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Dirty SL sensor - what can I do? Is wet cleaning permitted?


wlaidlaw

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Keith, 

 

I too have an Eye-Lead stamping tool. However, I found on very close examination with an illuminated sensor loupe, that it was leaving very faint lines at the edge of each sticky head application, like a chequer board. Now I don't know if this was sticky residue or where it had pushed the dust into a line but you could see it. I do still use it as I think it is the best way to remove dust, some of which under a microscope, will look like jagged rocks, before wet cleaning. The faint lines clean off very easily on the M8/9/240 with Eclipse, Ethyl Alcohol or IPA and on the SL with Visible Dust "Smear Away". 

 

Wilson

Hi Wilson,

 

I must admit I never use a loupe to examine the sensor glass but rather rely on 100% magnification in PS of full test image frames shot at f16. It's possible there are the residues you report, although I've never seen them, but I base my examination on the principle of 'what the eye doesn't see the heart doesn't grieve over'. If it's not on my test images it's of no concern, at least to me. 

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I used stamping tools for a while (Visible Dust, I think, but don't remember) till I got a bit careless, moved the stamp sideways, and made a mark I couldn't remove. Leica Mayfair cleaned it. but since them I use alcohol swabs (they work on humans as well, if you apply enough alcohol).

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Interesting that after just a few months, my SL's sensor needs cleaning. After close to 3 years, my Olympus EP-5's sensor is still clean, when I did a test at the end of last year. Apparently Olympus patented the most effective method called the Super Sonic Wave Filter (SSWF) in 2003, using multiple piezo transducers and other camera makers have had to use less effective methods of ultrasonic cleaning. The Olympus method is described as vibrating the sensor cover glass in such a way that it is like shaking a table cloth to get all the crumbs off, where a wave travels across the cloth and flicks all the crumbs off. 

 

Wilson

Olympus has a fail-proof system of dealing with sensor spots:  Consists basically on a 4mm. thick filter stack, meaning that dust, or sticky particles. stays away enough from the photosites to ensure that everything, but giant dust spots, is blurred and invisible at normal apertures. Dust is there but you can't see it. That's Olympus magic, for sure... :rolleyes:

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I used stamping tools for a while (Visible Dust, I think, but don't remember) till I got a bit careless, moved the stamp sideways, and made a mark I couldn't remove. Leica Mayfair cleaned it. but since them I use alcohol swabs (they work on humans as well, if you apply enough alcohol).

 

I find leaving the ethyl alcohol swabs soaking in tonic as you use each one, results in dual usage  :)

 

Wilson

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  • 3 weeks later...

Call me a wuz, but I'm terrified of cleaning my sensor.

 

Regards

Peter

 

 

Today I plucked up courage, took a deep breath and, with all your good advice in my head, I cleaned my sensor.

 

My SL sensor had about 5 round spots and one smeary looking blob.  One of the spots looked like Saturn - an inner dot surrounded by a ring.  In real-life images they only showed up in dim, grey skies, imperceptible in blue sky.  But, I just didn't like knowing that the spots existed.

 

I bought the Visible Dust 24mm orange swabs and the VDust Plus cleaner.  I already owned a filtered blower but I also bought a sensor loupe with LED lights.

 

First I puffed away some small pieces of dry dust.

 

The first left-then-right swipe with the wet swab removed nearly all the spots but I could still see some remnants of the smear.  A new swab then one more pass and it was gone.

 

I have just studied an f22 before and after comparison under-exposed DMG in LR and the sensor is spotless.  Yeah!

 

As I rarely take off the weather-sealed 24-90mm lens (only when I want to use the WATE to go really wide), I am hoping that it'll stay clean for a while.

 

Thanks for all your advice.

 

Regards

Peter

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