OLPFS NIGHT TEST

[Patrick Kendall]

I got my Low Light Optimized OLPF today, so I decided to do some quick nighttime comparisons with the Skin Tone/Highlight OLPF. Shot with only street light with the iris wide open. Here are some ungraded jpgs.

 

[Brad Allen]

Hey Patrick,

Did you change the profile in camera when you switched OLPF's? Just trying to work out why there is such a difference in color balance?

 

[Patrick Kendall]

I didn't change anything between tests other than the OLPF setting in the menu.

 

[Elsie N]

That's quite a pronounced difference. Curious to know if there is that much difference between the two in daylight.

 

[Mikael Lubtchansky]

Thanks Patrick
It would be interesting if you could post a few .R3D single frames to look at grading options and grain structure
As it is now with jpeg only we cannot really draw any information on various OLPFs low light performance...

 

[Brad Allen]

I didn't change anything between tests other than the OLPF setting in the menu.

Yeah, that's all I meant. Surprising - I didn't expect there to be this much color variation based on past comparisons. Perhaps some R3D's would illuminate what's going on

 

[Álex Montoya]

That doesn't make any sense. There's something off.

 

[Jacobo Martinez]

I didn't change anything between tests other than the OLPF setting in the menu.

Patrick, i am almost sure when you switch OLPF , in the red menu you also have to change what OLPF is in the camera beacause they have different calibrations. Make sure you did this in camera.

 

[Phil Holland]

Agreed. It actually just looks like the White Balance is off between the two clips or the OLPF Profile is wrong. I've done "a lot" of this sort of testing and didn't see anything like in terms of color variance.

 

[Paul E. McCarthy]

you also need to black shade for each olpf

 

[Jacobo Martinez]

Paul, I really don't think you have to black shade if you change OLPF. BLACK SHADING is only for exposure, temperature changes and new firmware updates.

 

[Jim McKinney]

Patrick, thanks for doing this. It would really be helpful though to get an idea of the noise by looking at a 4K RAW file or image.

 

[Nick Morrison]

Patrick, thanks for doing this. It would really be helpful though to get an idea of the noise by looking at a 4K RAW file or image.

I think he was shooting 6K. Yes an .R3D frame would be great!

PS - awesome job Patrick! Was that one of your Contax primes?

 

[Paul E. McCarthy]

Your correct, you don't have to black shade but you need to select the OLPF in the maintenance menu, page 40 of the manual

 

[Jarek Zabczynski]

Also, they both appear the same in brightness…shouldn't there be a difference? Only difference I see is in tone.

 

[Brian D. Goff]

yeah, where is the +1 stop I should gain with the low-light OLPF? If it's not there, then why use it in the first place?......

 

[David Battistella]

What lens was used "wide open" and at what shutter angle? 360/180?
What was the process? Take a shot, switch OLPFs? Take the next shot?

did you do a shot in between with no OLPF as well?

what version of RCX? Dragon color 2?

Really need r3ds to understand

a. Exposure/settings
b. Where/ how this noticeable shift is happening?



Battistella

 

[Nick Morrison]

Also, they both appear the same in brightness…shouldn't there be a difference? Only difference I see is in tone.

Are we sure changing OLPF's affects the brightness in a scene - ie one OLPF would be brighter than the other at same ISO? (as in what would happen when using a Motion Mount that blocks 1.5 stops of light)

I though the change in OLPF was simply a remapping of the gain floor - so exposure is THE SAME, except one is clean at 320 with expanded highlights, and other is clean at 800 with expanded blacks. The exposure is the same...just the noise floor is different?

Maybe I'm misunderstanding? Love some clarification!

 

[Bob Gundu]

You got it Nick.

 

[Elsie N]

What lens was used "wide open" and at what shutter angle? 360/180?
What was the process? Take a shot, switch OLPFs? Take the next shot?

did you do a shot in between with no OLPF as well?

what version of RCX? Dragon color 2?

Really need r3ds to understand

a. Exposure/settings
b. Where/ how this noticeable shift is happening?



Battistella

But does any of that matter if each shot was the same? My understanding was he changed OLPFs, changed the OLPF setting in the menu, then shot the same exact shot again with the new OLPF using the same settings.

This seems to verify that exchanging the OLPFs is a pretty easy thing.