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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 :)

Are IR ND's necessary with Monstro?

steve green

steve green

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All,
Wondering if the "green tint" I'm seeing in my "out of the camera footage" is from using old school Tiffen ND's. I was under the impression that the new sensors were not effected by IR contamination like the older ones. Am I wrong?
Happy holidays to all!
 
I thought IR contamination was typically red/magenta?

Anyway, it could just be that the old Tiffen NDs you're using have a cast to them (or if they're not glass, have aged poorly). Is it only with higher strength NDs? Is it equal across the image or more in the blacks?

And yes, I was under the impression that Dragon and newer sensors had IR contamination help in the sensor stack.
 
Lots of Tiffen NDs are sickly green. Particularly older ones from when they were the only game in town.

Just shoot a chart indoors with and without, that should tell you whats up. But ND are often far from neutral.

Nick
 
I haven't used Monstro, but I know that on Dragon, the less light that hits the sensor, the more green the image will be.

I noticed that while doing ISO tests and stopping down the aperture, without using ND.
So try that on Monstro, without ND and see if the amount of green introduced is the same as with ND, at the equivalent stops of light loss.
 
Mike P. said:
I thought IR contamination was typically red/magenta?

Anyway, it could just be that the old Tiffen NDs you're using have a cast to them (or if they're not glass, have aged poorly). Is it only with higher strength NDs? Is it equal across the image or more in the blacks?

And yes, I was under the impression that Dragon and newer sensors had IR contamination help in the sensor stack.
Click to expand...

Definitely not the age. They are all glass and the 1.5 and 1.8 I've bought recently. The situation seems to be ND .6 and higher.
 
steve green said:
Definitely not the age. They are all glass and the 1.5 and 1.8 I've bought recently. The situation seems to be ND .6 and higher.
Click to expand...

I mean almost all ND's above .6 start to act weird.

At this point I'd only invest in the premium NDs - ie Firecrest, and I believe Schneider has a new product out?

Also the KipperTie solution looks pretty solid.

Our OG Motion Mounts are fantastic (no color cast of any kind), but not sure if those even work on Monstro.
 
I have a Tiffen IRND 1.5 and it’s pretty green when compared to the Nisi IRNDs I have-I always put the hue an extra -5 just with that glass. As a whole IR contamination is a bit less to worry about with the newer sensors but definitely still something to look out for when your NDs are above .6.
I remember a while back Shane Hurlbut did a test with the different OLPFs and surprisingly the standard olpf cut a lot of the IR, compared to the low light and skin tone highlight; and that was with the dragon sensor.
 
Chris Kennedy said:
I have a Tiffen IRND 1.5 and it’s pretty green when compared to the Nisi IRNDs I have-I always put the hue an extra -5 just with that glass. As a whole IR contamination is a bit less to worry about with the newer sensors but definitely still something to look out for when your NDs are above .6.
I remember a while back Shane Hurlbut did a test with the different OLPFs and surprisingly the standard olpf cut a lot of the IR, compared to the low light and skin tone highlight; and that was with the dragon sensor.
Click to expand...

I like the idea of just going -5 on the tint in lieu of doing a white balance. Stopping to do that, especially with two or more cameras is a pain sometimes.
 
steve green said:
I like the idea of just going -5 on the tint in lieu of doing a white balance. Stopping to do that, especially with two or more cameras is a pain sometimes.
Click to expand...

Yeah but a metadata adjustment doesn't change the fact that the ND is green, it's just helping you monitor with it taken out...but it's *still there*.

That green, especially if it's pretty bad, can have an affect on your entire image (think skin tones).
 
Nick Morrison said:
Yeah but a metadata adjustment doesn't change the fact that the ND is green, it's just helping you monitor with it taken out...but it's *still there*.

That green, especially if it's pretty bad, can have an affect on your entire image (think skin tones).
Click to expand...

Nick, understood regarding just a metadata change. The green tint I'm seeing is very easily corrected by our DIT while doing quick dailies transcodes. It just would be nice to not have the out of camera footage looking green.
 
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