Top Quality: The End Mill Round Top with 2-Flute，Made from HRC55 Carbide with AlTiN Coated that is very tough, resists wear and offers high cutting performan; AlTiN Coating: Titanium aluminum ...

With its classic focal length, fast aperture, and improved coatings, the OM System 17mm f/1.8 II continues to be an excellent option for photographers looking for a high-quality, compact prime lens.