Ever photographed a lake and found yourself capturing more glare than water? A circular polarising filter helps cut reflections, bringing out colours and details that would otherwise be hidden.
It's particularly useful for landscapes, travel and outdoor photography. Unlike many colour adjustments, removing reflections with a polariser is something editing software can't fully recreate.
What Does a Circular Polarising Filter Do?
A polariser controls reflected light before it reaches your camera sensor. The difference can be striking, especially outdoors.
- Water and glass: Reduces glare so you can see more clearly through reflective surfaces.
- Skies: Deepens blue tones and makes white clouds stand out.
- Foliage and paintwork: Cuts surface reflections to reveal richer colours.
The effect changes with the light and your shooting angle, so you can adjust it to suit the scene.
Circular vs Linear Polarisers
Both types reduce reflections, but they aren't equally suited to modern cameras. A circular polarising filter includes an additional optical layer that helps maintain compatibility with autofocus and through-the-lens metering systems. Linear polarisers are still used in some specialist optical applications and older camera setups. For most modern digital cameras, a circular polariser is the safer choice.
Getting the Best Effect Outdoors
Using a polariser is straightforward. Rotate its front ring while looking through your viewfinder or at the screen, then stop when the reflections or sky look right.
The effect is strongest when you're shooting roughly 90 degrees to the sun. Point directly towards or away from it and you'll see less change.
Be careful with wide-angle camera lenses. They can capture different angles to the sun across the frame, leaving parts of a blue sky noticeably darker than others.
How a Polariser Affects Exposure
A polariser typically reduces incoming light by around one to two stops. Your camera may compensate with a slower shutter speed or higher ISO.
That matters when photographing moving subjects or shooting handheld in fading light. Remove the filter when you no longer need its effect, particularly indoors or after sunset. For slower shutter speeds in bright conditions, explore neutral density filters.
Choosing the Right Filter Size and Finish
Check the filter thread diameter marked on your lens, usually beside the Ø symbol. This measurement is different from the lens's focal length.
Step-up rings let you use a larger filter on smaller lens threads. Slim or low-profile mounts can also help reduce dark corners on wide-angle lenses.
Multi-coated glass helps control unwanted reflections, while water-repellent coatings make cleaning easier. Browse lens accessories for compatible fittings.
Find Your Polarising Filter at digiDirect
digiDirect carries circular polarising filters from established filter brands, with different diameters, coatings and price points to suit your kit.
Explore the wider range of lens filters or tripods & supports for steadier shooting. Shop Australian stock with applicable warranty coverage, digiDirect's Price Match Guarantee and Click & Collect options depending on availability.
FAQs
Can a polariser be left on the lens all the time?
You can leave it attached, but there's little benefit when reflections aren't a problem. A polariser reduces the light reaching your sensor, which can affect exposure indoors or in low light. Remove it when you don't need the effect.
Can a polariser and an ND filter be used together?
Yes, provided the filters and lens are compatible. A polariser controls reflections, while an ND filter reduces light for longer exposures or wider apertures. Stacking filters can cause vignetting, particularly on wide-angle lenses.
Does a polariser work through a car or aircraft window?
It can reduce some reflections, but results vary with the glass. Toughened or laminated windows may produce rainbow patterns or uneven colours when viewed through a polariser. Rotate the filter and check the image before shooting.
Can the polarising effect be recreated in editing software?
You can adjust colour, contrast and sky tones in editing. However, software can't reliably recover details hidden behind strong reflections in the original photograph. A polariser removes some of that glare before the image is captured.
How should a polarising filter be cleaned?
Start with a blower to remove loose dust and grit. Use a clean microfibre cloth and lens-safe cleaning fluid for fingerprints or smudges. Avoid pressing hard on the rotating ring, and store the filter in its case when not in use.
