Both the NiSi Landscape CPL and the Hoya HD CIR-PL are circular polarizing filters that cut glare and deepen skies. The NiSi is built with landscape shooters in mind, while the Hoya HD line is a long-running choice from a maker known for hardened glass and coatings.
What a Circular Polarizer Does
A circular polarizer (CPL) screws onto the front of a lens and rotates. As you turn it, it removes some reflected light from water, wet leaves, rock and glass, and it can deepen blue sky when you shoot at roughly 90 degrees to the sun. It also costs you about one to two stops of light, so shutter speeds get slower.
- It does not work well when you face directly toward or away from the sun.
- On very wide lenses it can leave uneven sky tones.
- It is called circular so that autofocus and metering still work on modern cameras.
How the Two Filters Differ
| Trait | NiSi Landscape CPL | Hoya HD CIR-PL |
|---|---|---|
| Intended user | Landscape and travel shooters | General outdoor and photo use |
| Type | Screw-in circular polarizer | Screw-in circular polarizer |
| Marketing focus | Color accuracy and clarity for scenery | Hardened glass and durable coatings |
| Ring design | Slim ring options for wide lenses | Standard slim-style ring |
These are broad descriptions of how each maker presents its line. Sizes, coatings and ring depth differ by thread diameter, so check each maker’s page for the exact model and your lens size.
Choosing for Your Lens
- Find the filter thread size printed on the front or inside the lens cap, such as 67 mm or 77 mm.
- Buy the filter at that size, or a larger one with a step-up ring if you share it across lenses.
- If you use a wide-angle lens, favor a slim ring to reduce the chance of darkened corners.
- Check whether you also stack a protective or ND filter, since stacking can add vignetting.
Using It in the Field
Mount the filter, look through the viewfinder or screen, and slowly rotate the front ring until reflections fade or the sky deepens. Then leave it there and shoot. As a general guide, expect to raise ISO or lower the shutter speed to make up for lost light. Handheld, a shutter speed of roughly 1/125 or faster is a common comfort level for standard lenses.
Keep the glass clean with a blower and a microfiber cloth, because fingerprints show up as haze in backlit scenes.
FAQ
Do I need a polarizer for digital photography?
Its effect on glare and reflections cannot be copied well in editing, so it is still useful for water, foliage and skies. Many photographers keep one in the bag for those scenes only.
Will it work with a lens hood?
Yes, though on some lenses the rotating ring is harder to reach with the hood attached. Adjust the filter first, then fit the hood carefully so you do not turn the ring.
The Short Version
Choose the NiSi Landscape CPL if you shoot wide scenery and want a design aimed at that work. Choose the Hoya HD CIR-PL if you prefer a well-known all-round filter with a focus on glass hardness. Confirm size and coating details on the maker pages for your lens.
