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#11
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Ping PeterN: Sensor dust
"PeterN" wrote in message
... On 9/11/2014 6:19 PM, Savageduck wrote: I know you take your competition entries seriously, but you just seem to ignore basic maintenance such as cleaning sensor dust. That is something you really need to take care of as there is only so much you can fix in post. If you don't see the dust spots, particularly in color fields such as sky, that doesn't mean that other folks can't see them. Since you are happy using ACR, select the *Spot Removal* tool and check the *Visualize Spots* check box, and bump the zoom up to 100%. https://dl.dropbox.com/u/1295663/FileChute/screenshot_897.jpg If you inspect the sensor, those dust spots should be in the bottom right corner, but I suspect your contamination is spread further than that. I have to ask, after all this time and experience you have with DSLRs, do you ever clean your camera's sensor? ...or should I say, have you ever cleaned any DSLR sensor? If not you really need to learn how to do it. Either that or pay for regular cleaning by whoever works on your cameras. If they charge you for sensor cleaning, trust, but verify. Shoot wide open at a good monochrome color field target and check that the spots are gone. If you want information on cleaning tools just ask. \ Thanks. You are not wrong. I have a bad habit of not cleaning my sensor. In fact the last time my sensor was cleaned was a few years ago, on my D300, and PAS did it for me. I remember that day well. One fellow brought me his full-frame camera to clean and I was horrified when I put my sensor scope on it and looked at the sensor. I have never seen such a filthy sensor and doubt anyone reading this would ever see one filthier. I took the scope off and could see a lot of dust. The in-camera dust shakers can be effective but are not a guarantee. My 7D gets dust on it occasionally that I have to clean off. My Sigma DSLRs have a dust protector on them but it doesn't keep internal dust from getting on the sensor and they require a cleaning once-in-a-while. |
#12
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Ping PeterN: Sensor dust
"Giff" wrote in message
... On 12/09/2014 14:55, PAS wrote: When I clean a sensor, it's usually a three-step cleaining process: 1. Rocket blower. If that doesn't get it clean, go to #2 So far blowing has been enough for me. Not this time though. 2. Nylon brush. A blast of compressed air on the brush gives it a static charge and it will lift most dust off of the sensor, If that doesn't work, go to #3 What kind of brush to use? I guess I should not just pick a random one A 100% nylon brush is what you want. You can buy one "made" especially for sensor cleaining such as a VisibleDust brush but I found them to be nothing more than high-quality brushes at a very high price. I bought a nylon artist's brush at a craft store and use that, it cost me less than $8.00 and it is high-quality. If you go that route, you just have to be certain that there is no residue on the brush from the factory such as sizing material. To verify that it's clean, take a clean lens filter and go back-and-forth with the brush a hundred times (it really only take seconds to do that). If you see a film on the filter, it needs to be cleaned. Dissolve some mild detergent in water and let the brush soak overnight. Take it out and rinse it off and then soak it overnight in clean water. After removing it from the water, let it dry and then do the filter test again. Repeat if necessary. The brush I bought has an acrylic handle, not wood and was nice and clean when I got it. I've used it on a over a hundred different sensors. 3. Wet cleaning. I see that there are different products available, any recommendation? (I have a cropped, nikon D7100, if that matters) Size does matter as some materials such as brushes and wet-cleaning swabs are made for different size sensors. You don't want to use something that's bigger than your sensor as you might brush or swab the area around the sensor and it may have oil or other residue on it. Eclipse fluid is very good, it evaporates almost immediately. You can get a really good cleaning kit from Copperhill http://www.copperhillimages.com/ I use a sensor scope so that I can see dust on the sensor without having to take test shots of light-colored walls at f16 or higher in order to see if there is dust on the sensor. You may not get all the dust off on the first try so it's easier to just use a scope to check the sensor rather than have to put a lens back on your camera and then take a test shot and view it on your computer. Cleaning a sensor is not as difficult as some think, it's not dangerous at all as long as you do it properly. The most important thing you have to do is use a fully-charged or an AC adapter. You don't want to have a battery failure in the middle of your cleaning process where your shutter closes as you have a brush or swab in the body, that's not good. |
#13
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Ping PeterN: Sensor dust
On 9/13/2014 6:30 PM, PeterN wrote:
On 9/11/2014 6:19 PM, Savageduck wrote: I know you take your competition entries seriously, but you just seem to ignore basic maintenance such as cleaning sensor dust. That is something you really need to take care of as there is only so much you can fix in post. If you don't see the dust spots, particularly in color fields such as sky, that doesn't mean that other folks can't see them. Since you are happy using ACR, select the *Spot Removal* tool and check the *Visualize Spots* check box, and bump the zoom up to 100%. https://dl.dropbox.com/u/1295663/FileChute/screenshot_897.jpg If you inspect the sensor, those dust spots should be in the bottom right corner, but I suspect your contamination is spread further than that. I have to ask, after all this time and experience you have with DSLRs, do you ever clean your camera's sensor? ...or should I say, have you ever cleaned any DSLR sensor? If not you really need to learn how to do it. Either that or pay for regular cleaning by whoever works on your cameras. If they charge you for sensor cleaning, trust, but verify. Shoot wide open at a good monochrome color field target and check that the spots are gone. If you want information on cleaning tools just ask. \ Thanks. You are not wrong. I have a bad habit of not cleaning my sensor. In fact the last time my sensor was cleaned was a few years ago, on my D300, and PAS did it for me. I'm surprised the D800 doesn't self-clean better. I've never had to clean my 5D2 or 5D3 sensor. I see the occasional dust spot. but it invariably disappears the next shooting session, after the auto-clean occurs. You don't have that feature turned off, do you? Well, maybe it is just the NYC smog. But it gets very dusty here in Texas, especially in the drought. Thankfully, there was some rain recently. |
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