> In my opionion most early Pentax and non- > Pentax teleconvertors really aren't worth wasting time with, they often lower > contrast significantly and introduce aberrations such as CA towards the edges > of the frame.
Hi, Rob. As far as I know, the first Pentax TC was the (6-element) T6-2X, and I've had good luck with it - I've had trouble distinguishing its results from those of the (7-element) A 2X-S. Are you referring to this TC, specifically? Fred
