Tiffen Decamired Glass Filters - 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 run 4K HDMI into the monitor from camera and 4K SDI out to control board?

A: I'm afraid not. The 4K capabilities for this monitor are limited to the HDMI input only. It does have and SDI input and loop-through, but that is rated at 3G-SDI. It can not handle a 4k signal nor does this unit have cross conversion.

Q: 2. Are the optics of this lens going to be on par with the 12-35mm 2.8 previous gen? That is an amazing lens, but the zoom on this thing is tempting cause 35mm isn't enough.

A: I have both lenses, and the new lens is a bit better. It's equally sharp, with better color rendition and does not cause sun flare to become green and purple blobs.

Q: 3. how would this lens on a Fuji X-T1 compare to a Tamron 150-600 G1 on a Canon 6D. Which would have the better image quality? RegardsKelvin

A: It would be the Fuji lens, IMHO. I had the Tamron lens for awhile, using it on a 7DMkII and I found the images soft. If you want the reach with the 6D, try the Canon 100-400 f/4.5-5.6 II with a 1.4x tc.

Q: 4. Is this lens internal focus?

A: Yes, this lens will internally focus.

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. Is the smooth aperture changes so there are no sudden jumps in exposure compatible with the GH4 ? I got it to work on my GH5 by setting auto-exposure mode and blocked ISO and Shutter Speed, but it doesn't seem to work on my GH4.

A: The Panasonic GH4 when using some of the newer lenses, works better in an "M", or "P" mode.

Q: 7. Will all of automatic the features on this lens work with the JVC Gyls300? And is there a crop factor with this and the JVc?

A: Yes, this lens should work with the LS300's auto focus. The lens is meant to cover a Micro Four Thirds sensor, so it will have a 2x crop factor and be the 35mm equivalent of a 24-120mm lens.

Q: 8. 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: 9. The specs its not indicate if it has constant 2.8 aperture throughout the focal length?

A: It does not have constant 2.8 aperture; the range is 2.8 - 4 and changes gradually as you zoom from 12 to 60 mm. It will maintain constant aperture if you set it to 4 or higher to begin with.

Q: 10. 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.