Blending two distinct filter effects into one, the Tiffen 4.5" Warm Ultra Circular Polarizer Filterfrom Tiffen 4.5" Warm Ultra Circular Polarizer Filterhelps to reduce reflections and glare as well as provide an overall warming tone. The Ultra circular polarizer effect provides deep, saturated, and rich colors and efficiently cuts haze and reflections from non-metallic surfaces. Complementing these effects, the incorporation of a Warming 812 filter into the design adds a natural glow to skin tones and other subjects, making it ideally suited for use in outdoor open shade conditions where there is an excessive blue color cast.

This filter is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, and then mounting to precision metal rings. It measures 4.5" in diameter and is suitable for use in select matte boxes and sunshades.

Helps to Eliminate Reflections and Glare    Reduces Haze and Blue Cast in Landscapes    Greater Color and Tonal Saturation    Integrated Warming 812 Filter Effect    ColorCore Technology

Ultra circular polarizer significantly reduces reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface.

Lessens haze in distant landscapes and provides more saturated, vivid colors.

A circular polarizer differs from a linear polarizer in that it supports full use of a camera's autofocus and auto exposure functions.

Strongest effect when used at a 90° from the sun.

Warming 812 filter effect provides an overall warm tone to the image and is ideal for working in conditions with an overwhelming blue color cast.

Related Questions and Answers

Q: 1. Is it threaded to hold a 40.5mm ND filter like the standard tray in the 400 2.8?

A: No, the Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens is strictly for polarization and cannot have the filter changed.

Q: 2. Will this work with the Wooden Camera Zip Box Pro 4.5" Round Filter Stage?

A: Yes, the Lindsey Optics 4.5" Round Brilliant-Pol Linear Polarizer would work with the Wooden 4.5" round filter stage when using the Wooden Zip Box Pro. Wooden Camera Zip Box Pro 4.5" Round Filter Stage BH #WO271400

Q: 3. Does the circular polarizer for the FE400 also fit the FE600?

A: Yes, this filter and its holder will work in the FE 600mm and all Sony telephotos with drop-in filters.

Q: 4. How many stops of light do we lose by using this polarizer?

A: I contacted Sony concerning your inquiry. While they did not have an exact light loss listed for this Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens, they did state that circular polarizers typically block out half of light coming in, so typically light loss is 1-2 stops.

Q: 5. Is it compatible with Sony E mount lens 100-400mm

A: No, the 100-400mm does not use a rear drop in filter.

Q: 6. what storage/carrying pouch would you advise for this item, when it is not fitted to the lens?

A: The Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens can be stored a in filter pouch, like the Ruggard 4-Pocket Filter Pouch (Up to 86mm), B&H # RUFPB244B.

Q: 7. Does it come from the factory with mount compatible with Panasonic Lumix GH5?

A: This lens has a Micro 4/3 mount so it will fit directly on cameras such as the Panasonic GH5.

Q: 8. Does this come with a filter pouch?

A: Yes, an individual filter pouch is included in the box with Lindsey Optics 138mm Brilliant Rota-Pol Circular Polarizer for 4 x 5.65" Cine Matte Boxes.

Q: 9. Can the actual circular filter be removed and replaced with another filter ?

A: No, the filter in the Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens cannot be removed and replaced.

Q: 10. What size is this filter inside of the pouch?

A: The polarizing filter in the Lindsey Optics 138mm Brilliant Rota-Pol Circular Polarizer for 4 x 5.65" Cine Matte Boxes is 138mm diameter.