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11/12/2005 07:49:16 AM · #26 |
Just for comparison:
//cpix.co.nz/sensor.jpg
20D F/32 autolevels Cleaned it about a week ago...
//cpix.co.nz/1dsensor.jpg
1DMk1 F/32 autolevels It needs cleaning. :-).
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11/12/2005 07:58:18 AM · #27 |
Before (you can click on the images for an 800px wide version)
Nikkor 70-200 VR at 70mm f/22, Undexposed sky shot with autolevels.
After
Nikkor 18-70 DX at 70mm f/29, Underexposed piece of paper with vignetting because of the lighting and autolevels.
I wanted to get rid of the big spot in the before one. Used a 16mm sensor brush to do this. Took about 3 cleanings (first time, still a lot of muck in the chamber as well. You can see that I still left some dust near the edges. I haven't got a good blower to charge my small 8mm brush, so it doesn't pick up the dirt too well.
Happy with this result, the resulting dust is in a position where you don't see it too much and the specs are so small that I can happily shoot to f/10 or so without them turning up. That's good because I rarely get above f/8
Message edited by author 2005-11-12 08:01:09.
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11/12/2005 08:15:45 AM · #28 |
Originally posted by bear_music:
Originally posted by bear_music:
Doesn't look like sensor dust to me. Lens aperture should have no effect on the sharpness of sensor dust spots, which are integrated into the image AFTER light passes through the lens. More likely this is dust ON the lens, and the more you stop it down the more it shows up.
To detect sensor dust, photograph your white wall completely OOF; focus on infinity and shoot away wide open. Nothing in the lens will show this way, and you'll see what's actually sensor dust.
R.
Edit to add; it could be paint flecks INSIDE the lens, on one of the inner elements, and that's bad... How old is the lens? |
EDIT to add: apparently the above is totally wrong. I'm waiting for some techie to explain how dust ON the sensor can be affected by aperture... |
All a question of DOF, the dust is not actually on the sensor but on a protective glass plate called the low pass filter, at large apertures the DOF is too small to allow the shadows cast by the tiny dust particles to be in focus, at smaller apertures they become in focus. Dust on your lens will never show up as tiny specks because light comes from all directions not just perpendicular to the lens and dust spot.
Everyone knows by now that I use the Sensor brush and haven't had ANY problems in a year, it's a 5 minute job cleaning the sensor with it, 2 to 3 passes and that's it, clean sensor.
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11/12/2005 08:19:24 AM · #29 |
Originally posted by fotomann_forever:
Perhaps use some canned air? Anyone back this? |
NO!!! NEVER do that! |
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11/12/2005 08:58:14 AM · #30 |
OK, I acquired a small swab, attached a pec pad to it and wiped just the edges of the sensor and here are the results. Pictre at f/51 with levels done and same pic with no levels. I think that's as good as it will get but it did improve significanly. I can go back to my reguarly schedules life now :P
June
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11/12/2005 09:02:24 AM · #31 |
Originally posted by chiqui74:
OK, I acquired a small swab, attached a pec pad to it and wiped just the edges of the sensor and here are the results. Pictre at f/51 with levels done and same pic with no levels. I think that's as good as it will get but it did improve significanly. I can go back to my reguarly schedules life now :P
June |
Noo, you can do a LOT better!
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11/12/2005 09:11:19 AM · #32 |
are we comparing durty sensors?
although mine isn't bad comapred to kiwi chris.
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11/12/2005 09:55:55 AM · #33 |
Much better....I used the eclipse and swabs also. It seems like you had some "dirty" swabs at the first cleaning. However, it didn't look like dust to me. All the spots were very similar, almost identical. Seems to me that you deposited something on the sensor from the pad.
KenSkid
Originally posted by doctornick:
Originally posted by chiqui74:
OK, I acquired a small swab, attached a pec pad to it and wiped just the edges of the sensor and here are the results. Pictre at f/51 with levels done and same pic with no levels. I think that's as good as it will get but it did improve significanly. I can go back to my reguarly schedules life now :P
June |
Noo, you can do a LOT better! |
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