I noticed bunch of dots at 85mm/f22 images.
But automatic sensor cleaning is ON, but actually doesn't really work OR it completely NOT effective.
I run Clean Now 10 times, took picture again... and you know what - I got almost the same picture like first time almost no changes!
Look like sensor shake doesn't work....
Is it possible to hear how shaking works?
BTW I've cleaned sensor by canned air pretty effectively...
The automatic cleaning will not replace proper manual cleaning, at least not today's variety. But it arguably helps. At f22, you'll pretty much always see dirt.
Repeat after me: "The dust 'cleaning' system is actually a dust reduction system. The dust 'cleaning' system is actually a dust reduction system." Bit of dust are going to adhere to the sensor and there are going to be some that can't be shaken loose. It is a fact. Some bits are too small to be effected, but become visible stopped down. Others are too electrically charged to be dislodged. Think of it like a rug. You can take it outside and shake out dust and dirt, but you didn't "clean" the carpet. Cleaning it would still require shampooing and and vacuuming.
P.S. Can somebody confirm this: I remember hearing or reading a while back that some camera manufacturer did an analysis of the "dust" collected on its sensors and that the tests revealed that most of the dust was plastic material...i.e. most sensor dust isn't pollen, sand, dirt, etc, but rather bits rubbing off from the the camera's body cap and lens caps.
Edited by Craig Gowens on Aug 31, 2008 at 12:15 AM GMT
Eeek, I read right past that last statement by the OP. Jon is right, DON'T USE CANNED AIR!!! Compressed air is fine, but the "dust cleaner" cans you get to clean computers has other chemicals it in that are not good for the sensor.
JonStafford wrote:
I've always heard canned air's the worst thing for the sensor....maybe it's leaving a residue that the dust particles are sticking to.
Well, this is just liquid hydroflurocarbon which evaporates and blows away all garbage
It can spit drops of liquid only if use it not careful enough...
If people know any other dangers of using canned "air" please tell me
General statement - I understand it is just REDUCTION system... BUT I repeated it 10 times and noticed no changes.... what I suppose to think in that case?!
Mihail wrote:
General statement - I understand it is just REDUCTION system... BUT I repeated it 10 times and noticed no changes.... what I suppose to think in that case?!
If it was me, I would think the dust was stuck on and that I needed to clean the sensor with a "wet" method. What else am I supposed to think in that case?
l.g.c. wrote:
If it was me, I would think the dust was stuck on and that I needed to clean the sensor with a "wet" method. What else am I supposed to think in that case?
I start to think "it just doesn't work". I found an article which claims dust reduction system in 40D is great.... I personally don't see any effect at all!
Depends on the type of dust. Loose non-adhesive dust falls right off. Sticky dust tends to stick and needs contact and or wet methods to remove. Whatever my 1-year old 40D hasn't needed any CMOS cleaning other than the default auto shake.
The 40D's dust reduction system isn't perfect by any means, but it definitely helps. It couldn't remove most of the gunk that was on my 40D when I got it, but a few brush and blower cleanings later, the sensor was spotless. I've had a couple pieces of dust show up since that needed a blower, but it's cleaner than my old 350D, and MUCH cleaner than my 5D.
Olympus' system is better than Canon's in my experience. I had junk on my E-410 when I bought it. After brushing the sensor has remained spotless ever since. I've actually dispensed with what most consider DSLR best practices to avoid dust (hide the mirror box when switching lenses, don't leave lenses off for long periods of time, etc), and even still haven't had a single piece of dust stick.
I suspect in a few more iterations Canon will catch up to Olympus, and the only kind of dust we'll have to worry about will be adhered gunk.
Mihail wrote:
I start to think "it just doesn't work". I found an article which claims dust reduction system in 40D is great.... I personally don't see any effect at all!
Mihail,
Generally speaking, yes, wet cleaning your sensor will help dust specks from sticking to the surface. But even after doing that, dust will adhere to the surface regardless. Don't know if this will make you feel better, but I allowed my sensor to accumulate 15 dust particles (this was after about 5 wet cleanings). I then did the exact same test as you did - 12 consecutive shakes. And my results were just like yours, one of the specks moved about 2 mm., the others stayed right where they started.
My experience so far with the dust-shaker is that the more often you swab the sensor, the more effective the shaker becomes. Kind of defeats the purpose, no?
Mihail wrote:
Don't press hard on button, keep nozzle always up right, never do heavy bursts, secure nozzle firmly to prevent it from flying into sensor
Well that's your problem right here. Nozzle not upright but rather horizontal (bottle upright). Nozzle upright means that liquid can get into the system. If you hold the bottle upright, nozzle horizontally, and do a few blows to the side to clear any liquid, you'll be safe(r).
If you're shooting at f/22 you're going to have other issues besides seeing the dust. Diffraction . . .
Also, for those considering the use of canned air to clean your sensor, how durable do you think shutter blades might be to the force of the air bowing off the edges of the sensor? Or, what about blasting dust past the edges of the focus screen and into the prism chamber? But, my favorite all time stupid way to clean the sensor is the product offered by a German company whose name escapes me right now. It's a liquid glue-like substance you spread on the sensor, wait ~6 hours for it to dry (the whole time with the camera in sensor clean mode), and then peel off by catching the edge of the dried glue with a sharp blade.
try another lens and shoot at f/22+. if the dust falls at the same place everythime with any lens, then the dust must be at the sensor or somewhere elese other than the lens.
i had that problem before and discovered that the dust in the lens is the culprit.
