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M200 sensor dust and what are these white pixels?

Started 2 months ago | Discussions
StrugglingforLight Regular Member • Posts: 126
M200 sensor dust and what are these white pixels?

Maybe it was a mistake getting the M200 without it's sensor cleaning functionality. Half joking.

Background: The camera is less than a month old and it's been with the kit lens attached since day 1. It's a Canon refurb and I regret not checking the dust situation when it first arrived for a baseline.

But anyway, what are those white pixels that appear in the 200x zoom image? I notice a few of them in the picture. An issue with the camera? TIA.

Sensor Dust at 45mm, f/40, ISO 100, 30s shutter speed

White pixels from zooming into above. Notice quite a few of them.

OP StrugglingforLight Regular Member • Posts: 126
Re: M200 sensor dust and what are these white pixels?
1

After researching discovered those white pixels are "hot pixels" that occur when doing long exposures. And it's fairly common. Apologies for the dumb thread.

Sittatunga Veteran Member • Posts: 5,406
Re: M200 sensor dust and what are these white pixels?
1

StrugglingforLight wrote:

After researching discovered those white pixels are "hot pixels" that occur when doing long exposures. And it's fairly common. Apologies for the dumb thread.

Not a dumb thread at all.  Canon cameras will map out a lot of those hot pixels if you force a sensor clean from the khaki spanner menu.  I don't think that's possible with the M200 though.

Advi
Advi Regular Member • Posts: 456
Re: M200 sensor dust and what are these white pixels?
1

Take a picture of a blue sky (or white snow) in order to search for dust on the sensor.

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OP StrugglingforLight Regular Member • Posts: 126
Re: M200 sensor dust and what are these white pixels?

Sittatunga wrote:

StrugglingforLight wrote:

After researching discovered those white pixels are "hot pixels" that occur when doing long exposures. And it's fairly common. Apologies for the dumb thread.

Not a dumb thread at all. Canon cameras will map out a lot of those hot pixels if you force a sensor clean from the khaki spanner menu. I don't think that's possible with the M200 though.

The only "workaround" I could find for the M200 is turning on noise reduction for long exposure. That only affects the jpg though, I think. In raw, has to be fixed in post.

Advi wrote:

Take a picture of a blue sky (or white snow) in order to search for dust on the sensor.

That is what picture 1 is showing. It's taken of a light colored wall and adjusted in post to bring out the dust more.

Sittatunga Veteran Member • Posts: 5,406
Re: M200 sensor dust and what are these white pixels?
2

StrugglingforLight wrote:

Sittatunga wrote:

StrugglingforLight wrote:

After researching discovered those white pixels are "hot pixels" that occur when doing long exposures. And it's fairly common. Apologies for the dumb thread.

Not a dumb thread at all. Canon cameras will map out a lot of those hot pixels if you force a sensor clean from the khaki spanner menu. I don't think that's possible with the M200 though.

The only "workaround" I could find for the M200 is turning on noise reduction for long exposure. That only affects the jpg though, I think. In raw, has to be fixed in post.

It works in RAW too, because the camera takes a second, equally long (dark) exposure with the shutter closed and subtracts that from the original light exposure. That's very noticeable with a 30 second exposure.

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