The Tiffen 6 x 4" Decamired Blue 3 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. Is the Olympus M.Zuiko Digital ED 14-42mm lens capable of live Auto focus on BMPCC 4K video recording?

A: This lens will work with the Pocket Cinema Camera 4K's One Touch Auto Focus Feature. The Pocket Cinema Camera 4K does not offer continuous auto focus.

Q: 2. Is the lens par-aperture / parfocal?

A: No, only high end pro cine lenses are par focal.

Q: 3. Is the mount compatible with NexStar SE mount?

A: The Celestron C8-A-XLT CGE 8" f/10 Schmidt-Cassegrain Telescope (OTA Only) uses a larger CGE plate and will not fit in the smaller Vixen style plate that the Nexstar uses.

Q: 4. Will this lens work with the Olympus em10?. I'm looking to use the electronic zoom shortcut on the camera. Looks like this lens is a bit better than the Olympus counterpart. Thanks for reading. David

A: I am not sure.. but your best bet is to call the Camera people to know..compatibility...I used it on Blackmagic pocket camera..even then not all feature did work.. ex. the lens could not be retracted from the control panel...so you see... you need to check with the camera people or go to a user site for that camera.

Q: 5. Can you control the focus, zoom and iris with a remote, or through the ATEM software from Blackmagic?

A: Based on ATEM's website, it appears that if you have this lens mounted to the proper camera, with the switcher below, you should have full control over your IRIS, Zoom, and shutter speed. https://www.blackmagicdesign.com/products/atemcameracontrolpanel

Q: 6. What is the primary mirror wavefront error?

A: The Celestron C8-A-XLT CGE 8" f/10 Schmidt-Cassegrain Telescope (OTA Only) has a 1/4 wavefront error.

Q: 7. hi,do u guys provide international warranty on this product,any suggestions for india if i buy from ur site,...because very few accept international warranty at there service centers...ck

A: While the manufacturer's warranty will be USA only, we offer an extended service plan that provides international coverage, as well as protection against drops, spills, and other incidents through a company called Square Trade. You can find more information about Square Trade here: http://bhpho.to/1fMHaTB

Q: 8. Does this scope have fastar capability? Thank you.

A: Yes. The Celestron C8-A-XLT CGE 8" f/10 Schmidt-Cassegrain Telescope is Fastar compatible.

Q: 9. Has anyone used a remote control unit to zoom this lens?

A: Yes, you could use something along the lines of this: https://www.bhphotovideo.com/c/product/1344165-REG/libec_zc_lp_zoom_control_for_lanc_panasonic.html

Q: 10. Does this lens work well with the Mevo Core camera and associated Multicam app?

A: Yes, the Panasonic Lumix G X Vario PZ 14-42mm f/3.5-5.6 Power O.I.S. Lens (Black) does work well with the Mevo Core UHD 4K Mirrorless Streaming Camera (Micro Four Thirds), B&H # MECORE, and its companion app.