UV filter Calumet Ultra Slim 49 mm, multi-coated (24 layers)

The Calumet Ultra Slim 49 mm UV filter is a slim-profile optical accessory designed to suppress ultraviolet light and protect the front element of compatible lenses. With a 49 mm screw thread and a reduced-thickness frame, this UV filter is intended to minimize vignetting when used on wide-angle lenses while preserving color rendering and image clarity. The filter features a multi-coated surface with 24 layers to reduce reflections and ghosting, helping to maintain contrast in bright or hazy shooting conditions without altering exposure settings.

Advantages

The multi-coated 24-layer construction lowers surface reflections and ghosting, improving contrast and color fidelity. The ultra-slim frame reduces the risk of vignetting on wide-angle optics while still offering mechanical protection for the front element against dust, moisture and incidental contact. The neutral UV suppression does not affect color balance, allowing the filter to be left on the lens during general shooting.

Suitable for

• General outdoor and travel photography where lens protection is desired
• Shooting in bright sunlight or hazy conditions to reduce UV-related haze
• Use on wide-angle lenses thanks to the slim profile that minimizes vignetting
• Everyday photography when a neutral, always-on protective filter is preferred

Key specifications

• Filter type: UV (ultraviolet) suppression filter
• Mount thread diameter: 49 mm
• Frame profile: ultra-slim to reduce vignetting on wide-angle lenses
• Coating: multi-coated, 24 layers for reduced reflections and ghosting
• Optical effect: neutral UV cut without significant color shift

How to use

Screw the filter gently onto the front thread of a 49 mm lens until it is secure; avoid overtightening. The filter can remain mounted for general shooting and offers continuous protection and UV suppression. Clean the coated surfaces with a blower, soft brush or microfibre cloth and, if necessary, use lens-cleaning solution designed for coated optics. When stacking filters or using lens hoods, verify that the slim frame does not interfere with accessory clearance.

Usage recommendations

Store the filter in a protective case when not in use to prevent scratches. For optimal optical performance, clean using non-abrasive methods and avoid touching the coating with fingers. If you use additional filters or accessories, check for mechanical vignetting on wide-angle focal lengths despite the slim design.