The Tiffen 2 x 2" Decamired Blue 12 Cooling 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. Can i use it on BMPCC4K ?

A: Yes, the Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens (Micro Four Thirds) is compatible with the Blackmagic Design Pocket Cinema Camera 4K.

Q: 2. Does this lens work on an Olympus camera?

A: The Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens with Filter Kit (Micro Four Thirds) is cross-compatible with all Micro Four Thirds camera systems.

Q: 3. What comes with camera & lens ?Is Battery & charger included ?

A: I bought the camera body only. It came with one battery, a charger, strap, etc.

Q: 4. Are the RAW pictures still 12-bit? When is M43 going to get 14-bit RAW?

A: It appears that the DMC-G85 has 12-Bit Raw. I wouldnt be able to say if/when a micro four thirds camera might hit the market with 14-bit.

Q: 5. considering this or a 4k Camcorder for use as an unmanned video camera mounted high on a tripod for weddings and seminars- assuming using branded battery with full charge, can anyone estimate recording time - using auto settings before the battery runs down? Thank you.

A: I have not done what you are suggesting. Dedicated video cameras tend to be better for these types of applications because they can often run of AC power and they do not have tendency to overheat.

Q: 6. Is the zoom ring linear or does it accelerate when used with a GH6? I have a pair of Panasonic Leica lenses with sliding zooms.

A: The focus ring on the Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens is not linear. It uses a focus-by-wire system, where the speed of the focus adjustments depends on how quickly you turn the ring. So it's acceleration, the faster you turn the ring, the more the focus changes.

Q: 7. Can I control the ZOOm and FOCUS of this lens from my Atem Mini Ext. SDI using a BMD Studio Camera 4k Plus?

A: No, the Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens (Micro Four Thirds) does not have a servo zoom motor with which to zoom the lens. The lens you are looking for is the Panasonic Lumix G X Vario PZ 14-42mm f/3.5-5.6 Power O.I.S. Lens (Black), BH #PA144235XB.

Q: 8. Is this lens ver2 or ver3?

A: The Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens with Filter Kit (Micro Four Thirds) is the redesigned replacement of the Lumix G X Vario 12-35mm f/2.8 II ASPH. POWER O.I.S.

Q: 9. Can I use the SmallRig Wireless Follow Focus Lite Kit or any other zoom controller to control the zoom ring on this lens?

A: Yes, you should be able to control the zoom of the Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens (Micro Four Thirds) with the SmallRig Wireless Follow Focus Lite Kit.

Q: 10. Can this record video while plugged in (so it doesn't die)?

A: Yes, it can. Use this Panasonic DMW-AC10 AC Adapter for LUMIX GH4 and GH5 Digital Cameras B&H # PADMWAC10 and this Tether Tools Relay Camera Coupler for Panasonic Lumix Cameras with DMW-BLC12 Battery B&H # TECRPBLC12.