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Stuck pixels, dust?

Started Jul 23, 2017 | Discussions
M_digicapt Veteran Member • Posts: 3,289
Stuck pixels, dust?

Hi, the first picture is a really bad shoot I took with the E-PM2. Still getting use to it, is quite different from my other two cameras. Anyhow, I zoomed in to inspect it before deleting when I noticed white dot/pixels sprinkled through all over. I already has done pixel mapping and blown air to the sensor. I used one of the special lens swabs to sweep the sensor, pixel mapped again, turned on the noise reduction, switched to a different lens and took the second shot. There is less of them but still some, same place when taking a photo of a different thing. They only seem to show in high ISO or under exposed shots. Is the anything worse than dead/stuck pixels/dust I should be checking for?

Thanks.

F5.4 SS1/125 ISO3200 132mm High Saturation, Hard Sharpness,Digital Zoom 1

Olympus PEN E-PM2
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Bangers and Mash
Bangers and Mash Veteran Member • Posts: 3,010
Re: Stuck pixels, dust?

From close examination, I could see some tiny speckles. Try shooting at a clear blue sky with the lens closed down to around f/11. That's how I determined that my Panasonic LX100 had lots of dust on the sensor or lens element. I couldn't tell whether or not it was the sensor or lens element because it was a fixed zoom lens.

Do you have a camera store near by that has a repair department? They could determine what it is.

Cheers

Wayne

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OP M_digicapt Veteran Member • Posts: 3,289
Re: Stuck pixels, dust?

Thanks, sadly I don't have a repair shop near me...

Should I try to send it back?

Bangers and Mash
Bangers and Mash Veteran Member • Posts: 3,010
Re: Stuck pixels, dust?

M_digicapt wrote:

Thanks, sadly I don't have a repair shop near me...

Should I try to send it back?

If you are not happy with the camera, and you feel there is an issue beyond what you yourself can rectify, I would send it back. If, of course, they will refund.

Me, I will not keep something that I'm not totally happy with. Just my opinion, mind you.

Whatever you decide to do, I hope I wish you well with it.

Cheers

Wayne

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paul cool
paul cool Veteran Member • Posts: 3,137
Re: Stuck pixels, dust?

Where are we meant to be looking is it the white specs on the windows in the first bottom right corner in the second image i see nothing but black .

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OP M_digicapt Veteran Member • Posts: 3,289
Re: Stuck pixels, dust?

paul cool wrote:

Where are we meant to be looking is it the white specs on the windows in the first bottom right corner in the second image i see nothing but black .

The same kind of specks are visible on the second photo when I zoom 10x on the camera's screen and on my computer 66% in Photoshop, but at 100% they are quite distracting. Cropped photos will sometime need fixing.

I was reading a thread here not long ago where people said they have never cleaned their sensors or once in many years and was wondering whether this specs are normal or not.

Any advice or links greatly appreciated.

Guy Parsons
Guy Parsons Forum Pro • Posts: 40,000
Re: Stuck pixels, dust?

M_digicapt wrote:

Hi, the first picture is a really bad shoot I took with the E-PM2. Still getting use to it, is quite different from my other two cameras. Anyhow, I zoomed in to inspect it before deleting when I noticed white dot/pixels sprinkled through all over. I already has done pixel mapping and blown air to the sensor. I used one of the special lens swabs to sweep the sensor, pixel mapped again, turned on the noise reduction, switched to a different lens and took the second shot. There is less of them but still some, same place when taking a photo of a different thing. They only seem to show in high ISO or under exposed shots. Is the anything worse than dead/stuck pixels/dust I should be checking for?

Thanks.

Frankly, I could see no speckles at all in the first image, it looked as expected. Some weirdness due to jpeg effects and excessive sharpening, that's all.

In the case of real (white) speckles due to noisy pixels, the pixel map should fix that. Or careful use of noise reduction. Personally I never use noise reduction in camera and use low sharpening, then it is easier to post process fix any issues that annoy.

Dirt/dust on the sensor will show as a dark blurry smudge (never light) which becomes more obvious when using f/11, f/16 etc but may be invisible at say f/8 or f/5.6

I have never cleaned any of my sensors in many years now and results wide open to say f/11are always good, but a clear sky shot at f/22 may show dust. I ignore that.

Regards.... Guy

OP M_digicapt Veteran Member • Posts: 3,289
Re: Stuck pixels, dust?

Tried similar shots with my other cameras and there were no white specks, so I just wanted to be sure everything was alright...

I usually shoot raw+jpeg too (not yesterday though because I was trying out the camera and only had a 4gb card), turned on the noise reduction to see if it made any difference. The high sharpness, saturation and digital zoom where either part of the vivid jpeg profile or set by the previous owner. I find Olympus' menus rather unorthodox... Tomorrow I'm going to sit down to read the manual and the E-PL5 comments page you posted last week.

BTW, you where absolutely right about the 2 axis IBIS. Better than nothing, but my ZS50's 5-axis Optical Image Stabilization is years ahead.

Thanks!

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