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marks on images, try different lens and still same place marks

decanem
Posted 31/10/2011 - 18:37 Link
top right of picture, the grey little circular marks...u cant miss them. the wall i took the pic off has no marks on it like that.

ive tried a few lens and the marks are on all.

link

i cant really remember this happened - i did go on holiday a while back and got a bit lax with my camera care....my fault entirely. lesson learnt

i followed a tutorial for cleaning the sensor but it didnt appear to help.

k100d
SteveEveritt
Posted 31/10/2011 - 18:39 Link
Mucky sensor, dust on it I'm afraid.
Flickr
"Life is what happens to you while you're busy making other plans" (John Lennon)
ChrisA
Posted 31/10/2011 - 19:02 Link
As Steve says, it's just muck on the sensor.

Occupational hazard. Search the forum for dust removal techniques.

It boils down to three options:

- A blower (hit and miss),

- A device called an Arctic Butterfly (Google it, or search the forum for it), which is great for dry dust that hasn't adhered to the sensor

- A sensor swab, with a few drops of cleaning fluid. This is the only way of removing some of the sticky particles such as pollen that stick and stick and stick.

The latter is the scariest-sounding, but it really isn't difficult, and since it's your kit and you'll be careful, the risk is IMO less than paying 35 quid or so for the privilege of having a spotty teenager in a random camera shop do it.

I hasten to add that of course, in some camera shops, even the spotty teenagers are highly trained, competent individuals. Those ones will be fine, but arguably no better at cleaning sensors than yourself.
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Edited by ChrisA: 31/10/2011 - 19:10
decanem
Posted 31/10/2011 - 19:19 Link
ok thanks for the help. i will do some looking into sensor cleaning - i have a blower and some cleaning fluid and swabs....i must be brave!

cheers for your input - i didnt want to go and play inside there without being totally sure i was doing the right thing...

will i be able to actually see these blobs on the sensor? with the naked eye?
ChrisA
Posted 31/10/2011 - 19:24 Link
decanem wrote:
will i be able to actually see these blobs on the sensor? with the naked eye?

Quite likely not.

Swab; picture of blank white wall at F22; crank up the contrast.

Repeat till you're satisfied, or bored.

Just make sure the battery's nice and full. It's not likely, but it could ruin your whole day if the juice ran out and the mirror flipped down while you were poking about in there.
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Edited by ChrisA: 31/10/2011 - 19:39
Eagle12
Posted 01/11/2011 - 09:55 Link
decanem wrote:
ok thanks for the help. i will do some looking into sensor cleaning - i have a blower and some cleaning fluid and swabs....i must be brave!

cheers for your input - i didnt want to go and play inside there without being totally sure i was doing the right thing...

will i be able to actually see these blobs on the sensor? with the naked eye?

I wet cleaned the sensor on my *istDL 2 days ago and like you I was a bit apprehensive, (that's a big word that means scared), but it was easier than I thought. As long as you make sure that you have fresh batteries in so that the mirror doesn't suddenly drop as ChrisA said, you should be OK. And do it gently, better to do it several time gently than go hard at it once and do damage.
Edited by Eagle12: 01/11/2011 - 09:56
ChrisA
Posted 01/11/2011 - 10:20 Link
This video from the people that make Eclipse fluid should de-mystify the procedure:

http://www.youtube.com/watch?v=67vLGotCFd0
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Eagle12
Posted 01/11/2011 - 10:44 Link
That's the very one that I looked at before I plucked up the courage to do mine
ChrisR
Posted 01/11/2011 - 11:55 Link
ChrisA wrote:
This video from the people that make Eclipse fluid should de-mystify the procedure:

http://www.youtube.com/watch?v=67vLGotCFd0

Good little video clip, but he broke the cardinal rule of cleaning most items.
You do not wipe the cleaning medium back across the item being cleaned.


Take care.
Chris R.

I. El. (Eng). (Rtd).
ChrisA
Posted 01/11/2011 - 14:49 Link
ChrisR wrote:
You do not wipe the cleaning medium back across the item being cleaned.

Indeed, but actually he didn't. For the return wipe, he bent the swab the other way, and used the other side.
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
.
ChrisR
Posted 01/11/2011 - 15:28 Link
ChrisA wrote:
ChrisR wrote:
You do not wipe the cleaning medium back across the item being cleaned.

Indeed, but actually he didn't. For the return wipe, he bent the swab the other way, and used the other side.

Yes, I appreciate that, and I donít have any experience cleaning camera sensors , but did spend my whole working life from fifteen to sixty five in industrial electrical engineering, and thatís how it struck me.

I can remember my early apprentice days, being told not to wipe back over a cleaned item, and in those days you were only told once, if there was a second time, you would feel your ear stinging, from your masters hand.

Having said that, I had a good master, he always carried a flask of rum in the winter, for a tot in our tea. Those were the days.

Take care.
Chris R.

I. El. (Eng). (Rtd).

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