OK, here are my test. The results of some of the tests revealed how this stuff works and how a better set of tests might be run. More coming soon.

http://www.matterofchance.com/gs400/latitude.html

Also, there is more discussion on this topic here.

Hi Joshua,

Thank you very much.

You are brilliant.

Regards
Leigh

Thanks
 

Joshua, you sure did a thourogh test, it is very enlightening, Thank You!

Hi Joshua,

Do you know zebra in GS400 is 100% based or 70%-80%?

TIA

Regards
Leigh

Leigh,

It differs depending on mode (NORMAL vs. PROCINEMA / PICTURE ADJUSTMENT or not). In NORMAL it's 100%. In PROCINEMA, I believe it showed as 110% in one of my tests. With PICTURE ADJUSTMENT set to CONTRAST -5, it showed up at 85% in NORMAL and PROCINEMA.

Josh

Hi Joshua,

Thanks for the answer.

May I ask how you test and get these numbers? Just curious and I want to test to get these numbers myself?

TIA

Regards
Leigh

Leigh,

You can light up white card, frame it up, and open the iris until you start to see zebras. Record a second or two, bring it into an NLE and pull up a vectorscope. It should show you the IRE levels. I've done this with Premiere Pro 1.5. I did this in all the modes described, but I rushed, so I can't stand behind the figures, but I'd be interested to see if you come up with the same.

Josh

Hi Josh,

Great

Thank you very much.

I will try tonight.

Regards
Leigh