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Sensor Dust - A Screener Request  
User currently offlineGranite From UK - Scotland, joined May 1999, 5568 posts, RR: 64
Posted (10 years 1 month 3 weeks 6 days 1 hour ago) and read 7313 times:
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Hi all

With all the new crop of digitals going around more and more images are being uploaded with sensor dust/spots visible.

While this may have not been a major problem in the past, it is now and the BADDIRTY rejection reason will come into play more often.

If anyone get's this rejection reason, please don't rant and rave. It's a friendly warning from your screener to say your sensor needs cleaning.

There have already been discussions on this forum on how to detect the spots.

Being a screener for about 5 years now, I can spot them straight away so none will get past me  Wink/being sarcastic

So..........before you upload, check the image for spots in blue skies and even cloudy ones, depending on contrast.

Any questions, just ask.

Cheers

Gary


20 replies: All unread, jump to last
 
User currently offlineMirage From Portugal, joined May 1999, 3125 posts, RR: 14
Reply 1, posted (10 years 1 month 3 weeks 6 days 1 hour ago) and read 7260 times:

Can you make that text an email to be send to all photographers?

We know this forum is not visited by all...

Luis


User currently offlineGranite From UK - Scotland, joined May 1999, 5568 posts, RR: 64
Reply 2, posted (10 years 1 month 3 weeks 6 days 1 hour ago) and read 7241 times:
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Luis

A good idea and I will have to pass on to Johan to see if he can mail all.....thanks.

On a separate note, I supply aviation images to a professional agency and have been instructed by them to ensure that all sensor spots are erradicated before being passed on to the customer.

Cheers

Gary


User currently offlineSulman From United States of America, joined Mar 2004, 2035 posts, RR: 32
Reply 3, posted (10 years 1 month 3 weeks 6 days 1 hour ago) and read 7233 times:

Gary,

Quick question. Are dust spots always semi-transparent, with a 'circular' appearance?

Reason I ask is that I think I've been eradicating little birdies from my images..whereas I only have one speck of dust in the bottom left that I'm actually aware of...

Cheers

James



It takes a big man to admit they are wrong, and I am not a big man.
User currently offlineGranite From UK - Scotland, joined May 1999, 5568 posts, RR: 64
Reply 4, posted (10 years 1 month 3 weeks 6 days 1 hour ago) and read 7225 times:
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James

Yep, you are correct.

I've mentioned this a million times, invest in a Speckgrabber. One of the cheapest, most valuable items you can have in your camera bag.

Cheers

Gary



User currently offlineKaddyuk From Wallis and Futuna, joined Nov 2001, 4126 posts, RR: 26
Reply 5, posted (10 years 1 month 3 weeks 6 days ago) and read 7183 times:

I have had one or two of these and now am more aware of them in my pictures  Smile


Whoever said "laughter is the best medicine" never had Gonorrhea
User currently offlineJeffM From United States of America, joined May 2005, 3266 posts, RR: 51
Reply 6, posted (10 years 1 month 3 weeks 5 days 22 hours ago) and read 7140 times:

To find your dust, just open an image and click Image>Auto Levels. Most of the time doing that will show you some hidden dust you did not know was there. Inversing the image and then doing the Auto Levels will also show you some hard to find dust.

User currently offlineWoody001 From United Kingdom, joined Feb 2004, 529 posts, RR: 22
Reply 7, posted (10 years 1 month 3 weeks 5 days 22 hours ago) and read 7119 times:

Gary,
I cleaned my sensor last weekend before a visit to Old Warden, they're in the queue, makes processing images so much quicker. It's surprising just how quick dust builds up on the sensor and I'm a fussy bugg@r when it comes to changing lenses  Smile

I tend to let it build up to a certain level and then clean it.

I agree with the e-mail idea.

Ian.



If I could just get the afterburner working...
User currently offlineBeechcraft From Germany, joined Nov 2003, 828 posts, RR: 41
Reply 8, posted (10 years 1 month 3 weeks 5 days 19 hours ago) and read 7073 times:

Hey Gary,
i guess you did a lot of screening from my last upload.  Smile/happy/getting dizzy
My first with my D70, I´ll be more aware of those dust spots from now on....

best regards, Denis



That's it! You people have stood in my way long enough. I'm going to clown college!
User currently offline2912n From United States of America, joined Oct 2001, 2013 posts, RR: 8
Reply 9, posted (10 years 1 month 3 weeks 5 days 17 hours ago) and read 7032 times:

In response to a question above about how they appear...Yes, they usually appear as a spot, almost translucent. However you might get a fiber or hair in there that will look like a squigly line.

User currently offlineLennymuir From United Kingdom, joined Oct 2002, 434 posts, RR: 6
Reply 10, posted (10 years 1 month 3 weeks 5 days 13 hours ago) and read 6974 times:

Gary

I presume to you can differnetiate between sensor dust and the Scottish midgie!
Midgies tend to be darker and smaller on the photograph.
Unavoidable when shooting in over grass or within the vicinity of trees after rainfall.

Midgie = a very small fly, like a mosquito, but much more annoying!

Gerry


User currently offlineGranite From UK - Scotland, joined May 1999, 5568 posts, RR: 64
Reply 11, posted (10 years 1 month 3 weeks 5 days 3 hours ago) and read 6911 times:
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Hi all

A link to some more info on sensor cleaning:

http://www.luminous-landscape.com/essays/sensor-cleaning.shtml

Thanks to Yvan for his e-mail.

Cheers

Gary


User currently offlineGranite From UK - Scotland, joined May 1999, 5568 posts, RR: 64
Reply 12, posted (10 years 1 month 3 weeks 5 days 3 hours ago) and read 6907 times:
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Gerry

No real problem with Midgies at ABZ..........only sheep and wasps  Smile

Cheers

Gary


User currently offlineKarlok From Netherlands, joined Mar 2002, 839 posts, RR: 1
Reply 13, posted (10 years 1 month 3 weeks 4 days 19 hours ago) and read 6855 times:

Instead of email every photographer it is also possible to ammend the rejection text. or just add the text like

"If you use a digital SLR, you should check your sensor from any dust. But be aware with it, it's sensitive and expensive. Airliners.net is not responsible for any damage."

Just an ide.a.


User currently offlineDonder10 From Canada, joined Oct 2001, 6660 posts, RR: 21
Reply 14, posted (10 years 1 month 3 weeks 4 days 18 hours ago) and read 6841 times:

Gary,
do you have the URL for speckgrabber?


User currently offlineQantas744 From United Kingdom, joined May 2004, 246 posts, RR: 5
Reply 15, posted (10 years 1 month 3 weeks 4 days 17 hours ago) and read 6830 times:

This might help Alex:

http://www.airliners.net/discussions/aviation_photography/read.main/92746




Matt



you can't buy time but you can sell your soul and the closest thing to heaven is to rock'n'roll
User currently offlineConcord977 From United States of America, joined Jan 2004, 1261 posts, RR: 25
Reply 16, posted (10 years 1 month 3 weeks 4 days 16 hours ago) and read 6811 times:

I am sure I have a dusty CCD problem with my D100. I found a source for speckgrabber locally. But is this something I can do myself?


No info
User currently offlineLorm From United States of America, joined Jun 2004, 409 posts, RR: 1
Reply 17, posted (10 years 1 month 3 weeks 3 days ago) and read 6690 times:

Kinda new here myself with higher end digital cams, and I'm not sure it's sensor dust but in some photos on A.net there are small circles that are bluish or sometimes violet specs. Is this CCD dust or a problem with the sensor itself?


Brick Windows
User currently offlineGranite From UK - Scotland, joined May 1999, 5568 posts, RR: 64
Reply 18, posted (10 years 1 month 3 weeks 3 days ago) and read 6686 times:
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Lorm

That may be lens flare.

Would need to see some samples.

Cheers

Gary


User currently offlineLorm From United States of America, joined Jun 2004, 409 posts, RR: 1
Reply 19, posted (10 years 1 month 3 weeks 2 days 10 hours ago) and read 6608 times:

Granite/Gary,

Okay this is a tough one because its one
of my favorite images from my home
airport. It's actually a green spec this
time. But in images I less remember they
appear blue or violet.

Center frame lower half of the image is
a green spec. It looks digital and not
part of environmental conditions.


View Large View Medium

Photo © Ray Harvey



Edit: Actually if you go Normal View Large Size mode when looking at the image it lines up vertically with the "F" in Fit Screen from "[Medium Large Fit Screen]"

[Edited 2004-07-13 05:19:07]


Brick Windows
User currently offlineGranite From UK - Scotland, joined May 1999, 5568 posts, RR: 64
Reply 20, posted (10 years 1 month 3 weeks 2 days 7 hours ago) and read 6599 times:
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Lorm

Possibly a 'hotspot'

This can easily be cloned out with Photoshop but I cannot see it as being a problem.

Regards

Gary


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