Here’s one example. This is a pic of Grace shot with the DFA 150-450 and the
1.4X converter. I of course wouldn’t have shot this with that combo, but she
wandered into the yard when I was shooting birds, and I think it shows the
vignetting clearly. To me it’s not a problem. Crop mode sacrifices much more of
frame. The camera in AUTO crop chose the crop mode of course because the
converter is an APS-C optic, but I overruled it and went full frame.
http://photo.net/photodb/photo?photo_id=18230104&size=lg
Paul
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