Lucas Mormandi Posted October 6, 2008 Share Posted October 6, 2008 A had only two oportunitys to test it, and not so deep. And I still have this question. Wich is the ASA to shoot with LOG C curve? Wich is the real ASA of the D 21? Thanks for your help! Lucas Mormandi Cameraman - DIT Argentina Link to comment Share on other sites More sharing options...
Rob van Gelder Posted October 7, 2008 Share Posted October 7, 2008 As I have seen from the menu and heard from the explanation from the Arri technician, it is 200 ASA using the Log curve, when using the HD mode you will have several "electronic" sensitivities, from 100 to 800 ISO/ASA. This will also change the contrast and the noise (similar as with film). It is like the gain setting on normal video cameras: -3 dB, 0, +3 dB, + 6 dB. Rob van Gelder Bangkok Link to comment Share on other sites More sharing options...
Lucas Mormandi Posted October 7, 2008 Author Share Posted October 7, 2008 As I have seen from the menu and heard from the explanation from the Arri technician, it is 200 ASA using the Log curve, when using the HD mode you will have several "electronic" sensitivities, from 100 to 800 ISO/ASA. This will also change the contrast and the noise (similar as with film). It is like the gain setting on normal video cameras: -3 dB, 0, +3 dB, + 6 dB. Rob van Gelder Bangkok So. You say that if I work whith Log C curve, I tell the DOP to use the photometer in ASA 200? Remember this is an ARRI D 21. Fortunetly, I work tomorrow in linear mode. Thank´s Rob!!! Link to comment Share on other sites More sharing options...
Premium Member Keith Mottram Posted October 7, 2008 Premium Member Share Posted October 7, 2008 So. You say that if I work whith Log C curve, I tell the DOP to use the photometer in ASA 200? Remember this is an ARRI D 21. Fortunetly, I work tomorrow in linear mode. Thank´s Rob!!! I do not know why you would want to work linear, get your tests into a decent grading suite and you'll quickly see the benefits to shooting log... Link to comment Share on other sites More sharing options...
Rob van Gelder Posted October 8, 2008 Share Posted October 8, 2008 Just need to be careful with the highlights. HD and video is like positive (slide) film, so when you reach the top , the end in the highlights you are about to loose detail. Over-exposure is difficult to correct and most likely degrades the image, while underexposure can be lifted to a certain degree. In one test we did with the Sony F35 we found that for instance skin-tones ( similar to 18% grayscale, approx.) overexposed for 4 stops are recoverable, but that cannot be said for the background which usually has lighter parts to begin with. Rob van Gelder,Bangkok Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now