I know there have been a lot of posts on this topic, but I haven't found exactly what I am looking for.

I noticed some dust spots on my sensor for my D750 after I took a picture with some sky in it and then was playing around with "dehaze" in Lightroom. Okay no problem, I have owned the camera for a year probably time to clean the sensor.

So I do a bit of research online and land on the fact that I can do this myself. I also want to learn how so I don't need to spend $50 or $75 each time I need this done. I decide to buy this kit.

What I do is close my aperture down to F22, put my ISO on 100 and then set my shutter speed to 2 seconds or so and take a picture of a well lit white piece of paper.

I then go into Lightroom and jack the dehaze and look for dust spots. I see a ton. Okay, so now let's clean it. I wet the swab with a few drops to get it just saturated on the top of the swab, apply some pressure, wipe left to right, turn it over, wipe right to left and done.

Then I took the same picture and although the dust spots are different, they are still there! What the heck? Okay maybe it just needs a good blow out. I took my rocket blower and blow out everything I can inside of there, then I do the same cleaning method as the first time, except this time I start with a dry swab, throw it out, then get a new swab, wet it and clean it again.

I take the picture again... and they are STILL THERE. Okay let's get out the high power flashlight. I wouldn't say I scrubbed it, but I went back and forth with the swab on what seemed to be a stubborn spot (I know, sketchy). Then I clean it again with a normal swab and take another picture.

This went on and on and I have basically ran out of swabs. I still see spots. I used the same swab a few times (I know, also sketchy) because I just couldn't figure out why it wasn't getting clean. I even tried a can of air (although some don't recommend that because they have solvent in them, but I was desperate and some people on youtube did it). That actually seemed to help, but in the end I still have spots.

So obviously a lot of you will tell me to just "take it in! you're going to break your sensor", but I really want to learn how to do this. And now I am just stubborn.

The spots are at the top and bottom of the frame mostly.

Any ideas? I ordered this gel stick today, and I was going to try it out very carefully. I also ordered more swabs.

Photos of the sky F22, ISO-100, 1 second

enter image description here
enter image description here

EDIT: I tried the gel stick. It did seem to help, but on the second try something else got on the sensor so I am going to wait until tomorrow to get the swabs and then try to do a swab cleaning + the gel stick again... we will see.

EDIT2: Well it looks better. I think the gel sticky stick helped but it's still not spotless. I ran over it one more time. I also included a photo above to the people are nervous about cleaning their own sensor. Obviously I can't guarantee you won't screw up, but I ran a swab over this sensor at least 15 times and it still shots great.

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    Can you post one of your white photos? – scottbb Oct 20 '18 at 18:03
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    Thanks for the photos. Next question, this is the equivalent to "did you take off the lens cap?": just for clarity's sake, you are cleaning the sensor, and not the mirror, right? =) – scottbb Oct 20 '18 at 18:24
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    Haha.. yes. I lock up the mirror when cleaning it. Although I did clean the mirror too with a left over swab. – chantheman Oct 20 '18 at 18:29
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    The front silvered surface of the mirror is much more fragile than the filter stack in front of your sensor. You should never touch the mirror with anything. Even though any damage may not be visible, removing any of the silvering from the surface will reduce the reflectivity of the mirror and will affect the amount of light reaching your camera's light meter, which is located above the focusing screen in the same area as the viewfinder prism. If there is dust on your mirror, gently blow it off with a bulb blower. – Michael C Oct 20 '18 at 18:59
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    Probably a stupid question on my part, but are you sure the lens you're using to test this is clean? They do look more like sensor spots, admittedly, but if you have crap on your rear element it might look similar. – Alex Oct 21 '18 at 9:43

Unless you are working in a NASA grade "clean" room, no matter what method you use you will almost never get every single dust spot. Even if you do, by the time you put a lens back on the camera, more dust has probably made its way into the mirror box of your camera and some of it may eventually find its way onto the surface of the filter stack in front of the sensor. The front of the filter stack is what is cleaned when we use an air blower, swabs, etc. on our camera's 'sensor'. So the point of sensor cleaning is not so much to get a 'perfect', dust free result as much as it is to reduce the amount and influence of dust on your images to a minimum achievable level.

When I clean one of my sensors I take test images after each pass with a swab. After early attempts to get every single spot and going through several swabs, similar to what you relate in the question, I've learned to 'quit while ahead' even if there are still a few light dust spots remaining. The next pass at that point may well result in more dust spots showing than remained after the previous attempt.

Before I use the first swab, I'll often try several clean/test cycles with the air blower. If none of the spots are staying in the same location on the sensor, I won't even use a swab. I'll just continue to use an air blower until I get a test image that gives a result that reaches the level of 'as good as can be expected'.

Corners are always the most difficult to clean with a wet swab. It takes a bit of practice to learn how to use the edges of a swab to clear out each corner by slightly rotating the stem of the swab back and forth at the end of a pass. But based on my experience, doing it yourself will never result in a perfect result with zero dust. Based on the experience of others I've talked with, neither will dropping the camera off at a local camera store and paying them for cleaning the sensor.

I've never shipped a camera to a factory service center to have a sensor cleaned. Maybe some of them have methods that can get a near perfect result. The cleaner environment in which they work on cameras and lenses certainly can't hurt.

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    Awesome. I was hoping for this answer. I will give it one more clean tomorrow and then stop fretting about it. I honestly thought I was just doing something wrong, but it's good to hear "perfection" may not be achievable. – chantheman Oct 20 '18 at 20:18

Agreed. It’s good to hear others experiencing the same issues. I, at first, made my Nikon D850 worse with the 24mm cleaning swab. However, after seeing the dust move about a bit after cleaning a few more times, I decided to use a brand new micro-fibre cloth and use the full width (24mm) cleaning swab. It got much better. After several hours of attempting to get everything, every single spot with both wet and dry swabs - as well as some dust under some area I just can’t seem to reach - even after removing and cleaning the viewfinder - I finally accepted the fact one or two dust particles (which can’t be noticed unless really looking at light sky images) are acceptable... and I’m a perfectionist.

I have approximately a dozen lenses for various scenarios. I hate to ever “settle” for anything less than perfect (hence, the various lenses). I change lenses often and do my utmost to cover any open internals instantly... but I’ve accepted the fact it is as good as it’s going to be practical to get. I’m sure I’ll get “every spec” one day - but as long as they don’t interfere with the vast majority of your images, the times they do become an issue lend opportunities to practice your Photoshop/Lightroom skills.

One thing I might recommend is (if you have a hand-squeezed blower (like a bulb-blower), try removing the (red? - color may vary) tube from the bulb. It may help you get air more directly into the internals without actually inserting the platic tube into the internals and (potentially) damaging the mirror or sensor.

Good luck!

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If you want a chance at getting your sensor "clean"...

  1. Filter the air. Your "better" image after 15+ cleanings still contains a lot of dust specks, so it seems you are working in a very dusty environment, whether you realize it or not. Despite that, I personally wouldn't worry about it unless you frequently photograph clear skies at F11 and smaller because such dust is usually not visible when photographing more complex scenes at F8 and larger.

    To filter the air, get a vacuum cleaner with a water-based filtration system. Let it process the air in your target work space for a while. Replace the water and repeat until there is no more dust in the air (the water will be clear).

    You can also use an ordinary HEPA air filtration system, but I find they don't pull dust out of the air as quickly or thoroughly as water-based vacuum cleaners.

    Leave your air filtration system of choice running while you work on your sensor. Point the air exhaust away from your work area.

  2. Use a blower to remove whatever dust you can from the camera and sensor. Blow toward the air filter so it can pull the dust away from your work area. Check whether the sensor is clean enough. If it is, leave it alone.

  3. If you feel the need to use a wet process, understand that you risk making it worse by getting fluids into the sensor stack, leaving residues behind, or cementing dust to the sensor so that it will be impossible to blow off in the future.

  4. Once your sensor is perfectly clean, attach your favorite lens to the camera and never take it off.

To demonstrate, here are images taken at F36 to demonstrate sensor dust before and after blowing out the dust and a single cleaning with a wet-process, as described above. I spot two specks in the after image. There may be more, but it's less than the before (more than ten). Rather than chase them down, I'm quitting while I'm ahead.

before after

First mistake: "So I do a bit of research online and land on the fact that I can do this myself."

Famous last words.

Second mistake: "What I do is close my aperture down to F22..."

Aside from when you are actively looking for dust or taking pictures of resolution charts, how often do you take pictures with apertures of F16 and smaller? If not often, what's the point of having a perfectly clean sensor?

Third mistake: "Okay maybe it just needs a good blow out."

You should have done that before the first cleaning, not after.

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Thought of possible oil drops? The d7000 or 7100 had this problem.

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