The Tiffen 86mm 81D Light Balancing Filter helps to decrease the color temperature by 500K in order to warm the image slightly in order to match the color quality of illumination. When using an 81D filter, you will be able to attain 3200K balance when the prevailing light source is 3700K. The warming effect of this filter requires a 0.6-stop increase in exposure for normal results.

This filter is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, and then mounting to precision metal rings.

Warming Light Balancing Filter    Less 500K to Convert 3700 to 3200K    ColorCore Technology

Light balancing filter decreases color temperature and provides a warming effect.

Subtracts 500K in order to attain 3200K color balance from 3700K illumination.

Filter factor of 1.5 requires a 0.6-stop increase in exposure.

Related Questions and Answers

Q: 1. Where is this light meter manufactured? Thank you.

A: Currently this meter is manufactured in the PHILIPPINES.

Q: 2. Can the Sekonic L-308XU accurately measure bulb flash output, e.g. press 25 bulbs?

A: The Sekonic L-308X-U Flashmate Light Meter is only capable of measuring within shutter speeds of 60 seconds to 1/8000.

Q: 3. does the meter also calculate contrast ratio in EV like the sekonic 478?

A: Yes it does offer this feature.

Q: 4. In the overview it says, Not designed for photographic work . What in the wide world does that mean? It's a light meter...

A: This meter only measures the intensity of light, it does not provide any information that can be used to set the exposure on a camera (ISO, f/#, etc.).

Q: 5. Does this light meter have any cinema / video related functionality?

A: Yes it has Photo, Cine, and HD Cine Metering Modes

Q: 6. How often should the Sekonic I-346 be sent in for calibration to Sekonic?

A: The I-346 is calibrated in the factory, so it doesn't need to be sent in for calibration on a regular basis.

Q: 7. This meter is used for both incident and reflected light metering purposes. I know that all handheld light meters measure incident light, but I don't understand why this meter is needed for reflected light measurements. The camera's built-in light meter is much quicker and easier to use for a reflected reading. What is the purpose of taking a reflected reading from a handheld light meter?

A: Light meters were designed long before there were meters in any cameras; since some people still like to use a hand-held meter, there was no reason to remove a capability that was already built in.

Q: 8. What size are the background for the studio? One is included a white one right?

A: All the variants of the box have a edge to edge background. A white background is included.

Q: 9. Can this light meter be used with three lights or more?

A: You can measure each light individually and then adjust the output to coincide with your desired lighting ratio.

Q: 10. Is the PC sync connector threaded?

A: It is not threaded.