Olympus UK E-System User Group

Olympus UK E-System User Group (https://e-group.uk.net/forum/index.php)
-   Olympus OM-D E-M5 Mark II (https://e-group.uk.net/forum/forumdisplay.php?f=68)
-   -   Dust!!!! (https://e-group.uk.net/forum/showthread.php?t=47736)

jdal 22nd April 2018 03:22 PM

Dust!!!!
 
:mad: Would you look at the dust bunnies in this:

http://e-group.uk.net/gallery/data/2044/P4220017.jpg

Obviously dependant on which lens/aperture, this is with the 60mm macro, many of them are the same with the 75mm so it's not some muck in the lens. It makes me wonder if the sensor cleaning is broken.

MJ224 22nd April 2018 05:23 PM

Re: Dust!!!!
 
Maybe you can clean the sensor yourself. I did with a special tool kit on my Pentax Ist years ago...

Was simple and I think effective.................*chr

jdal 22nd April 2018 05:59 PM

Re: Dust!!!!
 
If I had an old Pentax I'd give it a go. I successfully cleaned my mates Canon 1D years ago, but neither of those have a sensor held in place by 5-axis stabilisation! It's over 3 years old, I think I'll send it off to Luton Cameras for a check up & service. They did my Mk1 and it came back transformed.

Ricoh 22nd April 2018 07:52 PM

Re: Dust!!!!
 
F/16 shot against a homogeneous background, defocussed, is the way I check for sensor contamination. The Oly is good for cleaning anything that can shake clear, but sticky stuff is a different order of challenge.
5-axis or not 5-axis, a wet clean using a suitable sensor cleaning product should be risk free.

pdk42 22nd April 2018 08:36 PM

Re: Dust!!!!
 
I often hear people claiming that the Olympus SSWF is so good that they never need to clean their sensor, even after years of use. That's not my experience at all. I find that although Olympus cameras do better than some other makes, sensor dirt will everyday rear its head and a wet clean will be needed.

In fact, I'm not even sure if it's the SSWF that makes Olympus cameras less susceptible to dirt, or whether it's a question of the effects being less noticeable due to the relatively thick sensor stack combined with the fact that we usually shoot our lenses at apertures of f5.6 or wider.

Cleaning Olympus sensors isn't, IMHO, something that needs professional outsourcing. I've cleaned all of my cameras since I first got into digital photography, including all my m43 Olympus gear, and am yet to have any negative side effects from doing so.

jdal 22nd April 2018 08:45 PM

Re: Dust!!!!
 
Ok, cheers, I'll give it a shot. Do you guys have any recommendations as to the equipment?

MJ224 22nd April 2018 08:52 PM

Re: Dust!!!!
 
Quote:

Originally Posted by jdal (Post 445680)
If I had an old Pentax I'd give it a go. I

I don't have an old Ist, I cleaned it 15 years ago..........................

But what has changed since then?? A sensor clean is a sensor clean. Sponge and the appropriate cleaning fluid. Still like cleaning your windscreen properly.

Hey ho, you local camera shop will do the job for a fee........................*chr

jdal 22nd April 2018 09:03 PM

Re: Dust!!!!
 
Quote:

Originally Posted by MJ224 (Post 445692)
I
But what has changed since then?? A sensor clean is a sensor clean. Sponge and the appropriate cleaning fluid.

An immovable sensor vs a sensor mounted in a very precisely engineered moveable mount is what.

MJ224 22nd April 2018 09:09 PM

Re: Dust!!!!
 
Quote:

Originally Posted by jdal (Post 445699)
An immovable sensor vs a sensor mounted in a very precisely engineered moveable mount is what.

Sorry don't want to be argumentative..................

You would be cleaning the sensor, not the machinery behind it!!

But if you want certainty, go to a photo shop *chr*chr

pdk42 22nd April 2018 09:40 PM

Re: Dust!!!!
 
Quote:

Originally Posted by jdal (Post 445690)
Ok, cheers, I'll give it a shot. Do you guys have any recommendations as to the equipment?

This is what I do:

Ingredients:

- SensorSwab Type 2 swabs. They're 17mm across so will fit the width of m43 just fine (m43 is 17.3mm x 21.6mm).

- Eclipse cleaning fluid. It's basically purified methanol (so will evaporate quickly and will leave no residue).

Before shot:

- Take a shot of a plain white surface with the lens defocused and at f16 or f22. Take a look - you'll be horrified at the gunk you'll see (but remember this is a worst-case scenario, you'll never see it this bad in real shots).

Cleaning:

- I put the camera on its back and ensure it's turned off. I think turned off is better for two reasons - (a) you won't be fighting the IBIS; and (b) there is no risk of you inadvertently pressing the shutter release. If the shutter fires whilst there is an obstruction in the way, you'll wreck the shutter. I've heard others say that you should leave the camera on since the IBIS will stop the sensor from moving. This may be true (but I've never tried), but I can't help feeling that the forces you can apply with a cleaning pad are likely to significantly exceed what might occur due to camera movement.

- Prepare the swab as per the instructions (a few drops of fluid - enough, but not too much).

- Carefully put the swab at the top of the sensor and with it inclined at a slightly acute angle towards the bottom of the sensor (say about 70 degrees to the vertical).

- Carefully swipe the sensor from top to bottom, being careful not to put too much pressure on it. I generally find that the sensor will not move if you're gentle enough.

- When you get to the bottom, tilt the swab back such that it's now at an acute angle towards the top of the sensor.

- Carefully swipe back to the top of the sensor.

- At the top, remove the swab.

- Wait for any fluid to evaporate (methanol is very volatile so it should evaporate almost instantly).

After shot


Repeat the test shot again. You should find it a lot better. I doubt it'll be 100% perfect. Some remaining spots are normal but if any big ones remain, then repeat the cleaning. I sometimes re-use the same swab, but if you're paranoid you'll get a new swab for each swipe.

Hope that helps!

Ricoh 22nd April 2018 11:20 PM

Re: Dust!!!!
 
I read some advice to get fresh Eclipse; apparently over time the alcohol degrades the plastic bottle potentially resulting in desolved plastic in solution. When the alcohol evaporates the plastic stuff remains leaving a white film on whatever it is you clean, lens or sensor.
How true I'm not sure. I'm not a chemist.

jdal 23rd April 2018 05:35 AM

Re: Dust!!!!
 
Quote:

Originally Posted by MJ224 (Post 445700)
Sorry don't want to be argumentative..................

You would be cleaning the sensor, not the machinery behind it!!

But if you want certainty, go to a photo shop *chr*chr

It was the force you use when cleaning that I was worried about, you are putting some pressure on the sensor, both sideways and "vertically" which is being absorbed by the IBIS mounting. But since others have managed ok, clearly this isn't an issue.

MJ224 23rd April 2018 07:01 AM

Re: Dust!!!!
 
http://e-group.uk.net/gallery/data/5...2_Medium_.jpeg

Came with a shaped sponge on a stick, and instructions.

Was easy to do, with care and caution as Paul has explained.........Good luck..*chr

pdk42 23rd April 2018 07:42 AM

Re: Dust!!!!
 
Quote:

Originally Posted by Ricoh (Post 445704)
I read some advice to get fresh Eclipse; apparently over time the alcohol degrades the plastic bottle potentially resulting in desolved plastic in solution. When the alcohol evaporates the plastic stuff remains leaving a white film on whatever it is you clean, lens or sensor.
How true I'm not sure. I'm not a chemist.

I'd not heard that. A quick bit of Googling reveals little, although I did find an abstract of some research in using methanol to de-polymerise PET (which is the most commonly-used plastic for bottles). This is what it said:

Quote:

The degradation of polyethylene terephthalate (PET) in supercritical methanol was investigated with the aim of developing a process for chemical recycling of waste plastics. A batch reactor was used at temperatures of 573–623 K under an estimated pressure of 20 MPa for a reaction time of 2–120 min. PET was decomposed to its monomers, dimethyl terephthalate and ethylene glycol, by methanolysis in supercritical methanol. The reaction products were analysed using size-exclusion chromatography, gas chromatography–mass spectrometry, and reversed-phase liquid chromatography. The molecular weight distribution of the products was obtained as a function of reaction time. The yields of monomer components of the decomposition products including by-products were measured. Continuous kinetics analysis was performed on the experimental data.
But - that's a reaction at 20,000 atmospheres of pressure and 300 degrees C!

I doubt there's much in the claim that PET will dissolve in methanol at STP.

jdal 23rd April 2018 07:51 AM

Re: Dust!!!!
 
Hmmm...
Thanks for all this info, it's very helpful. *chr

I'm happy to do this myself but the best price I can find for 12 SensorSwabs + fluid is 66 :eek:. I imagine I could get it cleaned for 30 ish.

However I also have an E-M5mk1 which may need cleaning at some stage. The question is how often would I need to clean these? Since I got my first E-M5 6 years ago I've noticed one pollen spot on the Mk1 and now this on the Mk2. I can reduce this frequency even more by using the 2 bodies - it reduces lens swapping by a huge amount.

I'll check the local stores and see what they charge then decide.


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