> The larger (67mm) Vivitar earned a mixed reputation. I have no comments on > the 58mm versionm but here are the comments that I have collected for the > 67mm; ignore the comments about barrel distortion--we had this discussion > here last month, and JCO pointed out that lines at the edge of the field > curve because of perspective distortion, not from the "flaw" of barrel > distortion: >
Not true. Pespective distortion causes lines to slope upward or downward at the edges of the frame BUT THEY SHOUL STILL BE STRAIGHT. If any straight lines begin to curve it is inherent geometric distortion and very undesireable. JCO
