Could someone with 5DmkIII make a darkframe @ISO1600?

Started Mar 27, 2012 | Discussions thread
bronxbombers Forum Pro • Posts: 18,226
Re: What's going on here?

cs hauser wrote:

Dominique Dierick wrote:

Long exposure noise test at 1600 ISO for astrophotography. Each image 300s at room temperature. No noise reduction, darkframe stretched equally (you wouldn't run in anything like this in regular photography, rest assured...).

How could the 5D3 look soooo much better than the 5D2? Some people estimate between 1/3 to 2/3 stop difference in RAW under normal shooting conditions. What is it about a 300s exposure at ISO 1600, that could yield such a drastically different noise signature?

there is a difference between read noise and SNR and long time frame read noise

it is the SNR where it's probably only 1/3-2/3 stop better

but in the very deepest, darkest shadows it may do better than that comparatively

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