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04-13-2012, 08:03 AM   #1
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Sensor Stain Question

What does this look like? I have been noticing some stains on my pictures themselves and there are a few "blueish" dots on the sensor. When I take my pocket blower to the camera, the blue dots do not move. I thought I had a clean copy for the last year but now I'm second guessing this. Any thoughts?

04-13-2012, 08:29 AM   #2
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K-5 Sensor Stains | Pentax Support
04-13-2012, 08:31 AM   #3
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Please post an example. Odds are pretty good it's not a stain issue. AFAIK that was resolved well more than a year back. more like late January 2011 AFAIK

Without seeing it (with Exif attached) there is no way to tell. If you really want to diagnose it shoot a clear blue sky @ f22 or smaller. that will show all crud the sensor has on it
04-19-2012, 06:24 AM   #4
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Here are a few examples of what I'm seeing, 2 different lenses. The first is the fa43 and the landscapes are from the Sigma 10-20. Same identical smudge. My rocket blower can't remove whatever is on it. By "it", I'm referring to the piece of glass that I see immediately in front on me when I remove the lens. I'm assuming that is the sensor? Also, there is no obvious "stain" on it, but rather a few blue-ish freckles that can only be seen when I turn the camera a certain way into the light.

FA 43
Stain in question to the right


Sig 10-20
Stain on top since the orientation of the camera is for landscape


FA43 again...but here I CAN'T see it and it wasn't cloned out


Cloned out, confused and frustrated



04-19-2012, 06:28 AM   #5
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That is dust - dust moves and randomly disappears, as you've noted in the one shot it wasn't there. Also, the stains looked literally like a bunch of tiny little drops of gunk in random patterns, and became more visible specifically by using a smaller F stop.
04-19-2012, 06:31 AM   #6
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QuoteOriginally posted by pxpaulx Quote
That is dust - dust moves and randomly disappears, as you've noted in the one shot it wasn't there. Also, the stains looked literally like a bunch of tiny little drops of gunk in random patterns, and became more visible specifically by using a smaller F stop.
exactly

also some dust is very persistent, the longer it is there the more likely you will need a wet clean because it will weld itself to the sensor
04-19-2012, 06:46 AM   #7
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what should i use to wipe it off?
04-19-2012, 07:03 AM   #8
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there are a few levels
Personally i'm not a big fan of blowers (they just blow dust around)

Pentax makes a kit for cleaning that is good

Amazon.com: Pentax Image Sensor Cleaning Kit, O-ICK1: Camera & Photo


If you really need a wet cleaning then VisibleDust has an excellent kit

Sensor Cleaning

04-19-2012, 06:19 PM   #9
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QuoteOriginally posted by Deiberson Quote
By "it", I'm referring to the piece of glass that I see immediately in front on me when I remove the lens.
Umm, just checking, but you aren't referring to the mirror are you?

I assume you know how the mirror lock up function for cleaning the sensor works. (its in the manual)
04-19-2012, 06:27 PM   #10
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@Deiberson - not sure about the stain but I like the artwork #2 and #4, very nice!
04-20-2012, 04:03 AM   #11
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QuoteOriginally posted by PPPPPP42 Quote
Umm, just checking, but you aren't referring to the mirror are you?
glad i asked. i'll pull the manual out today. i had a feeling ever since i got into this hobby that the sensor couldn't be located behind the glass.
04-20-2012, 06:00 AM   #12
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I lifted the mirror up and took the blower to it.....no avail. I guess I'm going to have to get a kit.
05-05-2012, 05:58 AM   #13
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another question....
cleaning the sensor.....how hard is this to do? i placed an order from adorama for some flash equipment and was talking to a seemingly knowledgeable individual and he made it sound like i should just have someone do it for me. furthermore, he insinuated that i needed 200 bucks of equipment to do it correctly. he mentioned some type of scope, kit, etc....

thoughts?
05-05-2012, 01:32 PM   #14
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I believe they get paid to clean sensors as a service, therefore their opinion is moot. There's threads on the details of doing it yourself if you search, also probably some youtube videos.
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