Help What is This

[Icebreaker]

c:/Resize of 100_0020.jpg

Can anyone tell me what his is. I've cleaned the sensor as per the manual. I tried a different lens, come up in the same place. Is it a scratch?:~( Please say it ain't so!!! I seem to apear only when tis portion is on the sky, or maybe it's just because it uniformly bright. Any sugestions greatly appreciated

LDW

[dtrayers]

Can't see the picture. The link is to your C:/ drive. You need to post the picture on the internet and then link to the url of the picture.

[EXA1a]

There's no picture, maybe you forgot to push the trigger of your camera?

Jens :-))

[robertwgross]

I agree with Dave, the link points to the local file on your C: drive, not the URL out on the web someplace.

---Bob Gross---

[Icebreaker]

Sorry Thought it would embed the picture will try to post it somewheres tonight.

ok Here it is
http://www.pbase.com/image/23221346

hope this works I real interested in what you think. sorry about the newbie slip up The center cirle is not very visable, but in the big picture it appears as a small shadow.

I blew some dust off tthe mirror, in the down (not Triggered) position, with a small squirt of compressed air. Is there any way that it could have got past the mirror and damaged the sensor???

LDW

[hmhm]

Just looks like run-of-the-mill sensor dust, which is a common problem, though no worse than a minor nuisance, in my experience. You'll see it when using small apertures (e.g f/16, f/22) on areas of an image with no detail, like the sky. If you haven't already, learn how to use the clone tool in Photoshop to quickly squish these specks in post-processing.

If your sensor has so many specks like this that you don't want to clean them up in post-processing, then you need to clean up your sensor.

First try a bulb blower. Do _not_ use the brush. Alternately, try clean compressed air (e.g. americanrecorder.com), do _not_ use compressed air with liquid propellants, ala computer dust-off products.

The last resort is to swab the sensor clean, look on www.photo.net for a recent article on doing this.
-harry

[dtrayers]

It's been my experience that dust only is really visible in the image at f/16 or smaller, so if it is dust, I think you should be able to see it on the sensor. To me, it looks pretty big. Do you see it in all pictures in the same place?

Put the camera in cleaning mode and hold it at chest level under a bright diffuse light. As the light reflects off the sensor and AA filter, you should be able to see any dust. Try a bulb blower to remove it, or if your more adventurous, try this method:

http://www.pbase.com/copperhill/ccd_cleaning

[Icebreaker]

OK I paniced:eyes

I had tried a bulb blower but it didn't work. So I got closer to the sensor and tried harder.

It worked:D

I'll have to try it on a bright sky in the morning but a picture of my wall under a halogen light apears normal.

Thanks, and sorry for jumping the gun.

LDW

[Belmondo]

I've made it a habit to do a little preventitive 'sensor blowing' every day before I start shooting, and again at the end of the day before I stow my gear. Some will argue 'overkill,' but I've really not had any trouble for some time now, and I live in the desert where there's lots of sand, dust, and wind. Also, I frequently change lenses in the field, so I have plenty of opportunity to collect dust.

On your picture, the blob you circled on the left is pretty typical of the dust I've seen. The one on the right is much more interesting, and actually has far more of a three-dimensional appearance to it. I'm sure you could convice somebody that's a UFO.

Glad you fixed your problem.

Tom

[agit-prop]

dtrayers wrote: if your more adventurous, try this method:

http://www.pbase.com/copperhill/ccd_cleaning




I have visions of dragging dust particles of indeterminate origin over the hot mirror of my D30 and it makes me nauseous.

I'll stick to a blower bulb, thanks.

[Derek Smith]

The sensor surface is stated to be as hard as normal glass, so unless you have silicon carbide dust on the surface it is unlikely to be hard enough to damage the sensor surface.

The method defined by Nicholas R (Copperhill) does NOT advocate dragging or scratching dust particles over the sensor surface. His method lifts the dust into a PecPad away from the sensor and the PecPad surface is used for one wipe ONLY, thereby making sure that dust is not scrubbed back onto the sensor surface.

Apart from the fact that this method is simple and VERY effective, it has the major advantage of removing the dust from the body enclosure. Blowing simply redistributes the dust into the body enclosure so that when you start to use the camera again dust inside the enclosure just gets dragged straight back onto the sensor.

Finally, dust comes in all sizes and the smaller the particle the harder they are stuck. Really small particles will not be removed by blowing and over time your sensor will progressively 'fog over' with really fine dust. None of these tiny dust particles will be visible as discrete 'dust bunnies' but they will degrade your image. Remember also that in cities, dust particles include tiny droplets of oil. No amount of blowing will remove them and again the effect is one of gradual loss of image clarity.

Nick's great method solves all these problems and is really easy to do. However, if you are one of those people who cannot read and follow clear detailed instructions then you should stick with your puffers and put up with slowly degrading images.

Personally, I think that Nick's method is one of the best 10D user tips I have acquired through this forum

Derek