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08-31-2012, 01:42 AM   #1
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Circle appears in all shots. K-30

Hi guys,

I'm getting a small circle in the middle of all my shots with a new K-30. Lens: 18-55 Pentax DA.

Just arrived here for a long weekend. Have never had this before. Lens looks clean as a whistle.

Should I let the local shop tec take a look? Or is this problem already known?

Thanks in advance.
Brendan

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08-31-2012, 01:51 AM   #2
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QuoteOriginally posted by grinnersinc Quote
Just arrived here for a long weekend. Have never had this before. Lens looks clean as a whistle.
And how clean is your sensor ?
08-31-2012, 01:56 AM   #3
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Hello!

I am not specialist in this subject. So I can reason only very generally. If it is possible, try to change the lens. It will allow you to determine whether problem is in the lens or in the sensor. If the circle disappears with a different lens, the problem is related to the lens. If it remains, the problem is related to the body (probably, the sensor).


Best regards
Alberts
08-31-2012, 02:05 AM   #4
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This is an easy one... Did you change lenses? If you changed lenses its the sensor, but it honestly looks like a spec on the front element of the lens, just by the way it looks, it looks like a hair, I've had a piece of a hair on my lens once and when I saw uploaded the images they looked exactly like that even with the curve, just like a hair curves... I've also had a dirty sensor and I know what that looks like, usually they are dark spots, that seems like a hair...

08-31-2012, 02:11 AM   #5
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It is a hair. Use the camera's sensor cleaning function (set it to activate whenever the camera is turned on, as a preventative measure).

If that doesn't work, rocket blower. (Do not blow on the sensor with your mouth or anything silly!)

If the rocket blower fails, you could try an arctic butterfly or a wet sensor cleaning kit. But the rocketblower is usually effective, and by far the cheapest easiest method.
08-31-2012, 02:12 AM   #6
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I'm pretty sure it's on your sensor. It's a speck of dust so small it's hard to see on the sensor surface with the naked eye. If it was on your lens, you'd see it in the finder, and the effect would be dependent on focusing.

Get a dust blower, remove the lens (try not to get more dust into the camera. I keep it with the lens mount facing down for the procedure.), set the camera in Sensor Cleaning, blow some air onto the sensor to dislodge it, turn of your camera to exit Sensor Cleaning mode (the shutter and mirror will reset. Don't touch.) and remount the lens. Should be fine.
08-31-2012, 02:27 AM   #7
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I've got almost the exact same thing, except my semi circle is higher up and doesn't go away with a lens change so it will be the sensor. I'm attempting a clean tonight.
08-31-2012, 04:03 AM   #8
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This is the hazard of having interchangeable lenses on your camera. Dust can get in. Most of the time, the cleaning methods outlined above will get rid of it. Sometimes you just have to get it cleaned in the shop.

08-31-2012, 04:35 AM   #9
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This reminds me of an old joke:

Patient: Everywhere i touch it hurts.
Doctor: Yeah your finger is broken.
08-31-2012, 06:11 AM   #10
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A Big Thanks

Hi guys,

Thanks for all your help. I'm going to try the rocket blower first. Then if pain persists, I'll see a doctor ;-)

Weird thing is I've never taken the lens off (new body and lens) and the wife has only even installed the lens. We've taken a few hundred shots, no hassles...
See how she looks after some love.

Big thanks once again. Very cool forum :-)

PS. Very happy with the K-30 to date.

Viele Gre,
Brendan
08-31-2012, 08:34 AM   #11
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It can be on the front, the back, or the inside of the lens. Inside is uncommon for new lenses, but can happen with very old lenses or lenses that have been repaired by amateurs.
It can also be on the sensor, which is very likely. Rocket blower will remove most dust and hair so try that first. There are other sensor cleaning tools out there, some easier to use and some harder to use.
08-31-2012, 08:36 AM   #12
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QuoteOriginally posted by grinnersinc Quote
Hi guys,

Thanks for all your help. I'm going to try the rocket blower first. Then if pain persists, I'll see a doctor ;-)

Weird thing is I've never taken the lens off (new body and lens) and the wife has only even installed the lens. We've taken a few hundred shots, no hassles...
See how she looks after some love.

Big thanks once again. Very cool forum :-)

PS. Very happy with the K-30 to date.

Viele Gre,
Brendan
Dust can exist in the mirror box, and then end up on the sensor. Just because you haven't changed lenses doesn't mean you didn't get dust in there. Generally, the closed shutter helps protect, but it's bound to get dust on it someday.

If the rocket blower doesn't work, I would suggest using the Eclipse wet cleaning system with the swabs. Gently, of course. Nothing has avoided it's removal powers on my k-x yet.
09-01-2012, 09:20 PM   #13
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I had a hair in my K20D once, here's a thread that helped.
09-01-2012, 10:09 PM   #14
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As most people mentioned, it's something on the sensor that should be removable with a rocket blower. Things like that are more visible at smaller apertures and in plain gray sky or plain areas.

Almost no dust, scratches or other blems in or on a lens will show up as they are just too far from the sensor.
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