ham888
member
Reged: 11/06/2008
Posts: 193
Loc: Worcestreshire
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Hi
Noticed some marks on some of my pics - like very small out of focus circles. They are most noticable on shots of the sky ~ i.e grey or blue.
Have a rocket blower, took off lens, cleaned all I can used blower, did mirror lock-up used blower, they seemed to go after some test shots. However, today they are back?? havn't taken lens off between times.
Also I have done a test where I take the same shot on continuous shooting (just blank, featureless sky) - marks are there on some, not or moved on others.
I assume its dust.
Any advice welcome
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Harry
My Flickr
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alanS
Dr Dust
Reged: 30/09/2005
Posts: 3633
Loc: Up North, England.
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Sounds like contamination, more likely to show up at smaller apertures too.
If you've tried a Rocket blow out without too much success I'd be tempted to give the chamber a good blow out and them try blowing the sensor again. If you're still getting contamination after that you may need to do a contact clean with swabs and fluid.
You don't have to wait for a blue sky to do a test, just take an out of focus photograph a piece of white paper at minimum aperture and you should see any contamination present. When doing a contact clean remember that any contamination towards the top of the shot will be towards the bottom of the sensor, and any towards the bottom of the shot will be towards the top of the sensor. Right and left remain right and left.
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Alan's defence lawyer claimed that "Booze played no part in his typo's."
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ham888
member
Reged: 11/06/2008
Posts: 193
Loc: Worcestreshire
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Thanks Alan, just took a pic of a piece of white paper at min aperture - oooch, more spotty than a spotty thing!
Now am I correct in my assumption that the sensor at the back is the ONLY thing that can cause spots on shots - i.e not the mirror and/or the viewfinder. I've been cleaning these with lens cleaner but am afraid to touch the sensor. It says to be cleaned ny Nikon peeps only in the manual.
Thanks
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Harry
My Flickr
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alanS
Dr Dust
Reged: 30/09/2005
Posts: 3633
Loc: Up North, England.
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Any contamination on the lens would need to be pretty extreme, I think. Contamination on the mirror of focus screen may be visible through the viewfinder but will not appear on your shots. I'd recommend that you do not touch the focus screen or if you do proceed with extreme care. Same with the mirror.
When you clean your sensor you're not actually cleaning the sensor but a filter in front of it. as long as you take care you should have no problem. The swabs and fluid are designed to clean this sensor / filter, that's what they are for. I've cleaned my "sensor" many times without causing damage. make sure there's plenty of charge in your battery before starting though, you don't want the shutter closing.
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Alan's defence lawyer claimed that "Booze played no part in his typo's."
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El Sid
Going potty
Reged: 14/04/2003
Posts: 9437
Loc: Sussex-by-the-Sea
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I'd just keep blowing the cack out for the time being. You have a new camera and it's likely generating it's own dust - it's surprising what may fall out of nooks and crannies and foam damping and the such like. Only when you get a spot (or several) that persist in the same place is it worth a physical clean.
And no, spots on the mirror and finder don't appear on your images. I would also advise that you don't attempt to physically clean these items as they are both delicate and easily marked or damaged.
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Nigel
Completely BSRIPN 
ElSid Gallery
A camera in the hand is better than one in the cupboard........
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ham888
member
Reged: 11/06/2008
Posts: 193
Loc: Worcestreshire
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OK, gonna give the body another blast later.
If i need to clean the sensor (or filter over) then do I need something special or will lens cleaner do?
Thanks
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Harry
My Flickr
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Hotblack
Dead Horse Flogger
Reged: 07/03/2006
Posts: 7287
Loc: Upstairs in the spare room.
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IF you need to clean the sensor then don't use lens cleaner. Use Eclipse Fluid and sensor swabs. Make sure you get the correct size swab for your sensor. Warehouse Express sells them, amongst other places.
In the meantime, when you use the rocket blower on the sensor, hold the camera with the throat facing down so that any dust drops out of the mirror box and doesn't re-settle elsewhere inside.
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Cheers
David
David J White Photography
Edited by Hotblack (14/07/2008 20:56)
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ham888
member
Reged: 11/06/2008
Posts: 193
Loc: Worcestreshire
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OK, ordered swabs & fluid.
STAND BACK Im going in!
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Harry
My Flickr
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ham888
member
Reged: 11/06/2008
Posts: 193
Loc: Worcestreshire
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OK, cleaned the low pass filter / sensor, seems to have worked well. All thats left is the odd (<3 or so) very small mark on the extremities which can only be seen with smallest aperture and adjusting the brightness PP to be able to see them.
Thanks for you help
I now have a question regarding dust off ref photo. I will start a new post here so please take a look
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Harry
My Flickr
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le_r_s36
journeyman
Reged: 06/09/2007
Posts: 50
Loc: North Kent, England, UK
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I've just started to notice a dust spot, only one i can see, when viewing a sky shot.
It's not the lenses, defiantely. Obviously, it's in camera. Reading the above posts, i've got an idea, but, how do you keep the mirror up.
Thanks,
Liam. 
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Formally Known As lshears12
http://www.flickr.com/photos/le_r_s36/
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ham888
member
Reged: 11/06/2008
Posts: 193
Loc: Worcestreshire
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Quote:
I've just started to notice a dust spot, only one i can see, when viewing a sky shot.
It's not the lenses, defiantely. Obviously, it's in camera. Reading the above posts, i've got an idea, but, how do you keep the mirror up.
Thanks,
Liam.
Presuming you have a D80.
In the menus there is a "mirror lock up" setting, select this, press the shutter and up it goes. However, it will only work if you have a good battery charge.
Its in the manual.
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Harry
My Flickr
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Adesw
The phantom flasher
Reged: 07/02/2008
Posts: 712
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Also remember, that after locking up the mirror, do not remove the lens for 30 or so seconds. Because the sensor remains static for a short period of time after being "turned off"
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ham888
member
Reged: 11/06/2008
Posts: 193
Loc: Worcestreshire
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Top tip there Adesw, didn't know that. Maybe thats why I'm getting an issue with dust as I generally turn off then whip the lens off straight away, when changing lenses and the like.
Maybe I should wait 30 secs.
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Harry
My Flickr
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