The Tiffen 6 x 6" Decamired Red 12 Warming 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 this lens works with any Micro Four Thirds System, such as new Blackmagic Pocket Cinema 4K?

A: Yes, the Panasonic Leica DG Vario-Elmarit 12-60mm f/2.8-4 ASPH. POWER O.I.S. Lens should be compatible for use with the Blackmagic Design Pocket Cinema Camera 4K.

Q: 2. Will this camera workfor the mamiya rz67?

A: Yes this tripod would work with the Mamiya RZ67

Q: 3. 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: 4. This claims to have "micro step aperture control." How do you activate it with a Panasonic Lumix G9 II?

A: The Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens (Micro Four Thirds) Micro Step Aperture Control is always available when changing the aperture priority while recording motion pictures. -M.

Q: 5. 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: 6. Why doesn't Panasonic put gear rings on lenses rather that make users install them over the standard rings?

A: The Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens (Micro Four Thirds) is not a cine lens but can be used to capture video. Only cine lenses have a built-in gear ring.

Q: 7. is this 12-60mm truly parfocal lens?I just saw a review that showed it was, but have not yet seen anyone else speak of this or prove also.

A: I am an amateur at best, but, from my understanding of a parfocal lens, I would say yes; it maintains crisp focus while moving from 12 to 60mm with or without the autofocus switched on.

Q: 8. Is this lens compatible with an Olympus PEN Lite E-PL7 camera?

A: Yes Panasonic Leica DG Vario-Elmarit 12-60mm f/2.8-4 ASPH. POWER O.I.S. Lens is compatible with the Olympus PEN E-PL7 Mirrorless Micro Four Thirds Digital Camera

Q: 9. Bit confused, is this is an APS-C lens? If so, what is the equivalent on a full frame camera? (Lumix S5) Thanks !

A: The Panasonic Leica DG Vario-Elmarit 12-35mm f/2.8 ASPH. POWER O.I.S. Lens is a Micro Four Thirds mount lens, which is designed for a smaller sensor than APS-C. The full frame equivalent for Micro Four Thirds is 2x; so the 12-35mm lens will be a 24-70mm full frame equivalent. If you do have an APS-C camera, this lens would not be a viable option.

Q: 10. I've searched web but can't find the leg diameters, does anyone know?

A: MeFOTO states the GlobeTrotter leg diameters are; 16, 19, 23, 27 and 29mm.