EX3's Black Balance, and the IR contamination problem

[Piotr Wozniacki]

Originally Posted by Adam Reuter

The EX1 does have black balance. I believe it's in the maintenance menu.

Yes it it there, but isn't active (grayed out) - at least with the 1.02 fw I still have.

[Ryan Avery]

Originally Posted by Robert St-Onge

Ryan, will the IR 750 filter be available in circular threaded: 77mm, 52mm and other diameters?
If so, when can we expect to purchase them?

Robert,

We can make almost any common filter size of the True-Cut IR 750. We have a few 77mm sizes in-stock and will likely make those a regular limited stock item. The other sizes will be special order with an average 3 to 4 weeks lead time. You may contact your favorite dvinfo.net sponsor dealer, tell them the filter and size you want, and we will work together to get you a price.

Ryan Avery
Schneider Optics

[Leonard Levy]

Ned, have you tested the IR750 under tungstun?

[Dominik Seibold]

Originally Posted by Alex Raskin

Is infrared light polarized?

Polarization isn't a property of special wavelengths. Most surfaces reflect diffuse, so they destroy any polarization, if there was any. Transparent stuff like glass is reflecting purely linear-polarized, if the light hits it with the brewster-angle of incidence.

[Alex Raskin]

Dominik, then do I understand correctly that Polarizers block light more or less evenly throughout both visible and IR spectrum, and therefore do not work as IR blockers?

[Ned Soltz]

Originally Posted by Leonard Levy

Ned, have you tested the IR750 under tungstun?

Not yet.

High priority this week is IR750 testing.

Ned

[Dominik Seibold]

Originally Posted by Alex Raskin

Dominik, then do I understand correctly that Polarizers block light more or less evenly throughout both visible and IR spectrum, and therefore do not work as IR blockers?

That's correct.

[Ryan Avery]

Originally Posted by Dominik Seibold

That's correct.

Ditto that.

Ryan Avery
Schneider Optics

[Lance Librandi]

Hi,
FYI I have a new EX3 with firmware 1.04-0084 and yes the IR problem is still there Sony really sucks on this one.
I have tried black balance, white balance and black balance again and it has not fixed the problem. I have just ordered a Tiffen 4 x 4 IR (IR680) due in 3 weeks to try to fix the problem. Most of my work is under QI lights. I had to do a interview yesterday and decided to not to use the Blonds and Redhead instead I use some new high intensity 2300K LED lights for the shoot. The images were great no IR contamination black were solid and crisp.
That’s great for close up work my problem is I do a lot of stage and musical productions that I have no control over lighting.
I would also be very interested in any tests using IR filters if some can post results.

Thanks
.

[Piotr Wozniacki]

Please report how your 680 is doing, preferably post some grabs!

TIA,

Piotr

[Dano Motley]

my ir problem dissapeared when i used the b&w 486 filter.

Dano

[Brooks Graham]

Originally Posted by Dano Motley

my ir problem dissapeared when i used the b&w 486 filter.

Dano

Same here.

Also, the amount of IR which is allowed to hit the sensors is determined by a fixed hi-pass filter which is permanently attached to the CMOS sensor assembly inside the camera. I wouldn't have expected a firmware update to alter that. Many CMOS-based cameras exhibit this behavior. If you want to see an extreme example, Google "Leica M8 IR contamination" - it will make you feel better about your EX1/EX3. (If "Sony sucks on this" then so does RED, Canon, ...)

I frequently shoot under hot lights and the 486 filter lets me control how far down the spectrum to go.

[Anthony McErlean]

Originally Posted by Dano Motley

my ir problem dissapeared when i used the b&w 486 filter.

Dano

Same here as well.