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Tuesday, January 18, 2011

60D Dynamic Range : Part 2


What started out as a simple question has become a more complicated answer. There are a lot of people out there saying "Just Shoot Flat" on the web. In what is now the first part of this series of tests, I'll say yes. In high contrast situations like snow in sunlight, by all means turn down the contrast control. In taking a look at the 60D's dynamic range I had a question thrown at me - am I looking at a NLE / software scope or hardware scope in judging whats going on ? I have both so I put them to the test. 
Let me explain and show you something interesting. In the first part I talked about if 100 IRE = 235 or 255. On the scopes in my NLE, the codec was clearly clipping at 100 IRE, there was nothing above. If I plug the 60D's composite out into my Tektronix scope there is a surprise, over brights ! In the image below you can see that I've got whites hitting about 105 IRE. I could not get anything hotter then that from the camera. The flat top areas at about 97 IRE are in fact the onscreen text overlays. So in response to the poster, yes the camera puts out hotter then 100 IRE on its video outs, but the codec which you actually record to ins't giving it to you. In a word, that sucks, Canon, H264 has more to offer then what you have limited us to. Let us have everything the spec can handle : 10 bit 4:2:2 or 4:4:4. 


scopes showing 60D output