I stuck a 2-stop ND filter in front of my lens and increased the exposure to 60 seconds. But cars were still passing by in front of the museum at that hour – blurry but very noticeable. I was able to bypass an annoying problem. I used a 2-stop ND filter to expose the Legion of Honor museum in San Francisco. But you can also use a circular, screw-on filter like this variable ND filter for rent.Ī similar method was used in Figure 3. This holds the glass sheet in front of my lens. The filters I use (which include a 10-stop ND) require a holder or a matte box. This blurred out the choppy bay (Figure 2). Using two stacked ND filters, I was able to increase my shutter speed to make a 30 second exposure. The image shown in Figure 1 of the San Francisco skyline shows a choppy sea. If an object doesn’t stay still in your frame long enough to be properly recorded on the sensor, it’ll either show up as a blur, or, if it’s fast enough, won’t show up at all. You can them to blur motion and make moving objects disappear completely. There’s also another very cool side-effect of using ND filters. The bay was smoothed out with the use of ND filters. They are handy when you want to keep your aperture wide open but can’t go any higher on shutter speed or lower with your ISO.įigure 2. ND filters can be used to control your depth of field while shooting in really bright situations. The same exact thing applies to still photographers. Sometimes you want a really shallow depth of field at high noon. Sometimes you don’t want that small of an aperture and its deep depth of field. You can’t go any lower on ISO or smaller on your aperture. You can pull your ISO down to 100 (or even 50). You can close down your aperture, of course. The low light performance of modern cameras is quite amazing.īut when it comes to too much light (like at high noon), videographers have a problem. For lower-light situations, this is ideal you can shoot with your shutter wide-open and keep jacking your ISO up to get the exposure you want. Learn more about this in An Introduction to Frame Rates, Video Resolutions, and the Rolling Shutter Effect.īottom-line: you have to shoot at a fixed shutter speed, which means you have to control exposure through the use of your aperture and ISO settings. The reason behind this goes back to the old film days and the way the 180º rotating shutter worked on old film cameras. When shooting video, your shutter speed needs to be fixed at either 1/50th of a second (if you’re shooting video at 24 FPS) or 1/60th of a second (if you’re shooting at 30 FPS). At least, not without additional consequences. One thing that confuses a lot of photographers is that in the video world, shutter speed is no longer something you can use to control your exposure. Though, as you’ll see later, this isn’t always the case. It does so without, hopefully, affecting the white balance of your image or adding a color cast. In simple terms, a Neutral Density (ND) filter is a dark piece of glass or resin that cuts down the amount of light coming into your camera. Let’s talk about Neutral Density Filters. There’s been a resurgence in the use of certain filters. With the advent of digital photography and technologies like HDR, the use of filters (especially graduated and colored filters) has fallen off. Back in the film days, they were an indispensable part of the landscape photographer’s toolkit. The use of various filters – physical ones, not the ones in Photoshop – is something that waxes and wanes with time.
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