The Haida 49mm Slim Pro II Circular Polarizer Filterhelps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. The light from the sun naturally becomes partially polarized due to reflecting off electrons in air molecules, causing the light to scatter into what appears as haze. A polarizing filter arranges and filters this directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of this light. This results in a noticeable reduction of glare and reflections from non-metallic surfaces and an increase in the saturation of skies and foliage.

A circular polarizer only differs from a linear polarizer in that it contains a quarter wave plane in addition to the linear polarizing filter. The addition of this quarter wave plane is to circularly polarize the linearly polarized light for the use of auto focus and exposure functions. Due to how the light is broken down and filtered with a linear polarizer, auto focus and exposure accuracy become skewed during use. When the light becomes circularly polarized, it permits the use of these functions.

This filter is constructed from optical glass for clarity as well as color fidelity and features an aluminum-alloy filter ring that can be rotated in order to adjust the intensity of the polarization effect. To prevent internal ghosting and reflections, the glass includes 10 layers of anti-reflection coating. These coatings also offer greater protection to the filter substrate and helps it to stay clean for longer than with uncoated filters.

Circular Polarizer Filter    2.5x Filter Factor, +1.3 Stop    Helps to Eliminate Reflections and Glare    Reduces Haze in Landscapes    Greater Color and Tonal Saturation    Optical Glass Construction    Multi-Coated    Aluminum-Alloy Filter Ring    Thin, Aluminum-Alloy Filter Ring    Plastic Case

Helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface.

Polarizing filters arrange, and filter, directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of the light.

Clears up haze in distant landscapes and provides more saturated, vivid colors.

Strongest effect when used at a 90° angle from the sun.

Circular polarizers are ideal for use with digital cameras and autofocus lenses where a linear polarizer will often disrupt auto exposure and focus features.

2.5x filter factor reduces exposure by 1.3 stops.

Multi-coated to prevent internal ghosting and reflections.

Thin, aluminum-alloy filter ring helps to prevent vignetting while remaining durable and lightweight.

Filter ring can be rotated to adjust the intensity of the polarization effect.

49mm front filter threads allow for use with other filters.

Top knurling to provide a more textured grip when mounting or removing it from a lens.

Constructed from optical glass for clarity and color fidelity.

Plastic filter case for storage and transport.

Related Questions and Answers

Q: 1. can you leave the clear uv filter on and and the polarizer when needed?

A: Yes. If you so desire, you may leave the 82mm UV Slim PRO Filter connected to the filter threads on your lens at all times for use as a protection filter, and you may add the 82mm Circular Polarizer to the filter threads on the front of the 82mm UV Slim PRO Filter when polarization is needed.

Q: 2. Will this fit Canon rf 24-105 f4 lens?

A: Yes this filter kit is compatible with the Canon RF 24-105mm f/4L IS USM.

Q: 3. Does this ND filter work for the canon xf100

A: Yes the Canon XF100 has 58mm diameter filter thread so these filters will fit.

Q: 4. What is the technical difference between the Haida Slim Pro II & Haida NanoPro Circular Polarizer Filters?

A: This Haida NanoPro MC Circular Polarizer has the Nano coating which provides an additional layer that results in an improved beading effect when the surface comes in contact with water or oil, allowing for more efficient cleaning. And it has side knurlings to provide a more textured grip when mounting or removing it from a lens. The Haida Slim Pro II Circular Polarizer does not have the Nano coating or knurling but it is thinner and less likely to vignette when using a wide angle lens.

Q: 5. Did anyone have a hard time attaching this filter to a lens?

A: No issues , see if you have a spec of dust on the threads

Q: 6. Will this fit the Benro FH100M2 Filter Holder? If so, does it need the holder frame?

A: Yes, it will fit and it needs the filter holder frame.

Q: 7. Anyone do some before/after (filter/no filter) with the 24-70 F2.8 II? Since it comes free with the lens, I was just wondering. I'm more of a no filter or B+W user and don't have high hopes for this brand. Hoping to be surprised.

A: These filters are excellent quality. The circular polarizer will work well for cutting glare and intensifying blue skies, and the UV filter will be a good choice for protecting the front element of your lens.

Q: 8. is it compatible with canon 18-135 lens?

A: If you look at the front of the lens, after the focal length and the F stop value there will be a single 2 digit number, that is the size of the filter you need, the number is usually preceeded by a 0 with a slash through it.

Q: 9. is this compatible with a canon rebel t6 camera18-55mm lens?

A: I bought for a nikon camera. I dont own a Canon Rebel 6 but from the specs of the 18-55 mm of your lens it wont be compatible. You need filter with a 58 mm diameter not 52 mm.

Q: 10. Are they multi-coated? I'm asking since their description said YES (wrong description?) but one of reviewers said NO. Thanks.

A: Yes they are multi coated 12 layers, see the specs on the web page..