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09-08-2011, 04:40 PM   #1
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Have dark dot on top of all my pictures (multiple lenses)

I have dark dot on the top middle of my pictures. I've used my 15-55 and 50-200 (kit) lenses and both have them. However, when I use my 50mm (manual focus) it doesn't have any. What could be the problem?

09-08-2011, 04:43 PM   #2
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Could be sensor dust that is accentuated with smaller apertures. Can you show us a sample?
09-08-2011, 06:13 PM   #3
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Sensor dust or dead pixels.

Please post an example.
09-08-2011, 06:33 PM   #4
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It sounds like you have dust on the sensor. If your camera has a dust removal function, run it a number of times and check if the dust is gone. If not, then the next step is a rocket blower like this one - it can remove most dust specks:

Giottos Rocket Air Blower - (Large) 7.5"

The camera manual explains the sensor cleaning process (how to flip the mirror up and keep the shutter open) so that you can blow the dust off. Only use a blower as shown, never compressed air from a can. The latter would leave residue on the sensor and then professional cleaning will be required.

If the blower cannot do the job other methods like wet cleaning are available, or you can have a camera repair shop clean the sensor.

09-08-2011, 06:34 PM   #5
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Sensor dust. Dead pixels are tiny and red or green IIRC.

One of the joys of owning an interchangeable lens camera.

A picture would confirm this.
09-12-2011, 02:05 PM   #6
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Well, my computer broke recently so I can't upload images. But I have a K-x. Would that have a dust removal functin?
09-12-2011, 04:36 PM   #7
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QuoteOriginally posted by mojoe_24 Quote
Well, my computer broke recently so I can't upload images. But I have a K-x. Would that have a dust removal functin?
Yes, the instructions are in your manual.
09-13-2011, 07:11 AM   #8
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QuoteOriginally posted by mojoe_24 Quote
Well, my computer broke recently so I can't upload images. But I have a K-x. Would that have a dust removal functin?
QuoteOriginally posted by alohadave Quote
Yes, the instructions are in your manual.

If the dust removal function does not do the trick, a rocket blower is your best option. See your manual for instructions on how to open the shutter for sensor cleaning mode. Take care to not touch the sensor. On a similar note, leave wet cleaning (you can get kits) as a last resort.


Steve

10-13-2011, 07:45 PM   #9
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So I finally was able to fix my computer. I did the dust knock thing and I thought it worked, but I took shots recently at the beach adn it was still there (in the same place too). here is a shot I took to demonstrate the spot. Up at the top.

10-13-2011, 08:04 PM   #10
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The next step is using a rocket blower as described above. Personally I find the camera dust removal option rarely effective. the rocket blower is almost always effective. And if that doesn't work you can buy the wet cleaning kit ($40ish).
10-14-2011, 03:27 AM   #11
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I've been meaning to buy a rocket blower, so I guess this gives me a reason to.
10-14-2011, 03:57 AM   #12
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If the blower doesn't do the job, I would get the Pentax cleaning kit. It is easier to use and more secure then the wet methods. And it is effective.
Cheers - Klaus
10-14-2011, 04:07 AM   #13
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I use visibledust wet sensor clean with those brush things and it does a totally perfect job for me.
10-14-2011, 10:47 AM   #14
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Well, I'm ordering a rocket blower today. Hopefully that will solve my problem.
10-16-2011, 03:22 PM   #15
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Just remember that the dust blob will be at the bottom of the sensor if it appears at the top of the shot.
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