How does a scratch on Low Pass Filter looks like?


Nov 2, 2008
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9gag.com
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#1
Hi guys,

I recently tried to clean my sensor myself as i noticed some faint dust specks on my pictures. I did some self-diagnose - taking photo of a white screen, and then blah blah (not gonna type the entire thing) - when the supposely clean sensor actually is FULL of dust.

I googled on the how-to and gladly followed it faithfully, except when someone bumped onto my elbow while i was dedicately using cotton buds to rub off some subborn dust - i know what im doing, just read on.

Since then there is this really bright spot appearing at the same place everytime on my pictures. Did i just busted my low-pass filter?
 

daredevil123

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Oct 25, 2005
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lil red dot
#2
Hi guys,

I recently tried to clean my sensor myself as i noticed some faint dust specks on my pictures. I did some self-diagnose - taking photo of a white screen, and then blah blah (not gonna type the entire thing) - when the supposely clean sensor actually is FULL of dust.

I googled on the how-to and gladly followed it faithfully, except when someone bumped onto my elbow while i was dedicately using cotton buds to rub off some subborn dust - i know what im doing, just read on.

Since then there is this really bright spot appearing at the same place everytime on my pictures. Did i just busted my low-pass filter?
Can you post a sample pic with that bright spot here?
 

farbird

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Jan 14, 2004
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#3
remove lens from body, cover body with body cap.
go to a dark enclosed room,
select manual cleaning so mirror will flip up [ do "not" remove body cap at this moment ]
wait for 5 mins while mirror is flipped up and cmos exposed [ all while body cap is covering it ]
switch camera to off. [ mirror will flip down ]

try again to mount lens and take a few test shots to see if bright spot still there..
 

Sep 17, 2008
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#4
remove lens from body, cover body with body cap.
go to a dark enclosed room,
select manual cleaning so mirror will flip up [ do "not" remove body cap at this moment ]
wait for 5 mins while mirror is flipped up and cmos exposed [ all while body cap is covering it ]
switch camera to off. [ mirror will flip down ]

try again to mount lens and take a few test shots to see if bright spot still there..
eh if you are already having body cap on... why the need to go to a dark enclosed room?
 

edutilos-

Senior Member
Dec 28, 2010
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#6
It sounds like a bright pixel.

Nothing to do with the cleaning, but I'm not sure how you use the "cotton buds" to clean your sensor. I do so, but only for wet cleaning. I won't go out of my way to touch the sensor unnecessarily too.
 

edutilos-

Senior Member
Dec 28, 2010
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The Universe
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#7
remove lens from body, cover body with body cap.
go to a dark enclosed room,
select manual cleaning so mirror will flip up [ do "not" remove body cap at this moment ]
wait for 5 mins while mirror is flipped up and cmos exposed [ all while body cap is covering it ]
switch camera to off. [ mirror will flip down ]

try again to mount lens and take a few test shots to see if bright spot still there..
So what is this supposed to solve??
 

farbird

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Jan 14, 2004
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#8
I also unable to explain. Only know that I experienced this once and managed to resolve it.
 

Hanmin147

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Aug 20, 2011
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Tampines
#9
farbird said:
remove lens from body, cover body with body cap.
go to a dark enclosed room,
select manual cleaning so mirror will flip up [ do "not" remove body cap at this moment ]
wait for 5 mins while mirror is flipped up and cmos exposed [ all while body cap is covering it ]
switch camera to off. [ mirror will flip down ]

try again to mount lens and take a few test shots to see if bright spot still there..
Hey, I tried what you suggested but it doesn't work! Do I have to go to a dark room because I didn't. Thanks!
 

Nov 2, 2008
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9gag.com
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#10
hi guys, i have to revive this thread that i started, because im facing with the same issue now.
The reason i couldn't get back to the thread was because i couldn't get a sample photo as i sent my unit to Sony for their cleaning, which i forgot whether i paid - or was it free
Plus, i didn't get notifications of replies to my email by default.

Thanks for the warmth response.
---------------------------------------------------------------------------------------------------------------
I tried to clean just now with a sensor brush from Lenspen + hand blower FOC when i bought this unit.
Now after repeated attempts not only did the dust merely shifted locations but when i tried to take photo against my white wall at F36 inf focus lots of white specks appeared.

My tests to determine location of dust was done on white photoshop monitor, 2 photos are attached before and after. The photo of my white wall with the white specks are attached as well.
https://docs.google.com/file/d/0B2zV58XndaigNjR5bFNsXzlQYTg/edit?usp=sharing
https://docs.google.com/file/d/0B2zV58XndaigTVZzdTM2M3BMYTQ/edit?usp=sharing
https://docs.google.com/file/d/0B2zV58XndaigVUhYbkJ6QUFQYWs/edit?usp=sharing

Seriously did i do anything wrong with my brushing? How come my unit gets dust on sensor so frequently?
 

Last edited:

catchlights

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Sep 27, 2004
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#12
FYI,

dust spots will show up as darker dots.

white spots usually are hot pixels, it show up when you doing long exposure, this is normal.

white spots can be also dead pixel, it shows up at whatever exposure setting, this can be simply map out using software at your service center.



from the photos you shown, if the white specks is taken with a long exposure, than that is perfectly normal.

dust is everywhere, in the air you breathe, so it is perfectly common to have dust land on sensor, we just need to clean our sensor regularly, and we won't able to have 100% dust free sensor no matter how hard we tried, as long it won't show up in the images is acceptable, anyway, not every shot we will shoot on plain background with f32 right?


you can try the Copperhill Sensor Cleaning kit, http://www.copperhillimages.com/shopping/pgm-more_information.php?id=71
 

Nov 2, 2008
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9gag.com
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#13
FYI,

dust spots will show up as darker dots.

white spots usually are hot pixels, it show up when you doing long exposure, this is normal.

white spots can be also dead pixel, it shows up at whatever exposure setting, this can be simply map out using software at your service center.



from the photos you shown, if the white specks is taken with a long exposure, than that is perfectly normal.

dust is everywhere, in the air you breathe, so it is perfectly common to have dust land on sensor, we just need to clean our sensor regularly, and we won't able to have 100% dust free sensor no matter how hard we tried, as long it won't show up in the images is acceptable, anyway, not every shot we will shoot on plain background with f32 right?


you can try the Copperhill Sensor Cleaning kit, http://www.copperhillimages.com/shopping/pgm-more_information.php?id=71
awesome, thanks for the info.

do you recommend me sending my unit to Sony for their cleaning, and if my sensor does really has dead pixels, remap?
 

catchlights

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Sep 27, 2004
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#14
awesome, thanks for the info.

do you recommend me sending my unit to Sony for their cleaning, and if my sensor does really has dead pixels, remap?
if you find you are not competent to clean the sensor yourself, than bring it to Sony Service Center for sensor cleaning is a logical choice.

as for suspecting dead pixels, tell the technician about it, let them take a look, see what they find and any recommendation.
 

Nov 2, 2008
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9gag.com
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#16
if you find you are not competent to clean the sensor yourself, than bring it to Sony Service Center for sensor cleaning is a logical choice.

as for suspecting dead pixels, tell the technician about it, let them take a look, see what they find and any recommendation.
Never clean your own sensor if you feel that you're not up to the task.
will do. Thanks for the help guys :)
 

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