Not a dirty sensor


Galoot

Link Posted 26/07/2008 - 15:03
Well, at least I don't have to clean the sensor, just wipe the foot-prints off the lens




link

Keith Grant

Link Posted 26/07/2008 - 15:59
UFO sighting?
Keith

K100D Super, DA 18-55, M 50 1.4, M 100 4 Macro

"The present is the object of vision, and what I see before me at any given second is a full field of color-patches scattered just so. The configuration will never be repeated." ~ Annie Dillard

Mike-P

Link Posted 26/07/2008 - 16:28
Ha, I wondered where my avatar had gone, that's why I changed it to something else.
Glad to see hes back now though.
. My Flickr

johnriley

Link Posted 26/07/2008 - 16:47
I keep trying to stamp on your Avatar sockpuppet, but it keeps getting away.
Best regards, John

Tyr

Link Posted 26/07/2008 - 16:49
Aaaah! Run! Meteor!!!
Regards,
Dan

https://www.flickr.com/photos/honourabletyr/

ChrisA

Link Posted 26/07/2008 - 19:44
You laugh, but I kid you not, I had something nearly that big on the sensor.

There was this heowwwwwwwge thing on a few of the photos, and I gave the innards a blast with the rocket.

And a great lump of something, easily big enough to see, fell out. Not floated out, fell out.

How it got in, heaven knows.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Galoot

Link Posted 26/07/2008 - 21:00
I'm not laughing, I have a bit of a strange problem, where I get, what I assume is dirt on the sensor, but it only appears intermittently, maybe on 10% of shots, and not even on consecutive shots, note the top R/H corner,




a close up here,




I assume it's a virus I caught from 'Clarky', where one of his spiders just drops it in, to spoil my shots

I've tried blowing it out, ( rocket, not gob ), but to no avail.

It's easy to clone out, but it really bugs me.


Next attempt at getting rid of it will include, "Rocket Blower', Dyson vacuum cleaner, and a bottle of Jack Daniels, ( just to calm my nerves, you understand !!! ).
link

ChrisA

Link Posted 27/07/2008 - 08:23
Galoot wrote:
I'm not laughing, I have a bit of a strange problem, where I get, what I assume is dirt on the sensor, but it only appears intermittently, maybe on 10% of shots, and not even on consecutive shots, note the top R/H corner,

Is it always in the same place? If so, then I think it has to be something on the sensor.

I've also found that muck on the sensor doesn't appear in all the shots, even when the background is neutral enough to think that it should be obvious. It shows, then not, and then it appears again.

I don't really understand this either.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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johnriley

Link Posted 27/07/2008 - 09:03
Maybe the muck gets Shifted about by the action of the mirror and the movement of the shutter curtains?
Best regards, John

Clarky

Link Posted 27/07/2008 - 11:39
Galoot wrote:
I'm not laughing, I have a bit of a strange problem, where I get, what I assume is dirt on the sensor, but it only appears intermittently, maybe on 10% of shots, and not even on consecutive shots, note the top R/H corner,


I assume it's a virus I caught from 'Clarky', where one of his spiders just drops it in, to spoil my shots

I've tried blowing it out, ( rocket, not gob ), but to no avail.

It's easy to clone out, but it really bugs me.


Next attempt at getting rid of it will include, "Rocket Blower', Dyson vacuum cleaner, and a bottle of Jack Daniels, ( just to calm my nerves, you understand !!! ).

I assure you all my spiders have been put through a thorough medical before they are posted
Camera:|K-7|
Pentax Lenses:|DA12-24/f4 ED AL|DA35Ltd Macro|FA31Ltd|FA77Ltd|FA50/1.4|F70-210|FA20-35 f4/AL|A*200/f4 Macro ED|A50/1.7|A50 Macro f2.8|1.7xAF adapter|
Voigtlander|125/f2.5SL Macro APO Lanthar|
Sigma Lenses:|EX DG 100-300 f4|2X & 1.4X TC|
Flashes:|AF540FGZx2|RingFlash AF160FC|

golfdiesel

Link Posted 27/07/2008 - 12:18
ChrisA wrote:
Galoot wrote:
I'm not laughing, I have a bit of a strange problem, where I get, what I assume is dirt on the sensor, but it only appears intermittently, maybe on 10% of shots, and not even on consecutive shots, note the top R/H corner,

Is it always in the same place? If so, then I think it has to be something on the sensor.

I've also found that muck on the sensor doesn't appear in all the shots, even when the background is neutral enough to think that it should be obvious. It shows, then not, and then it appears again.

I don't really understand this either.

Usually dust only becomes visibly when using small aperture openings together with the neutral background you mentioned. With my DS I had dust on the sensor which was only visible at f11 or smaller.
Camera:K20D|Ist*DS|Spotmatic II|MZ-10
Pentax Lenses: DA16-45|DA50-200|50A 1.7
Tamron Lenses: 28-200
Takumar Lenses: SMC 55 1.8
Sigma Lenses: EX DG 50-500 'Bigma'|EX 50mm Macro
Flashes: Metz 58 AF-1|Samsung SEF-36PZF|Pentax AF-220T

Don

Link Posted 27/07/2008 - 14:53
living creature?
Fired many shots. Didn't kill anything.

ChrisA

Link Posted 27/07/2008 - 15:21
golfdiesel wrote:
Usually dust only becomes visibly when using small aperture openings together with the neutral background you mentioned. With my DS I had dust on the sensor which was only visible at f11 or smaller.

If the thing is sitting right on the sensor, and presumably simply casting a shadow on to it, from zero distance or thereabouts, why does the aperture affect it?
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Prieni

Link Posted 27/07/2008 - 15:36
ChrisA wrote:

If the thing is sitting right on the sensor, and presumably simply casting a shadow on to it, from zero distance or thereabouts, why does the aperture affect it?

Well, it is not sitting right on the sensor. It is sitting on top of the filter (i.e. the surface of the sensor assembly) and therefore a little bit off the sensor. At wide apertures more light can go "around" the sensor, therefore softening the shadow.
So when you take a test shot of a bright area out of focus at aperture 22 or similar you will be surprised what dust specs show up (not that they would pose too much of a problem for real world shots mostly).
How inappropriate to call this planet earth when it is quite clearly Ocean. - Arthur C. Clarke
Prieni's PPG page

ChrisA

Link Posted 27/07/2008 - 15:39
Prieni wrote:
Well, it is not sitting right on the sensor. It is sitting on top of the filter (i.e. the surface of the sensor assembly) and therefore a little bit off the sensor. At wide apertures more light can go "around" the sensor, therefore softening the shadow.

Yes of course. I'd forgotten about the filter. Thanks.
.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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