The Tiffen 4x5.65" 81B Light Balancing Filterhelps to decrease the color temperature by 300K in order to warm the image slightly in order to match the color quality of illumination. When using an 81B filter, you will be able to attain 3200K balance when the prevailing light source is 3500K. The warming effect of this filter requires a 0.3-stop increase in exposure for normal results.

This filter is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding flat to a tolerance of 1/10,000th of an inch. It measures 4 x 5.65" / 101.6 x 143.5mm.

Warming Light Balancing Filter    Less 300K to Convert 3500 to 3200K    ColorCore Technology

Light balancing filter decreases color temperature and provides a warming effect.

Subtracts 300K in order to attain 3200K color balance from 3500K illumination.

Filter factor of 1.3 requires a 0.3-stop increase in exposure.

Related Questions and Answers

Q: 1. Is this Matte Box compatible with 138mm round filters?

A: This matte box is not compatible with any round filters, unless they are in a 4x5.65 filter tray.

Q: 2. What step down ring should I get to fit my Tiffen VND 138mm filter at the back of this mattebox..

A: Sorry, wrong size, 138mm is just the the size of the filters inside. Should say 143mm which is the size of the housing it need to be hold tight and fit in. And also may I know the rear opening size of this Tilta mb-t04 mattebox.. Thank u in advance..

Q: 3. Will this clamp onto Cooke Panchro iClassic primes?

A: For the ARRI Mini Matte Box MMB-2 114 Clamp-On Set to clamp onto the Cooke Panchro/i Classics, you need this clamp set. ARRI MMB-2 Reduction/Clamp-On Ring Set Cine Pro

Q: 4. Is it really 9.5 lbs? I am a little worried about the weight.

A: It is a heavy matte box, it is about a 1.5kg (3.3lbs) without the flags and hard mattes, and 15mm rod adapter. In my case I have a F55 and an Alexa so it is not over kill. The box it came in was about 12lbs. Great build.

Q: 5. In the spec, it says that the shipping weight is about 9lbs, but other search on the internet says that the item weight is only about 3-4 lbs and it is the shipping weight that is 9lbs. So I just want to make sure, with the flags and everything, will this weigh 9lbs?

A: The matte box weighs between 3 and 4 lbs depending on how it is set up. The 9 pound weight is the box with everything that is included in it.

Q: 6. Is this the product with two 4x5 filter holders? Does it come with the fabric donut attachment?

A: 1 4x4 and 1 4x5.6No fabric donut

Q: 7. How many stops does this go up to?

A: The Tiffen Multi Rota Tray Variable Neutral Density Kit goes from 2 to 8 stops.

Q: 8. Im thinking about getting the 4x4 and 77mm screw on in this. Is the Black Frost 1/4 Filter the same as Black Frost 1/4 White Water Glass Filter? What's the White water bit?

A: It is same diffusion. However, Water White is the best, clearest no-color-glass Tiffen makes.

Q: 9. what range of stops of light does it cut?

A: The Tiffen Multi Rota Tray Variable Neutral Density Kit with Extra 4x5.65" Circular Polarizer offers 2-6 stops.

Q: 10. How thick is this Schneider 4x4 filter? Will it fit in a Lee Filters 100mm foundation kit if I install the 4mm optional spacers? Thanks!

A: This filter is 4mm thick.