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This is the 4 x 6" Combination Graduated Sunset #3 / Graduated Neutral Density 0.9 Resin Filter from Hitech. Hitech combination filters are like having two filters in one. Often it is necessary or desirable to balance the light intensity in one part of a scene with another. This is especially true in situations where you don't have total light control, as in bright contrasty landscapes. Exposing for the foreground will produce a washed-out, over-exposed sky while exposing for the sky will leave the foreground dark and under-exposed. Hitech Grad ND filters are part clear, part neutral density. They allow the transition to be blended into the scene, often imperceptibly.
This filter provides a 3 stop neutral density factor that can help when special effects like blurs are desired. This is especially effective when photographing running water or traffic where the photographer wishes the movement to be exaggerated within the image. It also allows you to use wider apertures giving you more control over your depth of field. The Sunset portion brings a combination of red, orange and yellow to the image that can transform a run-of-the-mill sunset photo into a real dramatic keeper. The 6" length allows for adjustment of the filter within the holder.
The Hitech filter system is made by Formatt - an English company that is renowned for its high manufacturing standards and consistency of quality. Their CR39 resin is manufactured in large sheets that are oven cured. Their exclusive Absorbing Cell Technology absorbs color as opposed to other filters that are coated. Once cured, they are sliced up to create individual filters. In this way, maximum consistency is maintained from filter to filter. This becomes crucial when you wish to change filters either mid shoot or from day to day.
Some of the Most Popular Applications Include
Adding color excitement to a drab sky
Changing the specific color in a scene to create a desired special effect
Enhancing the existing color or creating subtle color drama
Creating more balanced exposure in uneven lighting conditions
Neutral Density Filters Have Four Main Uses
To enable slow shutter speeds to be used, especially with high speed ISOs, to record movement in subjects such as waterfalls, clouds, or cars
To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background
To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situation
To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure
Hitech filters are made by Formatt, a company with three generations of professional filter-making experience produces every filter to the highest technical standards. The finest materials, together with state of-the-art production technology have resulted in a standard of optical excellence unmatched anywhere else