The Tiffen 138mm Decamired Blue 12 Cooling Filterfrom Tiffen is for those who want a sure-fire way of getting accurate color temperature readings. Using this formula, you can transpose temperatures from one point to another easily and quickly. This system is also useful when you wish to bring a certain amount of creativity to color photography.

Decamired filters are used to maintain consistent color temperature during the day's shooting. Decamired filters are available in two series - reddish filters that warm the light and bluish filters that cool the light with each series available in four densities: 1.5, 3, 6, and 12. When filters from the same series are used, they can be combined.

Decamired filters can be readily combined to create almost any required color correction. In measuring the color temperature of the light source, and comparing it to that for which the film was designed, required filtration can be easily calculated.

A filter that produces a color temperature change of 100K at 3400K will produce a change of 1000K at 10,000K. This is because the filter relates to a visual scale of color. It will always produce the same visible difference. A color change of 100K at the higher temperature would hardly be noticed.

Calculations
To use this concept, subtract the mired value of the light source from that of the film. If the answer is positive, you need a reddish filter; if negative, use a bluish filter. Mired-coordinated filters are termed as decamireds. Mired value divided by ten yields decamireds. The 60 mired shifts, above, would be produced by an R6 filter, where the higher values were that of the lighting.

Sets of such filters generally come in values of 1.5, 3, 6, and 12 decamireds in both B (bluish) and R (reddish) colors. These numbers are additive; that is, a pair of R3's produces an R6. An R6 plus a B6 cancel each other out to produce a neutral gray.

Used for Accurate Temperature Control    Filters Can Be Combined to Control Color    Made in Specific Increments    Available in Warming and Cooling Variety    ColorCore Glass    Made in the USA    10-Year Warranty

The decamired system has an advantage over the Kelvin system in that the Kelvin scale is not linear

Decamired readings provide more accurate/controllable readings than Kelvin

The difference between the Mired value of the film and the Mired value of the light is the Mired value of the correction filter that correctly balances the light to the film

Related Questions and Answers

Q: 1. Are these compatible with GoPro 12?

A: Yes, the Tiffen 3-Filter ND Kit for GoPro HERO9/10/11 Black is compatible with the GoPro HERO12 Black.

Q: 2. Are these compatible with a protective housing for Gopro 11?

A: No, the Tiffen 3-Filter ND Kit for GoPro HERO9/10/11/12 Black can not be mounted to the GoPro Hero 11 and then still fit inside the GoPro Protective Housing with the filter attached.

Q: 3. Is it compatible with Go Pro 12 also?

A: Yes. The Tiffen 3-Filter ND Kit for GoPro HERO9/10/11 Black is compatible with the Gopro Hero 12.

Q: 4. Is the Tiffen multi rota tray able to hold a 138mm diopter?

A: Sorry, but since the filter is permanently mounted, you cannot substitute a 138mm diopter.

Q: 5. Will these fit the GoPro Hero 11?

A: Yes, the Tiffen 3-Filter ND Kit for GoPro HERO9/10 Black is compatible with the GoPro HERO11 Black.

Q: 6. Will this work with the Redrock Micromatte box?

A: While this combination has not been tested it is our opinion that yes, it slip right into the mattebox. Tiffen and Redrock make pro gear and since the tray is made to the Arriflex standard, it is unlikely it would not work.

Q: 7. Can we use this with a MWIR camera? This would require the use of an alternative window such as saphire. Can the window be changed out?

A: The short answer is yes . Dotworkz offers some options on the front window on their web site. However, these are limited by the window shape. So, if your supplier of optics will not make a custom shape to fit the window frame you will need to fabricate a custom frame to fit your optics.

Q: 8. Can I stack this filter with the Go Pro Max Lens?

A: No, the Tiffen 3-Filter ND Kit for GoPro HERO9/10/11/12 Black would not be compatible with the GoPro Max Lens Mod.

Q: 9. Does it fit with the media mod?

A: No, the Tiffen 3-Filter ND Kit for GoPro HERO9/10/11/12 Black does not fit with the GoPro Media Mod for HERO9/HERO10/HERO11/HERO12 Black, B&H # GOMMH9B.

Q: 10. Can i use this product with Tilta 4*5.65 carbon fiber matte-box ?

A: This is not compatible with that matte box. This is a circular 138mm filter; the Tilta matte box is designed for rectangular filters 4 x 5.65".