Canon 1DC - ISO vs Dynamic range

[macgregor]

I felt like testing how the ISO setting on this camera affects the dynamic range. I found out it works in a similar way to the C300 family, and not so much not like in the DSLRs.

As described in the instructions manual, ISO 400 seems to be giving the best quality. At ISO 200 you can clearly tell the camera is clipping the highlights, which probably means the sensor is working at 400 and a negative digital gain is applied, therefore, clipping the last stop in the highlights around the bulbs.

 

[Samuel H]

nice

(you get to play with all the fun toys! I was going to say "not fair" but actually, no, it's probably fair...)

 

[squig]

It would be interesting to see a direct comparison between the C100 and the 1DC S35 crop.

 

[J Davis]

c300 for reference

 

[squig]

The 1DX is measured at 11.8 stops RAW and around 10 stops for JPEG stills, so with c-log I would imagine somewhere around 11 stops on the 1DC.

http://www.techradar.com/au/reviews...gital-slrs-hybrids/canon-1dx-1091200/review/5

 

[Samuel H]

check out macgregor's post here: http://www.dvxuser.com/V6/showthread.php?288192-Just-got-a-new-camera-Sony-F35/page32

 

[Donald Ong]

check out macgregor's post here: http://www.dvxuser.com/V6/showthread.php?288192-Just-got-a-new-camera-Sony-F35/page32

Sorry to derail this thread...but holy cow! The 5d3 does 12 stops with cinestyle?!?! Wow. Looks like I'll start shooting iso 400 more often. ISO 100 can go suck a lemon! :laugh:
But I guess it makes sense. Cinestyle does give you tonnes of room in the shadows...whether it's filled with noise is another story.

 

[Guest]

Sorry to derail this thread...but holy cow! The 5d3 does 12 stops with cinestyle?!?! Wow. Looks like I'll start shooting iso 400 more often. ISO 100 can go suck a lemon! :laugh:
But I guess it makes sense. Cinestyle does give you tonnes of room in the shadows...whether it's filled with noise is another story.

Take those test with a grain of salt. Even the mac says it does not represent usable dynamic range, just what he thinks is the limits. So 12 in this test may mean 10 in neutral and 11 in cinestyle in other tests.

 

[Samuel H]

And at iso 100 I've never got 12 stops on any Canon, my maximum was 11.7 with Flaat_12, and technicolor was around 11.
But I'm not surprised that different people get different results, these methods we are using are not 100% accurate. Half a stop of error would be very normal, and my error can be downwards and his upwards.

 

[Guest]

Also, I am curious as to where the whole stop discrepancy is going on from the DxOmark test on the 1D-X. It is rated as 11.9 DR in RAW. Is C-log surpassing raw?

 

[Samuel H]

Probably not, macgregor said his measure is absolute DR (if there's detail, it counts) whereas IIRC dxomark's result is usable DR (it only counts if the SNR is above a certain threshold)
I prefer to look at absolute DR, unless you have the tools to quantify SNR. Otherwise, "usable" is just subjective.