Formatt Hitech 138mm Unmounted -20 UVAR Filter

Formatt Hitech 138mm Unmounted -20 UVAR Filter

Formatt Hitech 138mm Unmounted -20 UVAR Filter

B&H # FOM20UVAR138 MFR # BF 138CLUVAR-20
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Expected availability: 2-3 business days

Product Highlights

  • Unmounted Underwater UV Filter
  • For Third-Party or Custom Holders
  • Helps Balance Underwater Ambient Light
  • For Depths of 59'.0 to 65.6'
  • 1.25x Filter Factor, +0.3 Stop
  • Schott B270 Glass Construction
  • Multi-Coated
  • 138mm Diameter
  • Plastic Case
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Formatt Hitech BF 138CLUVAR-20 overview

  • 1Description

The Formatt Hitech 138mm Unmounted -20 UVAR Filter is an underwater filter that is designed to absorb ultraviolet light and improve color accuracy at depths of 59'.0 to 65.6'.

Due to its density, water naturally attenuates radiation, including visible light. Lower-energy wavelengths of visible light that are apparent as red, orange, and yellow colors are attenuated more than higher-energy wavelengths of visible light that are apparent as blue, indigo, and violet colors. This further obscures the ability to see red to yellow hues, and can otherwise limit underwater life or objects to appearing only in shades of blue to violet.

Additionally, particles suspended underwater can reflect and scatter ambient sunlight. When this occurs, higher-energy wavelengths within sunlight such as ultraviolet light and visible light that are apparent as violet and blue colors are more easily reflected than lower-energy wavelengths of visible light that are apparent as yellow, orange, and red colors. Together, these particles, along with the ultraviolet, violet, and blue light they are reflecting can obscure details within a scene while further imparting an unwanted bluish cast.

The Formatt Hitech 138mm Unmounted -20 UVAR Filter can help improve the results of underwater images at depths of 59'.0 to 65.6' by effectively absorbing ultraviolet light and reducing visible light that appears as blue and violet. Available red, orange, and yellow light is allowed into an underwater housing and camera, helping to improve color balance throughout the frame.

This filter is constructed from Schott B270 glass for increased optical clarity as well as color fidelity. It is 138mm in diameter and unmounted for use in third-party or custom filter holders. Anti-reflection coatings on the glass prevent internal ghosting and reflections while offering greater protection to the filter substrate, helping it to stay clean for longer than with uncoated filters. When used, the Formatt Hitech 138mm Unmounted -20 UVAR Filter's 0.1 density darkens the entire image by 0.3 stops. This reduction in exposure can be compensated for by adjusting the aperture setting of the lens it is placed on, or the shutter speed of the camera being used.

  • Designed to absorb ultraviolet light and improve the color accuracy of underwater images at depths of 59'.0 to 65.6'
  • Unmounted for use in third-party or custom filter holders for film and television cameras
  • Helps balance levels of visible light while photographing in green or blue-colored, fresh water or salt water
  • Reduces the appearance of visible violet and blue light while allowing available red, orange, and yellow colors into an underwater housing and camera
  • 1.25x filter factor reduces exposure by 0.3 stop
  • Filter density can be compensated for by adjusting lens aperture or camera shutter speed
  • Constructed from Schott B270 Glass for optical clarity
  • Multi-coated to prevent internal ghosting and reflections
  • Plastic case included for storage and transport
UPC: 886235205676
In the Box
Formatt Hitech 138mm Unmounted -20 UVAR Filter
  • Filter Case
  • Table of Contents
    • 1Description

    Formatt Hitech BF 138CLUVAR-20 specs

    Filter Type UV
    Filter Factor 1.25 (+0.3 Stop)
    Shape Circle
    Circular Size 138 mm
    Filter Material Glass
    Ring Material None
    Knurling None
    Coatings Multi-Coating
    Color Temperature Effect Warming

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