The Tiffen 6x6" Cool Blue Soft-Edge Filterhelps to specifically add a cool, purplish-blue coloration to skies and other bright areas of an image while allowing a portion of the image to remain neutrally colored. The filter's coloring is densest at the edge and tapers to clear by the middle, with a soft-edged transition between the density and clear areas. The 4 color density provides less cool blue coloration than the 5 density, but more than the 3 density filter.

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 6 x 6" / 152.4 x 152.4mm.

4 Density Color Graduated Filter    Cool Blue Coloring in Select Areas    Soft-Step Graduation    ColorCore Technology

Provides a deep cool blue coloring to select areas of the image.

Graduated filter design keeps a portion of the image neutral, resulting in a more realistic look while allowing for the sky or other bright areas to take on the color of the density.

Related Questions and Answers

Q: 1. What is this filter made of? CR-39?

A: Hitech brand filters are made of CR-39 resin. CR-39, or allyl diglycol carbonate (ADC), is a plastic polymer commonly used in the manufacture of eyeglass lenses. The abbreviation stands for Columbia Resin #39, because it was the 39th formula of a thermosetting plastic developed by the Columbia Resins project in 1940. It is a common filter material for square and rectangular filters that are used in holders such as the Cokin and Lee holders.

Q: 2. Is there a glass one of these?

A: Per reply from Lee Filters today, all of their graduated filters are manufactured in resin only.

Q: 3. Do the Cokin filters fit the 85mm Aluminum Modular Filter Holder by Formatt Hitech, I just want to make sure since B&H states the filters for this set fit the Cokin P series holder. Thanks

A: Yes, the 85mm Cokin filters fit in the 85mm Aluminum Modular Filter Holder by Formatt Hitech.

Q: 4. Where is the origin? What is thick?

A: According to the information we have, our current inventory's Country of Origin is UK. Please be aware this can change over the product's production life without notice. LEE Filters are typically 2mm thick.

Q: 5. I have heard many good things about 100mm formatt filters. Does the quality of those 85mm resin filters is the same of other Formatt filters?I plan to use them in top of my 77mm B+W circular ND filters, by using a cheap Cokin P holder. To be used on Fuji X-T1.Thanks

A: I think it's a good filter and a good buy. It is quite a bit cheaper than many other brands, but it is much more scratch resistant than the very inexpensive ones.

Q: 6. It's not 4 x 4 or 4 x 5.65, so what mattebox?

A: The NiSi 100x150mm Nano Soft-Edge Graduated IRND 0.9 Filter (3-Stop) is not made for a mattebox but instead intended for use in a filter holder such as this: https://bhpho.to/3vrn0ML

Q: 7. Can there filters be used in a Lee 100 filter holder?

A: Yes they can.

Q: 8. Is there a P Series Kit where the Filter Holder is not included? I already have one of those.

A: Yes, here are a few suggestions on cokin filter kits that are available without the filter holder. Cokin P Series 0.3, 0.6, and 0.9 ND Filter Kit (1, 2, 3-Stop) https://bhpho.to/3f6gp3o Cokin NUANCES Extreme P Series Smart Kit https://bhpho.to/3yckOsX Cokin P Series Hard-Edge Graduated Neutral Density Filter Kit https://bhpho.to/2VdTT1m Cokin NUANCES Extreme P Series Soft-Edge Reverse-Graduated Neutral Density Filter Kit https://bhpho.to/3ia71h3 Cokin P Series Hard-Edge Graduated Neutral Density Filter Kit https://bhpho.to/3xahYmU

Q: 9. I have the 100 -400 canon lens. what exactly do I need to use this setup? Please be specific. Thank you

A: Hi Patricia,As far as I could research, there are two Canon lenses that fit your description. One has image stabilization (IS) while the other does not. The Canon EF 100mm f/2.8 Macro USM has a filter diameter of 58mm and would require this: https://a href= http://www.bhphotovideo.com/c/product/14092-REG/Cokin_CP458_P_Series_58mm_Adapter.html target= _blank www.bhphotovideo.com/c/product/14092-REG/Cokin_CP458_P_Series_58mm_Adapter.html/aThe Canon EF 100mm f/2.8L Macro IS USM has a filter diameter of 67mm and would require this: https://a href= http://www.bhphotovideo.com/c/product/14094-REG/Cokin_CP467_P_Series_67mm_Adapter.html target= _blank www.bhphotovideo.com/c/product/14094-REG/Cokin_CP467_P_Series_67mm_Adapter.html/aIf neither of these match the lens you own, then the item you are looking for is a Cokin P Series Filter Holder Adapter Ring in the appropriate size. The kit already includes the filter holder, which simply slides onto the adapter ring. These are nice filters, I've enjoyed them very much so far. Best of luck!

Q: 10. Would this fit into a 4x4 matte box? 100mm x 100mm?

A: No, this filter is 85 x 110mm. You would instead want to look at these properly sized options: https://bhpho.to/2qCmfgH