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-   -   Has anyone experienced these artifacts? (https://forums.steves-digicams.com/olympus-dslr-40/has-anyone-experienced-these-artifacts-93803/)

Schu Jun 28, 2006 2:01 PM

http://schu.zoto.com/img/original/5f...9b28093f9-.jpg







This is a blow up of a section... e300 at f/22 extremely long exposure. iso100.

I get rally great pics at other f/stops and normal exposure times, is this a function of the ccd not getting enough light? is it dirt? it appears in the same spots on every LONG nighttime exposure

Schu Jun 28, 2006 2:20 PM

thanks... I found my own answer

Mikefellh Jun 28, 2006 7:56 PM

Just in case you found the wrong answer, the little dots are called "hot pixels"...it happens during long exposures as the CCD of the camera heats up. You can reduce it by turning on noise reduction, but it will take longer until a picture is written to the card because after an exposure the camera then takes a second "black" exposure, and it will use that second (black) exposure to subtract most of the hot pixels from the first exposure.

Schu Jun 28, 2006 10:12 PM

excellent, thanks for going over just so I would be clear, I appreciate it. I have already done tests and indeedthey were hot spots

peace

Schu


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