what does a uv filter do on a camera？

A UV protection lens filter is a filter that is installed on the front of the camera lens and its main purpose is to reduce the amount of UV rays entering the camera. This filter is one of the oldest types of photographic filters and is particularly important for film photography because film is sensitive to ultraviolet rays and excessive exposure to ultraviolet rays may cause discoloration in photos. Although digital cameras are less sensitive to UV rays, digital photographers still tend to use this filter to protect the elements at the front of the lens from damage.

Typically, high-quality filters provide near-perfect light transmission and reduce light refraction, thereby maximizing image quality. However, any medium added in front of the lens, no matter how high its optical purity, is likely to cause some degree of image quality degradation, although this degradation is often negligible. High-end UV filters can minimize image noise and other effects such as lens flare, color casts, vignetting or soft focus artifacts, while lower-quality filters can exacerbate these problems. If you are using a high-priced lens, especially in a harsh environment such as a desert, using a UV filter can prevent particles such as sand and dust from damaging the lens. In a studio or indoor environment, using a UV filter may be less necessary. In addition, the premium UV filter is weatherproof, protecting the optical coating on the front element of the lens from dust, extreme temperatures or rain, while preventing lens fogging.

Polyester: Polyester filters are durable, scratch-resistant, and relatively inexpensive. Great for use as a protective lens on action cameras.

Resin: Resin filters have similar protective properties to polyester filters. They are thicker than gel or glass filters and therefore not as efficient. Low quality resin filters can introduce chromatic aberration.

Gel: Gelatin or gel filters are the thinnest filter options available for studio use or in non-extreme environments. They are usually square or rectangular in shape and require a special mount to attach to the front of the lens. Gel filters are paper-thin, which means they cause virtually no noticeable degradation in image quality. The gel also comes in sheet form that can be cut to apply directly to studio lights or windows.

Optical Glass: Optically refined glass is widely used by outdoor and studio photographers because of its low refractive index and efficient light transmission.

Quartz: Fused silica filters produce an extremely low refractive index of 1.46 and provide excellent temperature stability in extreme locations. Quartz filters are inherently scratch-resistant and durable, allowing for more efficient light transmission than traditional glass filters.

49mm MCUV+CPL+ND1000+Adapter Ring Magnetic 4 in 1 Lens Filter Kit Waterproof Scratch-Resistant Anti-Reflection with Filter Pouch

* 【1 Second Swap & Install】 This magnetic lens filter kit could finish installed in less than one second compared with conventional thread filter. Avoided frozen hands in cold weather and never miss any wonderful moment. Combination Way 1：Magnetic Adapter Ring + CPL+ ND1000. Combination Way 2; MCUV+CPL+ND1000.

* 【28 Multi-Layer Coatings】 All filters are made of import AGC High Definition Premium Optical glass, double-side multicoated, no chromatic aberration (color shift) hydrophobic ,scratch resistant , oil proof. Provides you a perfect photography experience, protecting your lens from all round.

* 【Ultra Slim Frame】1.9mm-3.5mm ultra slim frame ensures no vignetting and dark corner on 16mm wide-angle focal length. CNC non-slip system frame , easy for install and remove.

* 【Filters Function】Circular Polarizer (CPL) filter helps reduces glare from non-metallic surface enhance color saturation & contrast. ND1000 filter. ND1000 (10 f-stops) filter helps shoot stunning mesmerizing long exposure. MCUV protection filter with 99.6% transmittance, effectively reduces the reflection came from both the ground and filter itself, ensuring the true color of photos and protect lenses.