Classroom lighting: SLOG2? at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony Digital Cinema Camera Systems > Sony XDCAM PXW-FS7 / FS5

Sony XDCAM PXW-FS7 / FS5
Super 35 CMOS recording 4K to XQD media cards.


Reply
 
Thread Tools Search this Thread
Old February 8th, 2016, 11:06 AM   #1
Major Player
 
Join Date: Apr 2006
Location: Amsterdam
Posts: 355
Classroom lighting: SLOG2?

I have a shoot coming up in a school. There'll be a lot of neon light and daylight in the classroom, I assume. I've been experimenting with different gamma settings on my FS7 but I'm still unsure if SLOG2 (in Cine EI) would be the best option for these types of situations.

Anyone care to reflect/share their experience?
__________________
www.imaginevideo.nl Just published the second of my viral mini-doc series '100'
https://youtu.be/ZqHFBrV-oOc
Jeroen Wolf is offline   Reply With Quote
Old February 8th, 2016, 11:32 AM   #2
Sponsor: Westside AV
 
Join Date: Dec 2008
Location: Mount Washington Valley, NH, USA
Posts: 1,365
Re: Classroom lighting: SLOG2?

The decision of how to shoot is really based on what dynamic range you need.

This is easy to figure out, either with a light meter, if you have one and know how to use it. Or by using scopes.

If you have 7 stops or less dynamic range shoot REC709
If you have 8-12 stops use a HyperGamma.
If you have 13 or more stops, use Slog CineEI.

These are just guide lines. Experiment.

More problematic may be the color balance in mixed light. Once again experiment. Go there the day before the shoot and try different setups, than go back to your NLE/CC suite and see what works the best. Then you will know. Neon and LED lights can be a nightmare, (did you really mean Neon or do you mean fluorescent, they tend to be a bit green).

I always try to shoot in Custom. Because you can WYSIWYG the images on a good field monitor. I use the Odyssey 7Q+, then you can easily figure out a custom setup or see a LUT version of Log.
__________________
Olof Ekbergh olof@WestsideAV.com
Westside A V Studios http://www.WestsideAVstore.com/
Olof Ekbergh is offline   Reply With Quote
Old February 8th, 2016, 11:54 AM   #3
Major Player
 
Join Date: Apr 2006
Location: Amsterdam
Posts: 355
Re: Classroom lighting: SLOG2?

Thanks, Olof, iI like the way you break that down.

I don't have a light meter nor would I know how to use it...

How would you determine dynamic range with scopes?

And you were right, it's fluorescent light, not neon. (that was a direct translation from Dutch)

I know fluorescent is a nightmare- and especially when mixed with daylight and that's why I asked.

I don't have time to visit. This is quick in and out. I think I'll go Custom with Hypergamma's, just to be on the relatively safe side. I don't have an external monitor; I use the VF on the FS7.

I still have a lot of experimenting to do- but you can't simulate every situation. I need to go to work with this camera. (dare I say make money and experiment at the same time?! It's a calculated risk :-)
__________________
www.imaginevideo.nl Just published the second of my viral mini-doc series '100'
https://youtu.be/ZqHFBrV-oOc
Jeroen Wolf is offline   Reply With Quote
Old February 8th, 2016, 11:57 AM   #4
Major Player
 
Join Date: Jan 2010
Location: Tinton Falls, NJ
Posts: 749
Re: Classroom lighting: SLOG2?

Neon light ??? -- Do you mean fluorescent??
First questions are - how different are the interior lighting colors from the daylight coming through the windows? Is the difference in colors a problem?
Are they using a projector in the classroom? (Most of the classrooms I've shot docu footage in lately have used one) We need to limit light to make screen contrast/ image quality better.
We usually try to control the daylight coming in so as not to wash out the screen - and try to get the color temperatures closer to each other, sometimes killing the overheads and using HMI & Daylight LED lighting instead.
Are the skin tones / uniforms of the students light of dark? / are they moving all over the classroom or staying at their desks? Is gelling the windows an option? Are you trying to maintain detail outside the windows or can they burn out?

Have you done a lot of color correcting of s-log2? Many people find it more difficult to correct than s-log 3.
Dave Sperling is offline   Reply With Quote
Old February 8th, 2016, 12:23 PM   #5
Major Player
 
Join Date: Apr 2006
Location: Amsterdam
Posts: 355
Re: Classroom lighting: SLOG2?

Thanks for your input, Dave. I guess our posts crossed because I answered a number of your questions in my previous post.
The beamer is going to look washed out. No time to use gels.No time to do anything other than make the best out of the (short) situation, really.

The teacher is an important charachter to follow. I'll give her a lav and it would be nice if I could get a few interesting quotes from her. And I can shoot a few students/class situations at random for illustration purposes. It's all b-roll, really. I'll be shooting a few interviews with natural light or an on-camera light as my main light source.

I am quite unfamilair with grading. I use FCP X and have installed LUT Utility and have slapped some LUT's on the SLOG footage. Daylight footage is much easier to grade than tungsten lit video, I've discovered. Particularly skin tone. Interesting that you don't find a lot of tutorials on grading skin tone with SLOG footage shot with lamps and or uncontrolled lighting. Probably because it makes more sense shooting Hypergamma or REC709.

I shoot alone, by the way, and need to move fast.
__________________
www.imaginevideo.nl Just published the second of my viral mini-doc series '100'
https://youtu.be/ZqHFBrV-oOc
Jeroen Wolf is offline   Reply With Quote
Old February 8th, 2016, 04:18 PM   #6
Major Player
 
Join Date: Jan 2010
Location: Tinton Falls, NJ
Posts: 749
Re: Classroom lighting: SLOG2?

So my advice is...
Position yourself on the windows side of the room so you don't have to deal with seeing overexposed windows. If there are windows visible, use shades or posters to block parts.
Turn off the overhead lights - that will eliminate mixed color problems.
Use a hypergamma rather than s-log because it will be easier for you to correct if you're not good with s-log.
Add a little fill from a daylight-colored source if you can (even a 1x1 LED can be a big help).

That's what I would do. Others may have different ideas.
Dave Sperling is offline   Reply With Quote
Old February 11th, 2016, 04:20 AM   #7
Major Player
 
Join Date: Apr 2006
Location: Amsterdam
Posts: 355
Re: Classroom lighting: SLOG2?

Thanks, Dave. Things worked out pretty good in HG8. Got some CC work to do- depending on what angle you shoot, colors change quite a bit. But there was nothing I could do about that. Add to that the fact that most high school classrooms are pretty boring visually and the result will never be 'eye-candy'...

But I'm very happy with the interviews. Shot in STD5 with available light with the Canon FD 50mm 1.4, it sure makes up for the rather drab classroom footage.
__________________
www.imaginevideo.nl Just published the second of my viral mini-doc series '100'
https://youtu.be/ZqHFBrV-oOc
Jeroen Wolf is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony Digital Cinema Camera Systems > Sony XDCAM PXW-FS7 / FS5

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:41 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network