A Tiffen FL-B filter is used to correct the color balance when shooting tungsten film under fluorescent lighting. 

This filter is glass and measures 150 x 150 mm (6x6") x 4 mm thick.

NOTE: The FL series of filters alone does not always guarantee 100% correct color balance when shooting under fluorescent lighting. They are general purpose filters intended for moderate correction and will not, by themselves, necessarily provide perfect color rendition.

An FL-W filter is used to balance daylight film under warm white or white type fluorescent lamps. An FL-D filter is used when you wish to correct for the greenish tone that appears when shooting daylight film under general purpose fluorescent lighting.   

Fluorescent lamps burn at many different temperatures and often require more demanding filtration for exact results. For specific filtration and professional use, it is strongly recommended that a color temperature meter be employed along with Color Correction filters (i.e.CC30M) when shooting under fluorescent lighting. This is the only proven way to achieve exact color correction.

Pleasing skin tones under fluorescent lighting without flash

True-to-life color rendition

Essential in any environment where ambient light source is fluorescent

Related Questions and Answers

Q: 1. Does the effect work with digital cameras? If so, does the auto white balance need to be turned off? Thanks

A: The only useful way to utilize this filter would be if you were shooting in a monochrome mode on a digital camera, or if you had a digital camera that has had an infrared conversion done to it.

Q: 2. Does this gridcloth fabric come with grommets installed on the edges?

A: Yes, the 8x8 Butterfly's all have webbing reinforced edges with grommets installed. Ties are also supplied.

Q: 3. How many stops of lights get lost?

A: The following unit offers a 2.5 light loss.

Q: 4. Is the front of this filter threaded so I can stack another filter to it?

A: Yes

Q: 5. Does this fabric have grommets for tieing to frames?

A: The fabric does have grommets for securing the fabric to a frame.

Q: 6. Has anyone used this filter on an underwater camera? Results?

A: I dont use this filter in underwater camera. See some informations in uwphotographyguide

Q: 7. Hi does this set come with a filter pouch?

A: Yes, the Cavision set of 4x4 Glass Filters comes with a filter pouch.

Q: 8. What volts I can use it's 220v

A: ikan 55W Tungsten Fluorescent Biax Lamp (3000K) BH #IKLFT is a 120V lamp

Q: 9. I bought one of these and in the packaging it says I also need a $300 NS Pro-Mount MkII, in addition to this $260 plastic rectangle to scan my 4x5 negatives. Why is the Pro Mount required? Why can't I simply put this holder on top of NS's 4x5 Light Source?

A: The pro mount helps with the following Provides Level Plane for Scanning Helps with Stability & Precision Also Keeps Film in Place During Image Capture

Q: 10. Does this filter come in a hard plastic case or just a cardboard box?

A: This Tiffen 77mm Water White Glass Full Spectrum IRND 0.9 Filter (3-Stop) would come in a hard plastic case covered by a cardboard box.