J-Log1 and the LS300

Duncan Craig · March 17th, 2016, 01:15 PM

I shot a commercial in Log yesterday and the rushes look OK.
I used 800 ISO after deciding that it must be the native ISO...

I'm using the new spot meter function to take the following readings:

At 400 and 500 ISO the maximum video level is 400%.
At 640 ISO the maximum video level is 566%.
At 800 and beyond ISO the maximum video level is 800%.

Also, if you work below 800 ISO the max IRE level according to the histogram is below 100%.

So 800 ISO does appear to be the sweet spot in terms of the promised 800% dynamic range.
Lower ISO's will of course result in cleaner pictures (although they look very clean at 800 ISO to me) but you won't be using the full 8 bits to record the signal or capturing the full dynamic range that the camera is capable of.

None of this is documented anywhere that I've seen, so I'm assuming I am correct.

Steve Rosen · March 17th, 2016, 04:31 PM

I have two Spectra meters that I occasionally use, but since getting the Gratical X, and ordering the scopes with it, I've found that I can dial in the correct exposure without removing my eye from the EVF.

The waveform and histogram sit in the black area at the bottom of the screen and a quick glance tells me where I am.

Believe me, I'm not a Zacuto fan boy (I don't like many of their overpriced "recoil" rigs) but if you've got the cash, the Gratical is a tool that will travel along to many cameras before it's obsolete (I hope).

March 17th, 2016, 01:15 PM	#16
Duncan Craig Major Player Join Date: Jul 2003 Location: Leeds, UK Posts: 660 Images: 10	Re: J-Log1 and the LS300 I shot a commercial in Log yesterday and the rushes look OK. I used 800 ISO after deciding that it must be the native ISO... I'm using the new spot meter function to take the following readings: At 400 and 500 ISO the maximum video level is 400%. At 640 ISO the maximum video level is 566%. At 800 and beyond ISO the maximum video level is 800%. Also, if you work below 800 ISO the max IRE level according to the histogram is below 100%. So 800 ISO does appear to be the sweet spot in terms of the promised 800% dynamic range. Lower ISO's will of course result in cleaner pictures (although they look very clean at 800 ISO to me) but you won't be using the full 8 bits to record the signal or capturing the full dynamic range that the camera is capable of. None of this is documented anywhere that I've seen, so I'm assuming I am correct. __________________ FCPX/LS300/EX1/FS100/GoPro/Vinten/HotHead/Jib/Track/Dedos/Lightstorm/Coollights

March 17th, 2016, 04:31 PM	#17
Steve Rosen Major Player Join Date: Dec 2005 Location: Monterey, California Posts: 895	Re: J-Log1 and the LS300 I have two Spectra meters that I occasionally use, but since getting the Gratical X, and ordering the scopes with it, I've found that I can dial in the correct exposure without removing my eye from the EVF. The waveform and histogram sit in the black area at the bottom of the screen and a quick glance tells me where I am. Believe me, I'm not a Zacuto fan boy (I don't like many of their overpriced "recoil" rigs) but if you've got the cash, the Gratical is a tool that will travel along to many cameras before it's obsolete (I hope).