When it comes to a camera lens filter guide, look no further than this article.
For digital cameras, you’re mainly dealing with UV, Polarizing, and Neutral Density filters.
There are variations of these lens filters, such as a graduated ND filter, but these are the key filter that you would want to use.
And there are plenty of cliched special effect camera filters, but we won’t be covering those in this post.
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We can’t see UV light, it’s invisible to us. But then, why would we want a UV lens filter?
It’s because our cameras can see what our eyes can’t, including UV light. This UV light often appears as a haze, which we really don’t want.
In actuality, this is a problem that affects film shooters, and rarely digital shooters.
Digital sensors are much less sensitive to UV light.
Polarizing filters are really useful, because they reduce glare, and improve the saturation of photos.
The effect created by a polarising filter is one of the only effects that can’t be replicated in post production so it’s important that you own one.
I would say that most people who use a DSLR, should buy a polarizing filter.
There are two types of polarising lens filters; linear and circular. Linear are traditionally used in film photography, whereas circular is used in digital as they’re designed to not confuse the camera’s autofocus.
When you attach the circular filter to the end of your lens, you’ll find that you can still rotate the filter.
This changes the direction that the light is polarised.
When shooting in direct sunlight, you’ll often find that your images come out harsh and feel overexposed. Think of it as being in the sun with no sunglasses on, it’s hard to see.
Polarisers work by only allowing light from a certain direction, which removes the glare from photos.
Of course, there’s more to it than that, read more about them here.
Neutral density filters are used primarily to decrease the shutter speed. The way they work is to reduce the amount of light entering the lens at once, which means that if you want to correctly expose, you need a longer shutter speed.
Why would you want this? Well, sometimes it’s nice to capture movement in your photos, but there’s too much light and the shutter speed is too fast, even with a narrow aperture.
This is where the ND filter comes in. It reduces the amount of light hitting the sensor. This allows you to decrease your shutter speed, without ruining the exposure.
You might also want to capture no movement at all. This can be done when you take a really long exposure, for a few minutes with people passing through the scene.
These lens filters will make your photos look warmer and colder, effectively changing the white balance. They’re basically out of date now, as we can change our white balance as we please.
An FLD (Fluorescent Lighting Daylight) filter is a good example here. This filter type allows the camera to photograph under fluorescent lighting. This is because it gives natural light colours when under poor conditions.
How to Choose a Filter
When it comes to camera filters, you can spend a little or you can spend a lot. If you want quality, you have to pay for it.
I’m of the opinion that you need to invest in the right areas of your gear.
Lenses and filters are definitely where you should be investing. Go for a good name-brand filter, such as Hoya, and buy the best you can afford.
Check the diameter of your lens first, to make sure you order the right size. Some kit lenses are usually 52-58mm in diameter, mine is 72-77mm depending on the lens.
The wider the diameter, the more expensive the filter.
Buy a UV filter. Buy a polarizing filter if you should outdoors in the sun a lot.
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