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The 77mm Multistop Fader Filter from Formatt presents a quality, cost-effective and efficient way to control neutral density effects. This filter is effective when shooting under bright light conditions when you are using high speed ISOs or fast film. By simply rotating the ring on the filter, you can control your exposure up to 8 stops. Neutral density filters appear gray and have no effect on color although Formatt does not recommend using it above 5 stops where some color cast may be present.
This filter is especially valuable to nature and portrait photographers who need control over their depth of field. For the nature shooter, the Multistop Fader will allow you to make longer exposures to create blurs such as when shooting city traffic or waterfalls where you want to capture the motion of the water rather than a dull static shot. Portrait shooters will appreciate this filter since it will give you the freedom to shoot at wider apertures in order to separate your subject from the background - again, when shooting with fast ISOs under bright lighting conditions.
The outer ring of the filter is indexed with reference points that can be used to judge stops. These marking also show minimum and maximum stop loss points. The outer ring is also wider than the rear thread ring and this is deliberate in order to avoid any chance of vignetting (the darkening of the corners of an image).
Formatt filters are manufactured through their proprietary system of Absorbing Cell Technology (A.C.T.) where the CR39 resin is manufactured, color added and then sandwiched between two sheets of high-quality Schott glass. In this way, the color of the filter can be evenly produced, controlled and protected by the glass. This makes it possible to change filters in the middle of a shoot and be assured of color and quality consistency. Edging is perfected through a water jet cutting machine that maintains the highest possible standard for each filter that comes off the assembly line.
The Multistop Fader is made by Formatt, an English company with a 50 year reputation for producing quality filters for film and MPTV.
Manufactured from Queens Award winning CR39 dyed substrate - The resin is cured within the glass using Formatt's bonding process which has been developed over a number of years to eliminate reaction with either the glass or the resin
Absorbing Cell Technology
This process absorbs the color or effect into each cell of the resin rather than coating onto it, ensuring that the color is applied consistently across the filter. This means that each Formatt filter is of the same type can be consistently replicated time after time
Neutral Density Filters Have Four Main Uses
To enable slow shutter speeds to be used, especially with high speed films, 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 overexpos
1 stop: Reduces ISO by 1/2 2 stops: Reduces ISO by 1/4 3 stops: Reduces ISO by 1/8 4 stops: Reduces ISO by 1/16 5 stops: Reduces ISO by 1/32 6 stops: Reduces ISO by 1/64 7 stops: Reduces ISO by 1/128 8 stops: Reduces ISO by 1/256
To use high speed ISOs in bright light Permits use of wider apertures Helps create special effects like blurs