The Tiffen 4 x 4" 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 4" / 101.6 x 101.6mm.

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. Safe for solar eclipse photography?

A: This filter would not be safe for shooting a solar eclipse. The Formatt Hitech Firecrest 100mm Holder Kit with 5.4 (18 Stop) Eclipse Filter B&H # FOFCHKE54100 is a suitable filter.

Q: 2. Where is this filter made?

A: According to our records, the Formatt Hitech 77mm Firecrest ND 1.8 Filter (6-Stop) is made in the UK. Please note that this is subject to change at any time.

Q: 3. 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: 4. Is this nd high enough quality to use with a sony 24mm 1.4 gm or get a tiffen? And is the 6 stop nd a going to let me shoot video at 1.4 in the day time or do i need a high stop nd?

A: The Formatt Hitech 67mm Firecrest ND 1.8 Filter is high enough quality to use with a Sony 24mm 1.4 GM lens, using Schott glass with 15 layers of coating. When shooting video, with the camera set on the lowest ISO possible, set at a 60 fps, this 6 stop ND filter could work at f1.4.

Q: 5. Will this protect the sensor of a D7000 when taking sunrise, and sun pictures? Will use Live View and not optical for viewing.

A: You will want a 18 stop Solar filter https://bhpho.to/2MFxXFU.

Q: 6. The photo looks like it is a graduated filter. Is this is a straight filter?

A: Image is misleading. It is not a graduated filter. It is a solid variable density filter.

Q: 7. 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: 8. I'm new to square filter systems. Being 85mm is this compatible with the Cokin P holder?

A: Yes, the Formatt Hitech 85 x 85mm Firecrest ND 4.8 Filter would be compatible for use with the Cokin P-series filter holder.

Q: 9. Does this filter have threads on the front ring so that you can add another filter?

A: Yes.

Q: 10. What are the rings made of?

A: I would say light weight metal. Not 100% sure. Very nice filters. I have 6 of them.