By greatly extending exposure times the Big Stopper blurs anything that is moving in your image, for example clouds, waterfalls, rivers, and the sea.
The filter can also be used on cityscapes to blur people or on roads and motorways to blur traffic.
The Lee Filters Big Stopper Filter is a high quality glass 10 stop neutral density filter.
It reduces the amount of light entering your lens by approximately 10 stops. This allows you to use a much slower shutter speed or wider lens aperture. The Big Stopper has the effect of allowing anything that is moving in your image to become blurred or ghost like, for example clouds, water, rivers, sea etc. The filter can also be used on cityscapes to blur people or on roads to blur traffic for example.
The Lee Filters Big Stopper Filter can be used in conjunction with other filters such as Neutral Density Graduated Filters. Other filters should be set up and positioned in the filter holder as normal before using the Stopper filter. Remember to keep the slot nearest the camera free for the Big Stopper
How to use the Lee Big Stopper.
Before fitting the Big Stopper, compose your image, take a meter reading without the filter in place. Then set your aperture and shutter speed.
Remember to multiply your exposure by a factor of ten. For example, if your meter reads 1/125sec at f/11, this exposure reading would become eight seconds at f/11 with the Big Stopper fitted. If your meter reading suggests an exposure of two seconds at f/11, with the Big Stopper fitted, your exposure becomes 32 minutes.
Insert the Big Stopper into the slot nearest the lens, attach the filter holder as usual and make your exposure.
With long exposures such as these always use a very sturdy tripod, and take care not to knock either the camera or tripod. It may be advisable to cover your viewfinder before releasing the shutter to avoid light encroaching onto the sensor or film.