What is a Neutral-Density Filter anyway?
In a nutshell, it’s like putting sunglasses on your camera. An ND-filter is a piece of glass that goes between your image and your camera's sensor allowing you to lower the exposure of an image without needing to change your ISO, shutter speed, or aperture.
Why would someone want to cut the light to their camera?
This is a great question! Often we are trying to get as much light as possible to our camera's sensor to lower our ISO, reduce grain, increase our shutter speed, and maximize clarity. However, there are some very common situations where we actually have too much light!
What are the types of ND filters? Is one better than the other?
While there are many different types of ND filters, they all have their place, advantages and disadvantages. Each type of filter should be used for the correct situation and shouldn’t be considered better or worse than the others. However, each type of filter can vary significantly in quality and price.
Solid Filters: A single piece of glass that has been chemically or mechanically altered to resist the passage of light. This is different from Variable filters, which are described below, and utilize two or more pieces of glass to achieve the effect. Solid filters are generally less expensive, but you often have to carry several of them around and swap them regularly to obtain the desired exposure. They can be circular or square/rectangular.
Variable ND Filters:
These filters contain at least 2 pieces of glass that when rotated separately from one another gradually increase or decrease the amount of light going through them. Common VND filters are 2-8 stops or 5-12 stops. These filters are wonderful for their versatility, but are very difficult and costly to make well, and many less expensive VND filters create a lot of color shift, glaring, or ghosting artifacts. The Promaster’s HGX Prime VND filters that The Camera Company sells are a wonderful value, being of high quality, while not being the crazy prices of some manufacturers.
Square/Rectangular Filters: These filters come in various strengths and gradations, but are never variable in nature. They require a special filter holder to be placed in front of the lens either by attaching to the lens itself or by a support system like 15mm rods attached to the camera or tripod baseplate. They come in various sizes and formats but commonly are 75mm, 100mm or 150mm in width. Many of the graduated filters are rectangular so you can slide them up and down in the filter holder to move the gradient across the frame.
Circular Filters: Circular filters come in threaded sizes that screw onto or otherwise attach to the front of a lens. They can be variable or solid. The main advantage over square filters is that they do not need a separate holder to attach to the lens. However, they are generally harder to swap than square filters.
Rear Filters: Some lenses, especially very wide angle lenses and fisheye lenses, tend to have a bulbous front element where putting a filter in front of the lens can be challenging or even impossible. Lens manufacturers create a location at the back of the lens to take filter inserts so you can still use a filter on these lenses. A note of caution with these is that they tend to be proprietary in shape and may require a specific holder, so make sure you check the documentation on your lens to get this set up correctly.
Graduated ND Filters: These filters offer a gradual fade from more to less darkening. It can be very gradual from one end to the other or fairly concentrated towards the center with a dark side and light side. These filters are often used in landscape photography to darken a bright sky but leave the dark foreground alone.
So whether you’re a video shooter wanting a shallow depth of field, or you’re trying to get silky smooth waterfalls, ND-filters are an important and overlooked tool to keep in your camera bag.
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