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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 :)

80B Filter ..... anyone use these?

Dave Weber

Dave Weber

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Hey RED Brothers and Sisters.

I've had a question about using an 80B Filter with RED and don't know the pluses or minuses about them.

Any help would be greatly appreciated.
 
Internet info shows:

80A increases the color temperature from 3200K to 5500K for the use with 3200K lamps.

80B increases the color temperature from 3400K to 5500K for the use of photoflood lamps.

80C increases the color temperature from 3800K to 5500K.

80D increases the color temperature from 4100K to 5500K.

Basically, the lighter the strength, the less light loss there is from the filter.

For converting 3200K lighting for the RED, which is around a native 5000K, the 80B filter is probably correct, though any degree of conversion to shift the image towards daylight would help and the lighter 80C and 80D filter may be more practical than the 80A and 80B.

The primary "minus" of the 80A and 80B filters is the 2-stop light loss, essentially turning your 320 ASA camera into a 80 ASA camera.

Though I'm not positive, I can guess that the 80C has around a 1-stop loss and the 80D has a 1/2-stop loss.
 
80D for me. Seems like 2/3 stop loss (making the camera a 200 ASA camera) so not too awful for those tungsten interiors.
It seems to get me most of the way to 5000K (camera's native CT) with good quality tungsten units (Mole, Arri, etc.) By the book, the numbers would indicate that you'd be pretty warm still: from 3200K to 5000K is 112 Mired, or 3/4 CTB on the lights. An 80D is only 56 Mired, or halfway, but it seems closer to eye. Maybe I just like a little warmth.
It's also a tradeoff between a satisfactory image and a workable f-stop. Remember, you can do a LITTLE color balance correction later. It's the full-on tungsten-to-daylight correction that really ups the blue channel noise. And you can always put a little 1/8 CTB on the lights and use BBAs (or other blue bulbs) in the practicals to make up the difference... although in a night interior, I like a little warmth to the practicals generally (that is story/ location specific, of course)
I have an 80D in 6x6 and 4x5. They sit in my Red accessory case. I don't keep them with the other filter kits because this is the only day-to-day application for these filters. Just part of the Red Kit.
Cheers,
Harry
 
I'm still having issues with noise in black wardrobe when shooting tungsten, greenscreen, camera rated between 160 and 250, various projects. I bought an 80C but haven't had a chance to test and compare it yet.

Weber do want to shoot some tests with me? I'll pull some favors, get a stage, then we'll push though the post pipeline with Kip.
 
I did a few tests and found that under 3200K light with an 80C there was similar noise at 500ASA than no filter at 320ASA. It's use varies somewhat with subject, but an 80C is a good addition to your kit. No brainer to use it in 3200k if you have sufficient stop and want a neutral look ( as opposed to warm )

Matt Uhry
www.mattuhry.com
 
I have an 80C which corrects 3200 to about 4900. The RED sensor is 5000 so that is pretty darn close.

I will likely get an 80D as well. The lighter stop loss is more usable and the reality is, you don't need to perfectly balance to 5000 to get a clean image...as the wise lads here have mentioned.
 
Anyone know of a good place to get these filters in a 4"x5.65" size?
 
Try B.J. at Custom Supply.
 
Or Stan Wallace at the Filter Gallery in New York.
Cheers,
Harry
 
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