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12-08-2012, 10:58 PM   #1
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K-5II focusing screen or sensor issue

All of sudden, my two week old K-5II, when i look through the viewfinder, I see a pattern similar to a magnetic field lines, or perhaps a finger print, but with a more regular pattern. I never noticed this until today, and i don't necessarily see it in the pics i took today, but it is definitely noticeable when i look through the viewfinder at a "flat" surface such as a clear sky. The pattern isn't overwhelming, but it is definitely noticeable (and annoying on a 2 wk old camera). I do know that i accidentally changed lenses yesterday with the power on, so I am wondering if that has something to do with it. Any and all input and suggestions or fixes would be most appreciated.

12-08-2012, 11:02 PM   #2
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By the way, I forgot to mention that I cleaned the viewfinder and lens after i discovered the issue and it still appears. Thanks.
12-08-2012, 11:03 PM   #3
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This is normal when you mount slower lenses (generally F5.6 and below) and there is little ambient light.

What you're seeing are the ridges in the focusing screen.

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12-08-2012, 11:21 PM   #4
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I am using the 18-135WR. The first time i noticed it, the camera was set to f16. Does that change anything as far as this being normal? I was looking at the sky and it was late afternoon, but still pretty light out, although shadows were getting long. Thank you, btw, for the quick reply.

12-08-2012, 11:24 PM   #5
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QuoteOriginally posted by toukan Quote
I am using the 18-135WR. The first time i noticed it, the camera was set to f16. Does that change anything as far as this being normal? I was looking at the sky and it was late afternoon, but still pretty light out, although shadows were getting long. Thank you, btw, for the quick reply.
Even if you set it to F16 the lens isn't stopped down to that aperture unless you hit the DOF preview button, so that shouldn't matter.

Indoors with my 18-135mm, I see the same thing both at 18mm (barely) and 135mm (more clearly). The only remedy is to get a faster lens or shoot in more light.

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12-08-2012, 11:28 PM   #6
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Gotcha. Thank you. Also, having been coming to this site for months before i bought my camera, I have to say that i am impressed and thankful for the work you put into it. This site is a great resource. So thank you.
12-08-2012, 11:33 PM   #7
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If you see this pattern too prominently or with faster lenses, you may want to check for a stuck aperture (either in-lens or the aperture lever on the mount) or unintentional DoF preview operation.
12-09-2012, 12:14 AM   #8
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QuoteOriginally posted by toukan Quote
Gotcha. Thank you. Also, having been coming to this site for months before i bought my camera, I have to say that i am impressed and thankful for the work you put into it. This site is a great resource. So thank you.
Glad to hear you like it- we try hard and it will only keep on getting better


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