The Tiffen 5x5" 85C Color Conversion Filterhelps to decrease the color temperature from 5500 to 3800K, allowing the use of tungsten-balanced film in daylight conditions. 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 5 x 5" / 127 x 127mm.

Warming Color Conversion Filter    5500 to 3800K Color Temp Decrease    ColorCore Technology

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

Converts 5500 to 3800K for using tungsten-balanced film in daylight conditions.

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

Related Questions and Answers

Q: 1. 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

Q: 2. Hi with this filter can i put my rolleiflex lens hood on top? Thanks

A: Yes. It has a Bay 1 front so you can attach the hood.

Q: 3. What's the difference between this item and B&H#LE204R1? Are they the same item?

A: Both filter rolls have the same correction in mind, but B&H # LE204R1 comes on a smaller 1" core.

Q: 4. Will it fit Nikon 3300.?

A: This filter will fit any lens with 37mm threads

Q: 5. I have seen in the description that it converts Tungsten to Daylight. Can they do the reverse?because I have a Daylight LED that I want to turn to tungsten. Or do I have to buy a different pack?

A: This filter kit includes CTO filters which will convert a daylight source to a tungsten balanced source. This can be any daylight source, LED or otherwise.

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. 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: 8. How do these hold up compared to brands like LEE or ROSCO?

A: These are all very similar gels that will hold up to heat.

Q: 9. How many sheets are included?

A: One sheet is included.

Q: 10. Can this be used with hot lights without it melting/deforming too quickly?

A: The Rosco # 3208 1/4 Blue CTB Color Conversion Gel Filter (20 x 24" Sheet) is heat resistant however keep in mind that any gel gets deformed after a full day of work, especially if placed close to the source.