Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-19-2011, 07:11 AM   #1
Veteran Member




Join Date: Sep 2006
Location: Netherlands
Photos: Gallery
Posts: 908
Dustdevils, stains and halo's

So I received my fourth body and did a test.....
Oh nooo, some specs which did show the "halo effect".....
Well, at leat no strings of stains but the "halo"effect was one of the key features of the stain.... So here I was again....
Someone said "try cleaning anyway" and I did... While I did find that my blower was very dirty (many new specs) the original specs were gone and many of the new specs also had the halo....

So I think the halo effect is NOT typical of the stains but may occur with certain dust specs as well... Maybe we can eliminate quite a few stained bodies after all....

Diffraction around dust particles?? maybe in combination with the pixel density??

02-19-2011, 07:35 AM   #2
Veteran Member




Join Date: Aug 2007
Photos: Gallery
Posts: 1,563
Well Janneman, I agree, Pentax is delivering new camera's with dirty sensors, new out of the box.
Mine had the same problem.
Somebody at Quality Control of the Pentax factory should his/her's ass kicked!

About the Rocket Blower, I had a new blower where some of the solvent of the rubber was still inside the blower.
The blower was packaged in a plastic bubble, preventing the solvents to evaporate.

My first cleaning action, like yours, removed all specs, but introduced new rubber specs sticking onto the sensor.
I had to WET CLEAN the sensor to get it off!

Several month later now the blower is fine...

Good luck with that.

- Bert
02-19-2011, 07:37 AM   #3
New Member




Join Date: Sep 2009
Location: Pennsylvania
Posts: 21
So all is well?

Sounds as if all is well and with some routine cleaning you will have a great camera.
02-19-2011, 09:45 AM   #4
Veteran Member




Join Date: Sep 2006
Location: Netherlands
Photos: Gallery
Posts: 908
Original Poster
QuoteOriginally posted by mgm2 Quote
Sounds as if all is well and with some routine cleaning you will have a great camera.
Yes I think so, but what struck me is the halo-like appearance of mere dust specks as that was said to be the sign of stains....

02-19-2011, 09:49 AM   #5
Senior Member
KansasHorizons.com's Avatar

Join Date: Jan 2010
Location: Kansas
Photos: Gallery
Posts: 183
QuoteOriginally posted by janneman Quote
So I think the halo effect is NOT typical of the stains but may occur with certain dust specs as well... Maybe we can eliminate quite a few stained bodies after all....

I found this on the sensor after running some video: 100% crop. Background was a yellowed wall.



Halo and all.... What say you?
02-19-2011, 02:54 PM   #6
Veteran Member




Join Date: Sep 2006
Location: Netherlands
Photos: Gallery
Posts: 908
Original Poster
QuoteOriginally posted by KansasHorizons.com Quote

Halo and all.... What say you?
Nased on all previous stain reports (until I stopped readin them ) I'd say, "stain" but now that I have found ordinary dust looks like that as well I am inclined to say "dust". Just give it a few blows with a blower and you will see what happens...
02-19-2011, 03:07 PM   #7
Senior Member
KansasHorizons.com's Avatar

Join Date: Jan 2010
Location: Kansas
Photos: Gallery
Posts: 183
QuoteOriginally posted by janneman Quote
Nased on all previous stain reports (until I stopped readin them ) I'd say, "stain" but now that I have found ordinary dust looks like that as well I am inclined to say "dust". Just give it a few blows with a blower and you will see what happens...
And that is exactly what I tried first after the "Oh hell" and that is all it took to rid myself of that "Stain". I also wonder how many dust cases went back due to that halo.
02-19-2011, 03:44 PM   #8
Veteran Member




Join Date: Sep 2006
Location: Netherlands
Photos: Gallery
Posts: 908
Original Poster
QuoteOriginally posted by KansasHorizons.com Quote
And that is exactly what I tried first after the "Oh hell" and that is all it took to rid myself of that "Stain". I also wonder how many dust cases went back due to that halo.
Hehe, my previous three bodies did have them in strings so I am more or less innocent but yeah, I am wondering about that as well.

02-19-2011, 04:51 PM   #9
New Member




Join Date: Dec 2010
Location: Bucharest
Posts: 20
Hi all,

I had the same problem. After first body with stain I receive second with this spots visible from f16 and up. Two spots first in line and after some photos third one. I take a risk and use a racket blower and guess what: they disappeared. All have a small halo around, but it seems it is just dust.



02-20-2011, 01:52 AM - 1 Like   #10
Veteran Member




Join Date: Dec 2010
Location: Frog-eaters country
Photos: Gallery
Posts: 359
I don't think it's a very good idea to create a post each time someone found some dust on a sensor...
02-20-2011, 02:15 AM   #11
Pentaxian
philbaum's Avatar

Join Date: Oct 2007
Location: Port Townsend, Washington State, USA
Posts: 3,659
QuoteOriginally posted by bymy141 Quote
Well Janneman, I agree, Pentax is delivering new camera's with dirty sensors, new out of the box.
Mine had the same problem.
Somebody at Quality Control of the Pentax factory should his/her's ass kicked!

About the Rocket Blower, I had a new blower where some of the solvent of the rubber was still inside the blower.
The blower was packaged in a plastic bubble, preventing the solvents to evaporate.

My first cleaning action, like yours, removed all specs, but introduced new rubber specs sticking onto the sensor.
I had to WET CLEAN the sensor to get it off!

Several month later now the blower is fine...

Good luck with that.

- Bert
I have also heard that old buna-N rubber can give off an oil (but hopefully, mfr would not use a rubber like that) I keep my rocket blower in a zip lock baggy. But i think its unwise for anyone to use a blower with suspected dirt or oil in it. buying a new one is cheaper than recovering from a dirty old one - i think.
02-20-2011, 03:43 AM   #12
Veteran Member




Join Date: Aug 2007
Photos: Gallery
Posts: 1,563
QuoteOriginally posted by philbaum Quote
I have also heard that old buna-N rubber can give off an oil (but hopefully, mfr would not use a rubber like that) I keep my rocket blower in a zip lock baggy. But i think its unwise for anyone to use a blower with suspected dirt or oil in it. buying a new one is cheaper than recovering from a dirty old one - i think.
Well, that did not work for me.

I had stains on my K10D 2 years ago, went to the camera shop and bought a brand new Rocket Blower. Took it out of the plastic bubble and used it...
That's when it sprayed small rubber particles on my sensor.

Now the blower is fine... I prefer old ones

- Bert
02-20-2011, 10:33 AM   #13
Pentaxian
philbaum's Avatar

Join Date: Oct 2007
Location: Port Townsend, Washington State, USA
Posts: 3,659
QuoteOriginally posted by bymy141 Quote
Well, that did not work for me.

I had stains on my K10D 2 years ago, went to the camera shop and bought a brand new Rocket Blower. Took it out of the plastic bubble and used it...
That's when it sprayed small rubber particles on my sensor.

Now the blower is fine... I prefer old ones

- Bert
Yikes - now we have to worry about blowers with halo's - its all getting so complicated
02-21-2011, 01:17 AM   #14
Veteran Member




Join Date: Apr 2010
Location: Suomi , Finland
Posts: 373
Oli minunkin K-5 paikallisessa Pentax takuhuollossa 10 pv tahrojen takia. Tuli takaisin kaikki piti olla kunnossa ja luki viestissä ei enään vikoja. Innoissani otin heti testikuvat ja pääsi itku, kun tahrat oli samoilla paikoilla, kun ennen huoltoakin. Lähetin huoltoon sähköpostia mallikuvat ennen ja jälkeen huollon. Soitin viellä huoltoon ja ja selvitin tämän siellä pyysivät lähtämään kameran takaisin huoltoon. Nytten on K-5 ollut 11 pv reissussa ja jännitän onko tullut lisää tahroja vai onko entiset vain pahentuneet. En silti K-5 mielelläni vaihda johonkin Canoni tai Nikoni.
02-23-2011, 01:23 PM   #15
Site Supporter
Thomas Backa's Avatar

Join Date: Feb 2009
Location: Turku, Finland
Photos: Gallery
Posts: 38
100% crop from a ISO80 f/22 shot of the sky today. Good news is that those three specks are visible on the sensor. Bad news is that they don't come off with a blower.


Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, dust, k-5, k-5 ii, k-5 iis, k5, pentax k-5, specs, stains
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
good news ?? no more stains... dcmsox2004 Pentax K-5 1 01-31-2011 06:48 PM
Are the sensor stains really that bad?? bobby_navy Pentax K-5 6 12-29-2010 04:19 PM
Abstract K-5 stains Rense Post Your Photos! 18 12-26-2010 01:03 PM
Why not K7 stains? Paunel Pentax DSLR Discussion 4 12-25-2010 01:27 PM
% of k5 showing stains on sensor? stormcloud Pentax K-5 2 12-05-2010 08:41 PM



All times are GMT -7. The time now is 05:35 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top