Teleconverter 1.4x characteristic or faulty?

Started 2 months ago | Questions thread
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MarkMyWords Regular Member • Posts: 226
Teleconverter 1.4x characteristic or faulty?

Just received a new TC 1.4, for use with the 70-300. Initial test shots with the TC show a smearing/distortion at the hard edges (particularly at red arrows, but across much of the image; the effect is obvious when viewed on a computer screen).

The comparison shots (100% crops) below are 1) 300mm with TC to give 420mm, and 2) 300m without TC, image scaled 1.4 for side by side comparison.

It is, unexpectedly and disappointingly, a visibly better result without the TC - do you think the TC is faulty? Thanks.

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