Eirik Tyrihjel
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- Dec 28, 2006
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- Oslo, Norway
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I had my RED #476 out on a music video shoot today in an incredibly nice hot sun, and the cinematographer wanted to shoot with the lens quite open at 2.8, and inserted an ND .9 (Formatt HD ND) and an ND 1.2 (Formatt HD ND) as well as an Schneider 1/2 soft FX filter. The lens was a Zeiss super speed T1.3 25mm.
The resulting image can be seen below (girl in grass).
At first they thought it was a problem with the camera or camera settings, so I was called to the set. Assuming it was a camera problem, I didn´t want to waste more time, and I started by reinstalling the firmware - problem persisted. I then went on and took off all the filter and stopped down the lens all the way to 22, and the colors were back (nice and bright - just like you expect them to be)
(The camera department said they had tried this before my arrival but that they still had the green color missing... whatever happened when I wasn´t there I can only speculate about, but it needs mentioning)
None of us had seen this phenomenon before, but we inserted the Schneider IR cut off filter and got some of our green back, but not enough, as can seen in the other sample photo attached.
The grass had a nice saturated green.
The photo with the girl on the grass, shows the footage with ND 1.2, ND .9, and 1/2 soft FX
The other photo shows a shot where the left half has ND 1.2, ND .9 and a Schneider IR cut off filter while on the right the IR cut off filter is removed, look at the grass/leaves - no color!
I would love to hear any feedback on this, have other people seen IR polute green grass so it looks grey? Or are there any other explanations for this other than IR pollution? Could it be that the filters or how they were stacked, when the filters were inspected by eye - they seemed fine, green color was there.
With a stack of ND 1.2 and ND .9 and an IR cut-off filter, the green is still not good enough (I would say a good colorist can fix it), but what more can one do than add an IR filter, do they come in different strengths? (would this problem be avoided with ND filters with built in IR filtering?)
I also need to add that we are located in Oslo, Norway, quite a bit to the north at about 60 degrees northern latitude, and we have about 18 hrs of sunshine at this time of year.
Camera build was build_17_v3.4.1
Thanks!
The resulting image can be seen below (girl in grass).
At first they thought it was a problem with the camera or camera settings, so I was called to the set. Assuming it was a camera problem, I didn´t want to waste more time, and I started by reinstalling the firmware - problem persisted. I then went on and took off all the filter and stopped down the lens all the way to 22, and the colors were back (nice and bright - just like you expect them to be)
(The camera department said they had tried this before my arrival but that they still had the green color missing... whatever happened when I wasn´t there I can only speculate about, but it needs mentioning)
None of us had seen this phenomenon before, but we inserted the Schneider IR cut off filter and got some of our green back, but not enough, as can seen in the other sample photo attached.
The grass had a nice saturated green.
The photo with the girl on the grass, shows the footage with ND 1.2, ND .9, and 1/2 soft FX
The other photo shows a shot where the left half has ND 1.2, ND .9 and a Schneider IR cut off filter while on the right the IR cut off filter is removed, look at the grass/leaves - no color!
I would love to hear any feedback on this, have other people seen IR polute green grass so it looks grey? Or are there any other explanations for this other than IR pollution? Could it be that the filters or how they were stacked, when the filters were inspected by eye - they seemed fine, green color was there.
With a stack of ND 1.2 and ND .9 and an IR cut-off filter, the green is still not good enough (I would say a good colorist can fix it), but what more can one do than add an IR filter, do they come in different strengths? (would this problem be avoided with ND filters with built in IR filtering?)
I also need to add that we are located in Oslo, Norway, quite a bit to the north at about 60 degrees northern latitude, and we have about 18 hrs of sunshine at this time of year.
Camera build was build_17_v3.4.1
Thanks!
