The Tiffen 4x5" 85 Color Conversion Filterhelps 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. 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: 2. 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: 3. 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: 4. 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: 5. Is this a graduated ND filter? It looks like it from the picture.

A: No, Formatt Hitech 105mm Firecrest ND 1.8 Filter (6-Stop) BH #FOFNDP1.8105 is not a graduated ND filter.

Q: 6. Can this type of ND filter be used as stack up filter, 2-stop + 4-stop = 6-stop?

A: Yes you can , its always best not to stack filters

Q: 7. 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: 8. 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.

Q: 9. 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: 10. Does this filter fit the Benro master series?

A: I'm sorry, no. The Benro Holder takes 100mm wide filters. You would have to go with the Formatt 85mm filter holder or get the Formatt 13 stop filter, which comes in 100mm.