The Tiffen 4 x 4" 85C Color Conversion Filter helps 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 4 x 4" / 101.6 x 101.6mm.

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. 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: 2. Will this fit a standard Canon lens, (any size)? Doesn't look like it. I have a blue lens with a 37mm lens diameter and don't know how to fit it on my lenses???

A: Tiffen 37mm 0.65x Wide-Angle Conversion Lens BH #TI.65WACL wouldn't fit on any of the standard size Canon interchangeable lens. Depending on what lens you have, you might have to use a step down adapter.

Q: 3. Will it fit Nikon 3300.?

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

Q: 4. 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.

Q: 5. Good days. I want to know if I can pay with french credit card, I am French, to send my order(request) to a person in Orlando?

A: Please contact B&H directly for assistance

Q: 6. 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: 7. How many stops of light does it take?

A: The following system offers 10-stops of light loss.

Q: 8. Will this gel melt if I put it on an Arri 1k open face?

A: It depends on how close to the light you have it. These gels are pretty durable and withstand quite a bit of heat but can melt if left near the heat source to long. I don't use your type of lights but I have taped these directly to the front of my dynalite strobes with nothing in between. They get pretty hot and the gels stand up to it perfectly fine as long as you don't just leave them sit there with the lights on for long periods. I usually adjust my lighting then put the gel on and shoot so the gel isn't on for too long. If you use a holder and put a little space between the light and the gel this should definitely work but if you are taping it directly to the light like I do then keep an eye on them because they can melt if left too long with the lights on.

Q: 9. How many stops of light does it take?

A: The following system offers 6 2/3-stops of light loss.

Q: 10. Does it have male/female threads? Whats the size of the threads? Whats the size of the outer barrel? can i clamp a 114mm clamp on matte box on it?

A: According to Tiffen, they state that the 4.5” filters are not threaded and has no internal/external threads, as they are a drop-in style filter made for adapters. As such, the listed 4.5" size reflects the total size of the filter (the outer diameter) which would fit into a 4.5” holder.