The Sigma 55mm Protector Filter is a simple, clear filter with a 1x filter factor and is designed to provide general protection for your lens. This optically clear filter does not affect overall image quality while helping to prevent dust, scratches, moisture, and other elements from reaching or damaging your lens. This filter is multi-coated which helps to eliminate internal ghosting and reflections.

Sigma Protector filters are constructed from optical glass with a black rim. Set within an aluminum-alloy filter ring that is durable while remaining lightweight, the glass provides increased clarity as well as color fidelity while the black rim further ensures that reflections do not occur along the filter's edge.

Clear Protection Filter    Prevents Damage to Lens    1x Filter Factor, +0 Stop    No Effect on Image    Black Rimmed, Optical Glass Construction    Multi-Coated    Slim Aluminum-Alloy Filter Ring    55mm Front Filter Threads    Knurled Front Edge    Plastic Case

Clear filter offers general protection for your lens against the elements.

Does not require adjustments to exposure while in use.

Multi-coated to help eliminate internal ghosting and reflections.

Creates no additional coloration or contrast.

Constructed from clear, optical glass with a black rim which further ensures that reflections do not occur along the filter's edge.

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

Knurled front edges provide a more textured grip when mounting or removing it from a lens.

55mm front filter threads allow for use with other filters.

Plastic case included for storage and transport.

Related Questions and Answers

Q: 1. Can you attach a lens hood alongside this filter?

A: Yes you can

Q: 2. what is wr stand for?

A: Water resistant

Q: 3. I bought this Canon 58mm UV protector filter for my Canon 58mm EFS 18-55 mm lens and it doesn't fit? It's too small? What size am I supposed to get for this lens? I want to protect it.

A: I bought the fame filter for my Canon 58 EFS 18-55 and it fits very well. I can ever fix over my polarized circular filter.

Q: 4. Does this filter fit the canon ultra wide angle 17-40m USM?

A: The Canon EF 17-40mm f/4L USM lens accepts a 77mm filter. With that said, the B+W 77mm XS-Pro UV Haze MRC-Nano 010M Filter B&H # BWUVXSP77 would be a better choice in terms of size and offers a thinner ring to prevent vignetting. Please see the image below for reference.

Q: 5. Is this the filter for the front of the lens? If so, it must be larger than the "46mm" shown in the title. What size is it?

A: The following filter is a 46mm that is designed and made for the Sigma 500mm f/4 DG OS HSM Sports Lens's filter holder only.

Q: 6. I'm having difficulty opening the case for the first time in which the Sigma 95 mm WR Filter is packed. I've tried twisting it and cannot find any plastic sealant. I would appreciate direction. Suggestions?

A: For the case of the Sigma 95mm WR Ceramic Protector Filter one can turn the top part of the case counter clockwise and then simply pull it off.

Q: 7. Is the front threaded? For protective Cap Storage?

A: Yes, it has a 95mm front thread.

Q: 8. Is there any quality degradation on 150-600mm lens, at focal lenghts beyond 200mm?

A: The Sigma 95mm WR (Water Repellent) Circular Polarizer Filter would have the same effect on the lens at all focal lengths. While adding any optic in front of the optical formula of your lens will have some amount of effect to your lens' image quality, the Sigma 95mm WR (Water Repellent) Circular Polarizer Filter is a high-quality filter, and the benefit of its circular polarizing performance in reducing glare/flare from non-metallic items, increasing contrast/saturation, and deepening the blue hue in the sky (depending on your orientation to the sun) would mitigate any minor negative degradation you would obtain from using the filter on your lens.

Q: 9. Which metal is used for the new Sigma filters?

A: The filter is very new and some information is not out yet. As of now it seems the frame is brass like the other models.

Q: 10. How effective is the hydrophobic treatment? Presumably a titanium oxide coating?

A: Hydrophobic and oleophobic coatings on glass elements and filters such as the Sigma 95mm WR Ceramic Protector Filter (B&H# SICGC95) are typically fluorine-based rather than titanium-based, as the later would block much visible light. It causes most water to bead and roll off if there is any incline to the angle at which the filter is held. When dealing with water droplets and splashes, I have found this type of coating sheds most water without my needing to address it at all. When a water droplet does not roll off right away, I just blow on it to shed it without having to take a break to wipe the lens or filter. I do not need to touch the element at all and I'm immediately back to shooting.