The Tiffen 3x3" Decamired Blue 12 Glass Filter- For those who want a sure-fire way of getting accurate color temperature readings, the decamired system is the way to go. 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.

Applications include keeping color temperature constant during the course of the day and producing the effect of different times of day. Available in two series, reddish filters that warm the light and bluish filters that cool the light. Each series contains 4 densities: 1.5, 3, 6, and 12. Filters in the same series can be combined.

Decamired filters are designed to more easily handle unusual color temperature variations than the previously mentioned filters. Available in increments of both a red and a blue series, Decamired filters can be readily combined to create almost any required correction. In measuring the color temperature of the light source, and comparing it to that for which the film was designed, we can predict the required filtration fairly well.

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 Temperature Control    Available in Specific Increments    Warming and Cooling Variety

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 tailors the light to the film

Related Questions and Answers

Q: 1. Do these require the Dedolight adapter, or can they be simply inserted directly behind the barndoors of the Aputure LS-mini20d, which has two slots for 3x3" gels? I guess the answer would depend on how sturdy these are (which would depend on the thickness of these filters and on the material they are made of). But I do not see that information listed in the description. And the specs only have the dimensions of the box, which is useless information for deciding whether to buy this product.

A: When using these filters with select Dedolight heads, a filter holder is required. However, if the intent is to use it with the filter slots on the Aputure LS-Mini 20D fixtures, then a holder is not required.

Q: 2. Is the aluminum-alloy frame magnetic so that it can be used with the Xume filter adapter system? Thank you.

A: Aluminum is not magnetic.

Q: 3. Can I still easily hood on/off the lens 24-105 G and/or 100-400 GM that has this filter on ?

A: This filter screws into your front filter threads and is not significantly wider than the front of your lens. Depending on what type of hood you have, you can screw it into the front filter threads on this filter or on the bayonet mount on the end of the lens with no issues.

Q: 4. Does it come with a hook to attach a lanyard?

A: Yes it does.

Q: 5. Hi, the graduated nd included in the set, which graduation is ? 0.3, 0.6 or 0.9 ? In order to know which ones I shuold buy separately. ThanksMariano

A: The graduated neutral density filter included in the Cavision Set of 4x4 Glass Filters kit would be a 2-stop 0.6 Grad ND Filter.

Q: 6. 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: 7. 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: 8. Hi does this set come with a filter pouch?

A: Yes, the Cavision set of 4x4 Glass Filters comes with a filter pouch.

Q: 9. 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: 10. Can this be used for Digital Video Cameras?

A: The Tiffen 82mm Water White Glass NATural IRND 0.3 Filter (1-Stop) can be used on a Digital Video Camera that has a lens with 82mm filter threads.