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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 :)

Weapon in Low Light

Mark Andersen

Mark Andersen

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I did some shooting with the Weapon CF yesterday at ISO 1600 and wow, no noise! Here's a sample still.

Leica R 35mm Summilux at 1.4, ISO 1600, LLO OLPF. Did I mention I love this camera?
 
Great shot Mark!

I too have had great results at ISO1600 with my new Weapon camera, and I was using the SKIN TONE OLPF.
 
I was talking to a colourist the other day who just worked on set and in post on an HDR shoot. He mentioned that for HDR (using a Dragon, not the Weapon) they shot at 150 and 500 ISO only - anything above that was noisy in HDR. I was pretty surprised to hear this - anyone have any thoughts on this? Or other experiences?
 
No much experience with HDR, but my limited time trying to use frame summing for long exposures was the same both on weapon and dragon. From my tests anything above 250iso seems to be super noisy. Wonder if it has something to do with the camera processing multiple frames in general?

For or hdr might be some kind of black shade thing. If camera is taking 2 exposures and blending them one might be not tuned into current black shade which would cause more noise, therefore requiring lower Iso.

One thing is for sure if that's true, might be best just to ditch HDR entirely and shoot at lowest compression ratio possible with ideal iso and blackshade cal. My experience shooting HDR time lapses on dslr eventually just lead me back to shooting straight raw files to make it look more HDR in post if I choose to.
 
ian henry said:
I was talking to a colourist the other day who just worked on set and in post on an HDR shoot. He mentioned that for HDR (using a Dragon, not the Weapon) they shot at 150 and 500 ISO only - anything above that was noisy in HDR. I was pretty surprised to hear this - anyone have any thoughts on this? Or other experiences?
Click to expand...

Shooting lower than 320 iso in RGamma4 with Epic Dragon isn't useful as you only lower the clipping level from 98% to 70%. And I don't see any 150 iso setting... 125 or 160...? I think there are some false infos somewhere. But noise introduced by HDRx depends on how you underexpose the X track. For example 5 stops goes from 320 iso to 10'000 iso.

Pat
 
I am no expert on this. But considering that the ISO is not "baked" in the RED files, I would assume that if you shoot in the 320-500 range, it gives you enough latitude in post to push 2 stops on each side.
 
Alberto Guglielmi said:
I am no expert on this. But considering that the ISO is not "baked" in the RED files, I would assume that if you shoot in the 320-500 range, it gives you enough latitude in post to push 2 stops on each side.
Click to expand...

Exposing for 320 instead of 1200 gives you 2 stop less highlight protection. Iso is not only metadata as it has a direct impact on how you see and expose your footage and changes your exposure decisions.
 
Patrick Tresch said:
Shooting lower than 320 iso in RGamma4 with Epic Dragon isn't useful as you only lower the clipping level from 98% to 70%. And I don't see any 150 iso setting... 125 or 160...? I think there are some false infos somewhere. But noise introduced by HDRx depends on how you underexpose the X track. For example 5 stops goes from 320 iso to 10'000 iso.

Pat
Click to expand...

ISO and HDR has nothing to do with each other. It's exposure time (shutter) differences between the tracks that make up the HDR image, thereby creating the "sharp edge ghost" effect. The ISO has it's base around ISO320 or ISO400, so if you shoot and expose for ISO800, you could in theory get back highlights by splitting the file into an ISO320 and a ISO800 setup. But you could never do it at ISO320 by going lower to ISO50, that would just look like a clipped images being darkened.
 
Hey guys, a quick question about the weapon. Does the weapon exhibit the same red dot pattern as the epic dragon with the low light olpf when flaring ? Also does it exhibit the ghosting effect which I mainly get when working with candle light ?

Cheers
Ian
 
ian henry said:
I was talking to a colourist the other day who just worked on set and in post on an HDR shoot. He mentioned that for HDR (using a Dragon, not the Weapon) they shot at 150 and 500 ISO only - anything above that was noisy in HDR. I was pretty surprised to hear this - anyone have any thoughts on this? Or other experiences?
Click to expand...


I think you guys are talking about two different things Ian Henry talks a bout a HDR project / something shot and graded to be shown on HDR screens. That has very little to do with HDRx shooting.

Simply when doing grading for HDR screens you want coverage in the darks, or simply, little or no "noise floor pixels". One way to get there is to to talk about and use low iso. The other way is to make sure to have a fat histogram and no left side goal post.

Then for the other discussion about HDRx. I find the common mistake to be when shooting HDRx (which I think Ian was not referring to) is that people tend to look at the A track and not over expose it, Then all you got is one track with highlight cover and then a underexposed X track. Better practice is to look at the X track and set it a stop below the stoplights and then decide how many stops above that you need to set the A track to have coverage in the blacks.

So for HDRx the important not is to remember the A track is for the lowlight and the X for highlight protection a lot of times I have seen these two being mixed up so there is only exposure for the highlights and the lowlights got lost.
 
Ian D said:
Hey guys, a quick question about the weapon. Does the weapon exhibit the same red dot pattern as the epic dragon with the low light olpf when flaring ? Also does it exhibit the ghosting effect which I mainly get when working with candle light ?

Cheers
Ian
Click to expand...

No on both accounts. These issues were specifically addressed.
 
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