Tamron Adaptall-2 28mm F/2.5 (Model 02B) is a moderate wide angle lens with moderate performance. The extremely compact optical design employs BBAR multi-coating to reduce flare and off-axis coma. This lens is notable for being very compact and lightweight, which may be ideal if you are planning on travelling light. Overall, this lens has a nice fixed focal length wide angle which provides acceptable performance at F/5.6 and at smaller apertures. It has a standard compact non-rotating 49mm filter thread.