I recently purchased a rather inexpensive wide angle lense on ebay(after buying it, I read something detailing how cheap wideangles with decent appetures aren't any good unless you get a real quality expensive one). I guess later on in life I shall get an expensive wide angle lense, but for now, I just need for figure out what size filters it uses, now the screw mount is quite a bit larger than the 52mm my 50mm, and 35-70mm uses, and still much bigger than my 135mm's 55mm ring. The lense in question is an vivitar 28mm f2.5 non-ai. Markings around the lense are "AUTO Vivitar WIDE-ANGLE 28mm 1:2.5 No.22205427" pictures by ****ty camera phone http://cakerx.tripod.com/misc/28mm-01.jpg http://cakerx.tripod.com/misc/28mm-02.jpg http://cakerx.tripod.com/misc/28mm-03.jpg edit: its a for a nikon, if that helps? anyone know what size filters this thing needs??