The 2-stop, 86mm Tiffen Combination Light Balancing 81EF/ND Filter combines the effects of an 81EF light balancing filter with a neutral density filter. An 81EF filter, the strongest in the 81 series, will more than replace the yellow missing from the image and place all skin tones on a distinctly "warmish" level. Neutral density filters appear gray and reduce the amount of light entering the lens. They have no effect on color balance and are very useful when you want to shoot high-speed film outdoors on a very bright day.

Tiffen's ColorCore glass is produced through a process that entails permanently laminating the filter material in between two pieces of optical glass that are ground flat to tolerances of 1/10,000th of an inch, then mounted in precision aluminum rings. This process makes for greater accuracy of color as opposed to glass that is simply dyed and become subject to deviation during the dye process.

0.6 Optical Density    ColorCore Glass    Black Filter Ring    81EF Adds Significant Warmth to Image    Allows Use of Fast Film in Bright Light    Made in the USA

• Good for general scenics when the photographer wishes to remove the bluish cast from open shade or just add warmth to the photograph, with an 81EF having the greatest effect
  
  81 Series Conversion Factors
• 81 decreases color temperature from 3300 to 3200K
• 81A decreases color temperature from 3400 to 3200K
• 81B decreases color temperature from 3500 to 3200K
• 81C decreases color temperature from 3600 to 3200K
• 81D decreases color temperature from 3700 to 3200K
• 81EF decreases color temperature from 3900 to 3200K

• Enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars
• Decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their backgrounds
• Allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand, or other bright scenes that could cause overexposure
  
  Neutral Density Factors
• ND 0.3 (exposure adjustment = 1 stop, reduces ISO 1/2)
• ND 0.6 (exposure adjustment = 2 stops, reduces ISO 1/4)
• ND 0.9 (exposure adjustment = 3 stops, reduces ISO 1/8)

Related Questions and Answers

Q: 1. What's the rear optic size?

A: This has a 72mm filter thread.

Q: 2. Does it still comes with Sdi/power cable? Thanks

A: When I bought mine the cables did come with the viewfinder

Q: 3. Will this solar filter fit the Nexstar SLT 127? It is advertised as an accessory but in the description is states otherwise.

A: Yes

Q: 4. cant it be used in Schmidt cassegrain telescopes? I am using c5 spottingscope . please clarify.

A: This Solar Filter is designed to work exclusively with the Celestron 127mm and 130mm reflector telescopes.

Q: 5. Is this just a weighted ring or does it have glass which covers the lens? I’m assuming it screws onto the front of the 12mm lens to balance a “rear-heavy” camera setup. The answers to the previous question were not very clear.

A: This is a weighted ring and not a glass filter.

Q: 6. Can the Eye be powered from the Ursa Mini Pro's 4-pin XLR side output (the same one that powers their own viewfinders?)

A: Yes, and here is the cable: Nebtek 4-Pin XLR Male to 2-Pin LEMO Bolt Power Cable (6') B&H # NEBOLTL2XLR4. There is also the option of powering from a d-tap if you wish to use the Eye on another camera that does not have a 4 pin XLR power connection. Zacuto Power & Video Cable (30 ) B&H # ZAZEPVC.

Q: 7. What is the battery, with the built in 15mm rails adapter, featured in the pictures?

A: It is called The Gripper and is made by the British company Hawkwoods. B&H does not have it listed and it does not seem to be currently available yet. a href= http://www.hawkwoods.co.uk/Gripper/ target= _blank http://www.hawkwoods.co.uk/Gripper//a

Q: 8. Can I power the Gratical Eye with my c300 camera only? I don't necessarily want to use external power (ex: anton bauer).

A: The Gratical Eye can ONLY be powered from an 12-16.8 volt external source thru the Lemo 2 pin power input . I don't own a C300 but looking at the specs I do not see a power out on that camera. So a Anton Bauer or similar external battery is must to use this EVF.

Q: 9. I noticed a red shift with ours. If you angle off axis it goes away. Not quite how I want to use it. Anyone witness this?

A: This would be a service issue. If you have had this less than 30 days, please contact B&H Customer Service to see about arranging an exchange or return. B&H Customer Service Contact: https://bhpho.to/2caRE5L. If you have had this longer than 30 days, please contact Zacuto. a href= http://www.zacuto.com/contact-zacuto target= _blank www.zacuto.com/contact-zacuto./a

Q: 10. How is barrel distortion controlled in this adapter? Is it significant or minimal?

A: This is a high quality item that should have minimal barrel distortion present when used with the proper camera and lens.