Help / Advice needed

Just rekindled my interest in photography and new to this foum. I recently bought a secondhand K7, with around 2000 actuations on it. I took lots of snaps since receiving it and at the weekend I noticed a small dot with a small circle around it on all of the images taken with the sky or light background in it. The circle appears around 2 or 3mm in dia when an image is viewed on the computer screen. I went back to the original snaps taken when I received the camera and it appears on those images as well. I have taken the same snap with 2 different lenses and the blemish is still there. Can anyone shed any light on what the problem may be. I have tried contacting the seller but he has not responded yet.......

Thanks

Hi Wes (and welcome) - It may just be a bit of dust on the sensor. If you have the instruction book take a look at the section for sensor cleaning, but take care that you follow the advice properly. Usually locking the mirror up and gently blowing with a "Rocket" type blower is sufficient. You should also be able to do a "sensor check" to first see where the dust is.

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LennyBloke

Thanks for the response......I initially thought it may be a bit of dust but it is absolutely symmetrical, it resembles one of the 'check' boxes on ebay for example, where you click to accept something and a black dot appears inside a circle, although my problem is more of a pale grey rather than defined black.... I will check the sensor anyway to see if it resolves the problem.

Can you post an image so we can see the effect?

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Best regards, John

John,

How do I go about posting an image........... if you drop me an email address I could send one by

Wes

https://www.pentaxuser.com/forum/topic/how-to-post-images-6624

Don't know if this will work, here goes. The blemish is in the sky right had side

http://s1245.photobucket.com/albums/gg598/wes4390/?action=view¤t=IMGP7537_...

It is a littleclearer in this.......

http://s1245.photobucket.com/albums/gg598/wes4390/?action=view¤t=IMGP7455....

Dust!

As the rest of the sensor looks ok this is obviously something that the cameras dust removal can't shift, and as it's been there so long it's doubtful a rocket blower will help, you need to invest in some wet cleaners.

I doubt it's a fault with the sensor, the halo effect is a characteristic of dirt.

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My Names Alan, and I'm a lensaholic.
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Thanks for the help .......I have used a rocket blower this evening and will buy some wet cleaners tomorrow, any advice on a brand/type. I should say the only shop near to me is Jessops and are they relatively easy to use...........

I personally have never found Jessops very easy to use.....

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Flurble

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Although Jessops may stock these, they will advise you to get it cleaned 'professionally' (which basically means they do it for you and charge £40)!

You need something like this. Visible Dust are a very good brand. You might get cheaper, but don't buy too cheap as it may damage your sensor more than it cleans!

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Thanks again ..........will give it a go and see if it sorts out the problem