Have dark dot on top of all my pictures (multiple lenses)

mojoe_24 · 09-08-2011, 04:40 PM

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?

**crewl1** · 09-08-2011, 04:43 PM

Could be sensor dust that is accentuated with smaller apertures. Can you show us a sample?

hcc · 09-08-2011, 06:13 PM

Sensor dust or dead pixels.

Please post an example.

Ole · 09-08-2011, 06:33 PM

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.

abacus07 · 09-08-2011, 06:34 PM

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.

mojoe_24 · 09-12-2011, 02:05 PM

Well, my computer broke recently so I can't upload images. But I have a K-x. Would that have a dust removal functin?

alohadave · 09-12-2011, 04:36 PM

Originally posted by mojoe_24

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.

stevebrot · 09-13-2011, 07:11 AM

Originally posted by mojoe_24

Well, my computer broke recently so I can't upload images. But I have a K-x. Would that have a dust removal functin?

Originally posted by alohadave

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

mojoe_24 · 10-13-2011, 07:45 PM

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.

abacus07 · 10-13-2011, 08:04 PM

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).

mojoe_24 · 10-14-2011, 03:27 AM

I've been meaning to buy a rocket blower, so I guess this gives me a reason to.

Klaus · 10-14-2011, 03:57 AM

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

Nass · 10-14-2011, 04:07 AM

I use visibledust wet sensor clean with those brush things and it does a totally perfect job for me.

mojoe_24 · 10-14-2011, 10:47 AM

Well, I'm ordering a rocket blower today. Hopefully that will solve my problem.

kh1234567890 · 10-16-2011, 03:22 PM

Just remember that the dust blob will be at the bottom of the sensor if it appears at the top of the shot.

09-08-2011, 04:40 PM	#1
mojoe_24 Senior Member Join Date: Nov 2010 Posts: 241	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?

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09-08-2011, 04:43 PM	#2
crewl1 Site Supporter Join Date: Jul 2010 Location: Los Angeles, CA Photos: Gallery \| Albums Posts: 9,807	Could be sensor dust that is accentuated with smaller apertures. Can you show us a sample?

09-08-2011, 06:13 PM	#3
hcc Pentaxian Join Date: Nov 2009 Location: Brisbane, Australia Photos: Gallery \| Albums Posts: 4,002	Sensor dust or dead pixels. Please post an example.

09-08-2011, 06:33 PM	#4
Ole Administrator Join Date: Sep 2006 Location: Copenhagen, Denmark Photos: Gallery \| Albums Posts: 4,408	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
abacus07 Veteran Member Join Date: Oct 2010 Location: Taiwan Photos: Gallery \| Albums Posts: 1,075	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
mojoe_24 Senior Member Join Date: Nov 2010 Posts: 241 Original Poster	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
alohadave Veteran Member Join Date: Jan 2008 Location: Quincy, MA Photos: Gallery \| Albums Posts: 2,024	Originally posted by mojoe_24 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
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by mojoe_24 Well, my computer broke recently so I can't upload images. But I have a K-x. Would that have a dust removal functin? Originally posted by alohadave 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
mojoe_24 Senior Member Join Date: Nov 2010 Posts: 241 Original Poster	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
abacus07 Veteran Member Join Date: Oct 2010 Location: Taiwan Photos: Gallery \| Albums Posts: 1,075	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
mojoe_24 Senior Member Join Date: Nov 2010 Posts: 241 Original Poster	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
Klaus Senior Member Join Date: Jan 2010 Location: Murcia, Spain Photos: Gallery Posts: 100	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
Nass Veteran Member Join Date: Aug 2009 Location: The British Isles Photos: Gallery Posts: 2,402	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
mojoe_24 Senior Member Join Date: Nov 2010 Posts: 241 Original Poster	Well, I'm ordering a rocket blower today. Hopefully that will solve my problem.

10-16-2011, 03:22 PM	#15
kh1234567890 Veteran Member Join Date: Sep 2010 Location: Manchester, UK Photos: Gallery Posts: 2,653	Just remember that the dust blob will be at the bottom of the sensor if it appears at the top of the shot.