I was attempting to see how well my father's Pentax 135 mm with a Soligor 2X extender worked on birds. I must say that while I was pleased with the distance, I was ultimately displeased with the amount of abberation I got through the sliding glass door. I will have to try this with a blind, but preferably when it is a tad warmer, for sure. I really love this Pentax glass with my 40D! In any case, I pressed the button a split second too late, at least to miss the tufted titmouse I was aiming at, and instead got this Carolina chickadee! Not bad for a pure accident and some CA.



