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PHOTO / Lenses and Filters / Acc. - Filters / Neutral Density Filters

Formatt HiTech

  • Formatt HiTech HT100NDPS30L.jpg
Formatt HiTech Formatt-Hitech Resin ProStop
ND 3.0 Filter (For Lee 100x100mm Holder)

Features Tech Specs

Product Description:

  • Hitech filters are made from the highest quality 1.5mm optical resin.
  • IRND 10 (10-Stops)
  • 100x100mm size (4x4")
  • For LEE Filter Holders
  • CR-39 Dyed Resin

Resin Prostop 3.0 Long Exposure 100x100mm Filter

Formatt-Hitech filters are designed and manufactured in the UK. Formatt-Hitech takes a scientific approach to light modification and designs filters using advanced spectrography to manufacture the most evenly balanced and well matched filters in the world. By using a spectrograph, Formatt-Hitech designs filters of varying density that modify light in the same way, just to varying degrees of intensity. So you can switch from a 0.3ND to a 1.2ND without changing the look of your project. Strict quality standards also mean that if you break a filter today, we can replace it tomorrow with a filter virtually identical across the frequency spectrum. So your 5 piece matched set of ND filters will always remain a matched set of filters, even if one should break and need replacing.


Formatt-Hitech use our award winning and exclusive Absorbing Cell Technology process to dye the resin. The Absorbing Cell Technology process absorbs dye into each cell of the resin rather than coating onto it, ensuring that the affect is applied consistently across the filter. This means that each Formatt filter can be consistently replicated time after time. The densities and formulation of the dying process are strictly computer controlled, creating the most accurate filter reproduction in the world.

Materials Science

Formatt-Hitech's resin was designed specifically for use as a lens material and has an index of refraction nearly identical to the finest optical glass. Formatt-Hitech's resin has the highest scratch resistance of any optical plastic and it is resistant to most solvents, chemicals, aging and material fatigue. Meaning that your resin filter investment will provide many years of good service. Formatt-Hitech's resin is completely transparent to the visible spectrum and opaque to ultraviolet light to eliminate UV contamination on your digital sensor.

Choosing a Filter System

Using a filter holder rather than a circular screw-in filter allows you to make a single filter purchase that is used across a variety of lenses. 85mm filters are an excellent choice for small mirrorless camera systems such as Leica M and Micro Four Thirds systems, or DSLR users with small lenses. The 100mm system is an excellent all-round choice. 100mm filters are popular for DSLR photographers and DSLR cinematographers using larger, more expensive lenses. Typically, most solid filters are square. Graduated filters are rectangular to allow for vertical adjustment of the horizon

Product Description

Neutral Density (or ND) filters produce a grey neutral effect and are used to reduce light in photography, enabling more control over exposure and depth of field without affecting color or contrast. NDs are made in different densities according to the level of light reduction from 1/3 to as much as 10 Stops of light. ProStop filters are a specialist range of high density NDs used to create motion blur in long exposure shots and can help create startling effects in water, cloud and other moving objects. The range is available in densities from 6 to 10 Stops. ProStops include a foam gasket which sits between the filter and the holder to help eliminate light leakage.

CR-39 Dyed Resin
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