Teleconverter Help

Started Feb 22, 2014 | Discussions thread
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TRP Contributing Member • Posts: 874
Teleconverter Help

I have surely asked for a great deal of advice lately...

I am trying to decide between four teleconverters that I may be able to get my hands on:

  • Sigma 1.4x (older generation?)
  • Sigma 1.4x APO
  • Tamron 1.5x Pz-AF
  • Kenko 1.5x Px-AF

My targeted lenses for use of the TC would be

  • Sigma 170-500 f/5-6.3
  • Sigma 100-300 f/4
  • Sigma 400 f/5.6 telemacro
  • Tokina 80-400 f/4-5.6

I know that a TC may cause severe IQ reduction in some of these lenses and my ultimate goal would be to only mate it with the 100-300 and 400 telemacro. But alas, I do not own those rare gems yet.

That being said, which TC would be the best for retaining IQ and AF?

I know the sigma lenses tend to work great with a sigma TC, but does the Tamron/Keno outshine?

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Pentax K5
Sigma 8-16 f/4.5-5.6 DC HSM
Pentax SMCP-DA 40 f/2.8 ED Limited Edition
Pentax D-FA 100 f/2.8 Macro WR
Sigma 170-500 5-6.3 Apo Asph F/px-af

Pentax K-5
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