K5 sensor stain or something else


Tringa

Link Posted 28/09/2011 - 19:45
I have had my K5 for only a few days now and enjoying playing with it.

This morning one of shots showed an odd artifact in the centre -




I did a test shot against a plain wall and it is clearly visible again -




My first thought was a sensor stain, but all the examples I have seen on the Web are like spots. This looks more hair like.

I used the K5's dust removal routine which had no effect and the dust alert option showed nothing in the position of this problem. I tried to use the option to raise the mirror so I could blow air across the sensor, but the battery did not have enough charge to do this. So that may have to wait until tomorrow.

Also tried a few shots this evening and it is still there.




The retailer will happily replace the camera, but only after Pentax have confirmed there is a problem (the retailer has been caught out in the past by replacing faulty equipment where the fault had been caused by the user)

Problem is in the next couple of weeks I'm going to some special places and I don't want to be without the camera, so it looks as if I'll have to work around it - not impossible but it will be a bit of a bind and obviously it needs fixing.

So any suggestions on what this may be and how to remedy it will be appreciated.

Thanks

Dave

Mike-P

Link Posted 28/09/2011 - 19:52
Dust (or a hair)

Do you have a rocket blower?
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ChrisA

Link Posted 28/09/2011 - 19:52
Well it's definitely something on the sensor. It doesn't look anything like any of the pictures of sensor stain I've seen, and it does look very much like a hair, or a fibre.

The dust-removal system was virtually useless in four years of K10D use, and although I expect it's better on the K-5, I wouldn't be in the least surprised if you can get stuff on there that it won't shift.

It only needs to be slighty sticky, and the Arctic Butterfly (search the forum for that term) won't shift it, and there's no alternative to a wet clean. Lots of stuff around here on how to do that - don't be afraid of doing it yourself.
.
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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Last Edited by ChrisA on 28/09/2011 - 19:53

ChrisA

Link Posted 28/09/2011 - 19:54
Mike-P wrote:
Do you have a rocket blower?

I *so* would never use this technique any more.

Although I would concede that the crap you'll blow in there will be smaller than that monster.
.
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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woodworm

Link Posted 28/09/2011 - 19:55
Could it be on the back element of the lense rather that the sensor?

Mike-P

Link Posted 28/09/2011 - 19:58
ChrisA wrote:
Mike-P wrote:
Do you have a rocket blower?

I *so* would never use this technique any more.

Although I would concede that the crap you'll blow in there will be smaller than that monster.

I always turn the camera face down and blow inwards from below, hopefully any dust should fall out rather than be blown around the camera.

Very rarely have a problem with dust but when I do this is the method I try first and it works 99.9% of the time.
. My Flickr

Tringa

Link Posted 28/09/2011 - 20:41
Thanks for the comments.

I did a plain wall test with an old SMC 1.8 55mm lens too and the mark was still there.

Dave

Tyr

Link Posted 28/09/2011 - 20:48
It definitely looks like a fibre on the sensor. Invest in an Arctic Butterfly as the dust shake feature can't clean some things out as they will just come back eventually.
Regards,
Dan

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

bychan

Link Posted 29/09/2011 - 01:06
Tyr wrote:
It definitely looks like a fibre on the sensor. Invest in an Arctic Butterfly as the dust shake feature can't clean some things out as they will just come back eventually.

A few days old K5, and I certainly would not be looking to be spending another 80-90 on an arctic butterfly to clean the sensor

Adrian
K5IIs, Sigma 10-20, Pentax DA 16-85, Pentax DA 55-300, Pentax 70 Ltd, Metz 44 AF-2.
Flickr: http://www.flickr.com/photos/ambott/

Transit

Link Posted 29/09/2011 - 03:43
ChrisA wrote:
Mike-P wrote:
Do you have a rocket blower?

I *so* would never use this technique any more.

Although I would concede that the crap you'll blow in there will be smaller than that monster.

There is some truth in the above view
Following this debacle I give it lots of preliminary puffs to clear out the wildlife...
Pete



K-1 K-01 Q-7
some len

Close to the Edge
Down by the River
Last Edited by Transit on 29/09/2011 - 03:44

Mike-P

Link Posted 29/09/2011 - 05:58
How the hell did you blow a spider in there?
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Last Edited by Mike-P on 29/09/2011 - 05:59

ChrisA

Link Posted 29/09/2011 - 12:51
Mike-P wrote:
How the hell did you blow a spider in there?

Hard enough to squish it against the sensor by the look of it.

Hopefully it's that rather than the aftermath of jamming the end of the blower against the sensor a little overenthusiastically.
.
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)
.

Gwyn

Link Posted 29/09/2011 - 13:09
bychan wrote:
Tyr wrote:
It definitely looks like a fibre on the sensor. Invest in an Arctic Butterfly as the dust shake feature can't clean some things out as they will just come back eventually.

A few days old K5, and I certainly would not be looking to be spending another 80-90 on an arctic butterfly to clean the sensor

Adrian

Why not? It isn't something you use every day it's true but it is something which will get used fairly regularly. It doesn't stop working just because you change cameras either - mine is now used on my K-5 after being used on both the Ds and K20d. I think it was a very fine investment, far better than swabs and cleaning fluid, which do run out and need replacing.

Hyram

Link Posted 29/09/2011 - 13:36
I had something similar on my K20, which would not budge until I bought an Arctic Butterfly - job done.
Hyram

Bodies: K20D (2), K10D, Super A, ME Super, Auto 110 SLR, X70, Optio P70
Pentax Glass: DA* 300, DA* 60-250, DA* 50-135, DA* 16-50, DA 70 Ltd, FA 31 Ltd, DA 35 Ltd, DA 18-55 (2), DA 12-24, DA 10-17, M 200, A 35-70, M 40, M 28, Converter-A 2X-S, 1.4X-S, AF 1.7, Pentax-110 50, Pentax-110 24
Other Glass: Sigma 105 macro, Sigma-A APO 75-300
Flash: Metz 58 AF-1 P, Pentax AF160FC ringflash, Pentax AF280T

Frogherder

Link Posted 29/09/2011 - 14:47
I've got something very similar in they eyepiece of my K10D. Happily it doesn't photography. It appeared after I'd had it on the sensor and gave it a blast with a rocket puffer. Just goes to show the bits don't necessarily come out (per JR's comments ages ago I had the body pointing down at the time)


Incidentally is there any advantages in buying a more expensive Arctic Butterfly over the basic one?

Regards

Bernard
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