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Photo Forum / Digital Photography / DSLR Cameras / January 2005Dust visible at f/36
I just tried a shot at f/36 with the D70 & it looks like someone splattered mud on my lens. Is that sensor dust? It is invisible at reasonable f-stops. Here is a 100% crop: <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/2005- 01-19-view/f-stop-test&PG=1&PIC=2> That's bad! This is just a tiny bit of the image & they are solid black. Or is that gunk on the end of the lens in focus due to the greater depth of field? I can see a big fleck of shiny something about 1/2-inch inside the front, I tried dusting off the sensor gently & removing the filter from the front & dusting that with canned air. The blobs remained in position. I know my house is very dusty & I also shoot out in the woods, etc. >I just tried a shot at f/36 with the D70 & it looks like someone splattered >mud on my lens. Is that sensor dust? It is invisible at reasonable f-stops. [quoted text clipped - 8 lines] > position. I know my house is very dusty & I also shoot out in the woods, > etc. Those are UFOs. >I just tried a shot at f/36 with the D70 & it looks like someone splattered >mud on my lens. Is that sensor dust? It is invisible at reasonable f-stops. [quoted text clipped - 8 lines] > position. I know my house is very dusty & I also shoot out in the woods, > etc. f.ck man the quality sucks!!!! Rather horrible, isn't it? > f.ck man the quality sucks!!!! Long distances combined with haze and smog will tend to do that. steve >>f.ck man the quality sucks!!!! > > Long distances combined with haze and smog will tend to do that. 200mm zoom from 28mm plus hazy winter valley fog plus a curve to emphasize. >I just tried a shot at f/36 with the D70 & it looks like someone >splattered mud on my lens. Is that sensor dust? >It is invisible at reasonable f-stops. Here is a 100% crop: > <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/2005- 01-19-view/f-stop-test&PG=1&PIC=2> It's sensor dust. Bart >> I just tried a shot at f/36 with the D70 & it looks like someone >> splattered mud on my lens. Is that sensor dust? >> It is invisible at reasonable f-stops. Here is a 100% crop: >> <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/2005- 01-19-view/f-stop-test&PG=1&PIC=2> > > It's sensor dust. Yeah I guess so. I just tried a little shot of air with the mirror lock-up this time (doh) & lost some of them but will have to get a proper cleaning kit or technique. Strange the way they are only visible at such a crazy f-stop. Just hideous though! >>> I just tried a shot at f/36 with the D70 & it looks like someone >>> splattered mud on my lens. Is that sensor dust? [quoted text clipped - 6 lines] > lock-up this time (doh) & lost some of them but will have to get a > proper cleaning kit or technique. Yes, the better ones are: http://www.visibledust.com/sensorbrush.htm (it really works, I can say from experience), and http://www.pbase.com/copperhill/ccd_cleaning for the really stubborn stuff. > Strange the way they are only visible at such a crazy f-stop. Just > hideous though! At those narrow apertures, the cone of light that's focused on the sensor's pixels is very narrow, which tends to produce sharp/harsh shadows. Bart > Yes, the better ones are: > http://www.visibledust.com/sensorbrush.htm (it really works, I can say > from experience), and Seconded, works as advertised. Expensive, but I don't have to go to a service center and I don't feel right about putting liquids inside my camera. Jean > >>> I just tried a shot at f/36 with the D70 & it looks like someone > >>> splattered mud on my lens. Is that sensor dust? > >>> It is invisible at reasonable f-stops. Here is a 100% crop: <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/ 2005-01-19-view/f-stop-test&PG=1&PIC=2> > >> It's sensor dust. > > [quoted text clipped - 5 lines] > http://www.pbase.com/copperhill/ccd_cleaning for the really stubborn > stuff. used it on my d70 - very happy with the results... sid How did you lock the mirror up? I thought the D70 didn't have mirror lockup? > How did you lock the mirror up? I thought the D70 didn't have mirror > lockup? He's talking about cleaning, with mirror up, not during photoshooting. It's in the Custom Functions... >How did you lock the mirror up? I thought the D70 didn't have mirror >lockup? -------------------------------- Locking up the mirror on a D70 is only for cleaning, not for shooting. > It's in the Custom Functions... > >>How did you lock the mirror up? I thought the D70 didn't have mirror >>lockup? > > -------------------------------- > I just tried a shot at f/36 with the D70 & it looks like someone > splattered mud on my lens. Is that sensor dust? It is invisible at > reasonable f-stops. Here is a 100% crop: <http://www.edgehill.net/1/?SC=go.php&DIR=California/Bay-Area/San-Francisco/ 2005-01-19-view/f-stop-test&PG=1&PIC=2> > That's bad! This is just a tiny bit of the image & they are solid black. > [quoted text clipped - 4 lines] > position. I know my house is very dusty & I also shoot out in the woods, > etc. Use the rocket bulb blower. It worked for me on the 20D. >> I just tried a shot at f/36 with the D70 & it looks like someone >> splattered mud on my lens. Is that sensor dust? It is invisible at [quoted text clipped - 12 lines] > > Use the rocket bulb blower. It worked for me on the 20D. Me too. However when I first bought it I was mad because it didn't work well enough. So I got the Sensorswab and the Eclipse and this got the sensors clean on my 1D and 300D. But nowadays I'm just a lot more careful and blow out regularly - before and after lifting the mirror - that I haven't had to swab the sensor for months. ----------cut > I just tried a shot at f/36 with the D70 & it looks like someone > splattered mud on my lens. Is that sensor dust? It is invisible at > reasonable f-stops. -----------cut Doctors know this phenomenon as "mouches voulantes" in the human eye. When the pupil (aperture) is narrow because of bright light one can see the anomalies in the media of the eye more clearly. I expect the same to happen in camera's.  SignatureRegards, Hyperion > ----------cut > [quoted text clipped - 8 lines] > anomalies in the media of the eye more clearly. > I expect the same to happen in camera's. You mean when we see 'floaters' in our sight? (I believe you mean 'mouches volantes') == Cheers, Alan Signature-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. >> ----------cut >> [quoted text clipped - 12 lines] > > (I believe you mean 'mouches volantes') Yes, indeed! (Both questions ;-) ) SignatureRegards, Hyperion |
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