Is my teleconverter defective?

Started Nov 8, 2013 | Questions thread
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Is my teleconverter defective?
Nov 8, 2013

My Vivitar Series 1 1.4x TC was waiting in the mailbox when I came in this evening. I was playing around with it, but I noticed that it was reporting the full aperture of the lens. As in, I could still get f/1.4 on my FA 50, even though it should only be f/2. It says the focal length is 50mm as well. Perhaps that's why the instructions say to turn off SR. I haven't had time to play with it in decent light to see if it's underexposing The body is a K20d. Is this normal?

P.S. - I didn't buy it to use on the 50. It behaves the same on the A* 300 as well.

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