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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Outer ISO space...

I've been following this ISO thing for a while, and it seems to me that the questions (and to some extent the answers) are only confusing me further.

Jim says:

Quote//
1. If you run out of light. Raise your ISO as little as possible given the T-stop of your lens and the light available.
//end quote

Here's what I think it boils down to:

Is there a difference - in the CAPTURED/STORED Image - between A) Doing what Jim says above, or B) simply choosing to underexpose?

Is there?

Jack
 
jacknusa said:
I've been following this ISO thing for a while, and it seems to me that the questions (and to some extent the answers) are only confusing me further.

Jim says:

Quote//
1. If you run out of light. Raise your ISO as little as possible given the T-stop of your lens and the light available.
//end quote

Here's what I think it boils down to:

Is there a difference - in the CAPTURED/STORED Image - between A) Doing what Jim says above, or B) simply choosing to underexpose?

Is there?

Jack
Click to expand...

NO it's essentially the same and then you push your footage to preferred ISO/ASA in REDCine. The only "thing" is that you can "monitor" on set.

Fredrik
 
will the new version of RedCine be able to open and deal with footage shot with pre-build16 AND the one shot with build16, in the same project?
Thanks
 
JIM,

Don't worry about the lost, I'm sure the day Build 16 hits the streets and everyone has had a play, this conversation will die.

Some DOP's for years and years have shot one stock for all conditions. Mainly 500T or 200T, Myself I was a 50D and 250D man.

For me with RED I just pretend I have put a roll of 320D in the mag and shoot accordingly using ND's for the day, Super speeds for the night.
Adjusting ISO's in camera we felt was fruitless. Going to 500 worked fine, but... at the end of the day, no great advantage.

Having good ND's and Good bright glass (super speeds) is what makes this camera rock!

We haven't had any noisy images yet that we didn't like and any blown out high lights that were any worse than any film high lights we have ever had.

People will adapt to the tool as they have with film for the last 40 years or more.
The range isn't as good as a good roll of 500T vision3, yet at the same breath, RED is sharper, cleaner, richer than it.

Keep it coming big fella.
I'm lovin the ride.
 
ISO Metaphor

ISO Metaphor

Changing your ISO is like changing your monitor (headphone) volume when you record audio. It does nothing to what is recorded, it's just monitoring.

BUT... if it's set improperly (too loud or too low) it could lead you to making mistakes when setting your recording volumes.

---

The difference here is that it replays your headphones volume using metadata but you can adjust it afterwards.
 
lumiere said:
Changing your ISO is like changing your monitor (headphone) volume when you record audio. It does nothing to what is recorded, it's just monitoring.

BUT... if it's set improperly (too loud or too low) it could lead you to making mistakes when setting your recording volumes.

---

The difference here is that it replays your headphones volume using metadata but you can adjust it afterwards.
Click to expand...


That's a good description, IMHO.
 
Think of it like you only have ONE FILM STOCK in the mag, Mysterium stock...regardless of ISO settings on the camera.

Flipping the ISO doesn't magically change the mysterium chip over for a NASA probe infrared chip or a night vision camera. The iso setting is simply an 'on set' guide of what can be achieved later in post. Like having an instant rushes print on set thats been 'pull' or 'push' processed.

AND just like in the film world there's no substitute for correct exposure.

Jas
 
Thanks for the analogies; they're all good, but I think I got it since it became clear that it's just metadata.
 
mail4joeg said:
Again the confusion. I'd like to hear the answer to this question:

Is camera "ISO" JUST Metadata, or is it now affecting the Raw image as with the allusions to "curves" and "algorithms?"

The answer to that question could clear up a lot.
Click to expand...

It is a false question that cannot be fairly answered.

Yes, ISO setting is metadata, but you use the ISO setting in conjunction with your lightmeter to determine and set the F-stop of the lens.

ISO setting + lightmeter + F-stop change on lens = your images is changed.

It all goes hand in hand.
 
As I understand it, the lighting, filters, lens, aperture and shutter speed define the exposure. These are the physical parameters that define how much light is entering the camera. If I set these things, regardless of what I set my camera ISO too, I will have the identical RedCODE RAW file.

While shooting, the ISO setting defines the conversion curve from the linear RAW data to the log/gamma of the on-set monitors. When using a light meter, I dial the ISO setting into it in order to determine the correct exposure. Adjusting the ISO doesn't change the exposure though.

In post, the ISO is just a way to modify the intensity conversion curves of the image - and possibly the debayer process, if there's some additional magic to be had there.
 
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