The Tiffen 4.5" Round 81 Light Balancing Filterhelps to decrease the color temperature by 100K in order to warm the image slightly in order to match the color quality of illumination. When using an 81 filter, you will be able to attain 3200K balance when the prevailing light source is 3300K. The warming effect of this filter requires a 0.3-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 and grinding flat to a tolerance of 1/10,000th of an inch.

Warming Light Balancing Filter    Less 100K to Convert 3300 to 3200K    ColorCore Technology

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

Subtracts 100K in order to attain 3200K color balance from 3300K illumination.

Filter factor of 1.3 requires a 0.3-stop increase in exposure.

Related Questions and Answers

Q: 1. Does it fit on 67mm?

A: The filter size is "Filter Wheel 3", this is for a drop in system and is not 67mm. To find 67mm Tiffen Fog filters search the B&H website for "Tiffen 67mm Fog"

Q: 2. Does this come with the domed diffuser?

A: Yes, a magnetic dome diffuser is included.

Q: 3. What is the outer diameter of this filter ?

A: According to Tiffen, they state that the 4.5” filters are not threaded, as it is a drop-in style filter made for adapters. As such, the 4.5" size reflects the total size of the filter (which includes the outer diameter) which would fit into a 4.5” holder.

Q: 4. I was wondering if I can mount this on my 90mm smc Pentax lens for my Pentax 67II

A: No, your lens takes a 67mm bayonet filter.

Q: 5. can I use this on fujinon xf 35mm? which should I buy?

A: Not sure which Fuji 35mm lens you have, If you have this XF 35mm F/2, You'll need a 43mm filter. https://www.bhphotovideo.com/c/product/1191420-REG/fujifilm_xf_35mm_f_2_r.html If you have this XF 35mm F/1.4, you'll need a 52mm filter. https://www.bhphotovideo.com/c/product/1505282-REG/fujifilm_xf_35mm_f_1_4_r.html

Q: 6. Is the thread for this filter 0.75mm pitch or 1mm?

A: The thread pitch would be 0.75mm.

Q: 7. Will a 77mm filter fit on a mamiya rz67 90mm lens?

A: 77mm is the correct size for a filter for the Mamiya 90mm f/3.8 C Lens.

Q: 8. Is this the same as the Tiffen Black Promist filters?

A: No, this is not a Black Pro Mist filter. If you are looking for 95mm Black Pro Mist please visit the link below: https://www.bhphotovideo.com/c/search?Ntt=tiffen%20black%20pro%20mist%2095mm&N=0&InitialSearch=yes&sts=ma

Q: 9. Does this low-light version have less of a polarizing effect than the standard?

A: The polarizing effect is the same as other polarizers. Keep in mind this is a linear polarizer and is meant for camera systems which have older exposure metering systems. Mainly used for older film cameras.

Q: 10. Does this tray hold mounted or non-mounted 4.5” round filters?

A: This tray can hold either mounted or non-mounted 4.5" round filters.