Complementing this add-on lens, the Sony 21mm Ultra-Wide Conversion Lens with Lens Care Kit from B&H bundles this wide-angle converter lens with a lens cleaning kit.
The 21mm Ultra-Wide Conversion Lens for FE 28mm f/2 Lens from Sony broadens the angle-of-view of the 28mm f/2 lens to 92º for an ultra wide focal length equivalence of 21mm when used with full-frame cameras. As this converter lens is uniquely compatible with the FE 28mm f/2 lens, it transmits EXIF data through the host lens to the camera. The optical design of the converter lens is comprised of 4 elements in 4 groups and when on the 28mm lens, it provides a maximum aperture of f/2.8 and a minimum manual focus distance of 7.9". When the lens is used with an APS-C E-Mount camera, the converter lens provides a 68° angle of view and a 31.5mm focal length equivalent. It is a compact addition to the 28mm lens with a bayonet mount and features a built-in petal-type lens hood.
Keep your optical surfaces clean with the Sensei Deluxe Optics Care and Cleaning Kit. This kit includes a lens cleaning pen, a bulb air blower, a lipstick brush, cleaning fluid, premoistened lens cleaning wipes, a microfiber cloth, cotton swabs, and a durable case with precut foam to hold everything in place. The kit can be used to clean a variety of different optics and glass. Use the air bulb blower, either brush, or the microfiber cloth to initially remove dust from optics surfaces. For more stubborn blemishes and smudges, use the lens pen, premoistened lens cleaning wipes, cotton swabs, or large microfiber cloth.