ISO when using log at DVinfo.net

Brian Drysdale · December 13th, 2011, 03:23 PM

In this test, when shooting log at 20,000 ISO the C300 seems to have the same sensitivity as the other camera at more standard picture profiles set at 6,400 ISO.

That the camera is less sensitive when using a log curve doesn't surprise me, but the impression is the C300 doesn't adjust its ISO display to reflect the lower rating.

Of course, the on screen data could be incorrect.

Don Miller · December 14th, 2011, 09:07 AM

Yes, that is confusing.

Historically Canon has been careful with their ISO ratings. I expect that the rating is technically accurate, but complicated as the compression of dynamic range isn't linear. Perhaps the actual ISO spec isn't as simple as exposing mid grey.

December 13th, 2011, 03:23 PM	#1
Brian Drysdale Inner Circle Join Date: Feb 2006 Location: Belfast, UK Posts: 6,143	ISO when using log In this test, when shooting log at 20,000 ISO the C300 seems to have the same sensitivity as the other camera at more standard picture profiles set at 6,400 ISO. F3 - C300 - 1D side by side on Vimeo That the camera is less sensitive when using a log curve doesn't surprise me, but the impression is the C300 doesn't adjust its ISO display to reflect the lower rating. Of course, the on screen data could be incorrect.

December 14th, 2011, 09:07 AM	#2
Don Miller Major Player Join Date: Mar 2006 Location: Chicago Posts: 706	Re: ISO when using log Yes, that is confusing. Historically Canon has been careful with their ISO ratings. I expect that the rating is technically accurate, but complicated as the compression of dynamic range isn't linear. Perhaps the actual ISO spec isn't as simple as exposing mid grey.