The Tiffen 3x4" 85B Color Conversion Filterhelps to decrease the color temperature from 5500 to 3200K, allowing the use of tungsten-balanced film in daylight conditions. The warming effect of this filter requires a 0.6-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 3 x 4" / 76.2 x 101.6mm.

Warming Color Conversion Filter    5500 to 3200K Color Temp Decrease    ColorCore Technology

Color conversion filter decreases color temperature and provides a warming effect.

Converts 5500 to 3200K for using tungsten-balanced film in daylight conditions.

Filter factor of 1.6 requires a 0.6-stop increase in exposure.

Related Questions and Answers

Q: 1. how many stops total compensation does this require? .9nd +the 85

A: It is a 3 stop filter. You would need 3 stops of compensation. The 3 stop rating on the filter factors in the 85B filtering properties.

Q: 2. Will this grid fit on a Westcott Rapid Strip Box 10 x 24?

A: Unfortunately, no, it would not. Instead, the Westcott 40° Eggcrate Grid for Rapid Box Strip 10x24" and Switch 1x2, B&H # WE2837, would be the correct option that would work for your usage needs.

Q: 3. Will the 12 x 36 grid fit on the Westcott Rapid Box Strip XL of the same size?

A: Yes, This grid will fit on the XL strip.

Q: 4. I want to convert 3200K to 5000K. Which strength do you recommend? And do you stock smaller sheets?

A: In order to do that you would need a 3/4 CTB and a 1/8CTB stacked. The 20x24 sheets are the smallest individual sheets we have.

Q: 5. How many sheets are included?

A: One sheet is included.

Q: 6. Is this the 'darkest/deep blue' version they have? Last blue gel I got (Lee 201 and 202) was far too 'white' for what i'm looking for. I want a deep blue

A: CTB is a correction gel it is not meant for adding color. If you want a rich blue color Primary Blue https://bhpho.to/31L7fky would be a good option.

Q: 7. What is the difference between this and the Heliopan KR3 81C (705516)?

A: 705516 is a mistake listed on our website. It is an 81EF filter, not 81C.

Q: 8. Will this melt if I put it next to my speed ring on an Arri 1k open face?

A: These gels are heat resistant but will eventually fade and distort. I've only seen them melt when in direct contact (or very near proximity) with a halogen lamp. I think you'll be ok for awhile if the gel is on the outside of a lensed speed ring. Maybe check for sure with Rosco or Lee.

Q: 9. Will this fit the Westcott Manny Ortiz 36" Switch Beauty Dish? There's image of the product. Thanks.

A: No. Please review the following item. Westcott 40° Eggcrate Grid for Rapid Box Octa XL and Switch Octa-M BH #WE2835 • MFR #2835 https://bhpho.to/3vKzPTS

Q: 10. How would this attach to a F&V Fighter 300 flash unit?

A: These can taped and wrapped to any configuration. I've even cut them to make filters for my PAR lights