The Tiffen 4 x 5" 85 Color Conversion Filter helps to decrease the color temperature from 5500 to 3400K, 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 4 x 5" / 101.6 x 127mm.

Warming Color Conversion Filter    5500 to 3400K Color Temp Decrease    ColorCore Technology

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

Converts 5500 to 3400K 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. Does this filter fit Cokin P holder?

A: Unfortunately no. The Formatt Hitech 85 x 85mm Firecrest ND 0.9 Filter B&H # FOFCND.9CP MFR # FC85ND0.9, does not fit the Cokin P Holder.

Q: 2. Will this filter fit inside the Wine Country Camera 150 mm x 150 mm filter vault? I see the Formatt Hitech is 4 mm thick. I think the Wine Country Blackstone filters are 2mm thick but I can find no information to verify this.

A: The Wine Country filter holders have 2mm slots, so that filter is not compatible.

Q: 3. What is the difference between this lens filter & the Formatt Hitech Ultra version? [Formatt Hitech 77mm Firecrest Ultra ND 0.9 Filter (3-Stop)] Thanks.

A: The Ultra Firecrest series filters exhibit greater clarity and have lower reflectivity than the original Firecrest filters. Borrowing from the range of Firecrest cine filters, the Ultra series filters undergo a secondary lapping and polishing process after the initial polishing and bonding stage. This additional step helps to ensure flatness and consistency for improved image quality.

Q: 4. Any problem with vignetting with the 77mm diameter at wide angle like 16mm? I am thinking of using it for canon 16-35mm f4

A: You shouldnt see any vignettes from the filter at 16mm.

Q: 5. Does this filter block IR spectrum?

A: It "attenuates" or reduces IR interference during long exposures to prevent color casts. It does not fully block IR.

Q: 6. Will this filter be SLIM ENOUGH to slot into a Canon 300/2.8 and 400/2.8 lens? I have the drop-in filter holder that accommodates 52mm screw-in filters, but they need to be SLIM enough to fit into the drop-in slot on top of the 300 and 400 mm lenses. Will it work?

A: There is no published list of compatible filters for that filter holder--the only filters guaranteed to fit are those provided by Canon. Because the Formatt Hitech 52mm Firecrest ND 1.5 Filter (5-Stop) has a "super-slim" design, it may work.

Q: 7. Will it work on Zeiss 15mm f/2.8?

A: As long as your lens takes this size of filter. Not sure if your lens has a bulbous front or not. I have this filter on a 10-24 7mm thread no problem

Q: 8. Is this filter stackable with another circular filter?

A: It is with a filter of the same size or with a step up or down ring to the same size in this case 77mm.

Q: 9. Is this compatible with the Cokin P system holder?

A: The Formatt Hitech 85 x 110mm Firecrest Graduated ND 0.6 Filter (Vertical Orientation) are 2mm thick and the Cokin P brand holders use filters that are 1.6 mm thick. It will be very very tight to use those.

Q: 10. Does this come with pouch or case?

A: Its packaged in a case but the case itself i found too big to stuff in your bag.