera. This is an AF assist lamp. AFAIK it is not a laser device bt just a simple green LED. It is deisgned to help the camera autoocusing in dark conditions. Obviously it is only efficient at close range.
I'm guessing in your case it only turned itself on at longer focal length, because that is the most demanding situation:
- because of camera shake if you're shooting handheld;
- because on that lens the max aperture is limited to 5.6 instead of 4 at shorter lengths.
You can also choose to deliberately turn the green light off somewhere in the "C" menus. Look for "AF assist".

EDIT oops, I was too slow!


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