K-3 + FW Ver 1.02 + Tamron 1.4X Pz_AF

Started Feb 6, 2014 | Discussions thread
garyknrd Contributing Member • Posts: 786
Re: K-3 + FW Ver 1.02 + Tamron 1.4X Pz_AF

I own Pentax and Sigma glass with a 1.4 T.C., also Canon with Canon glass and 1.4 T.C.. As a birder I rarely use either one with a converter. It is just a bad deal. I use the bare lenses only and use the 1.4 with static subjects. But not often.

You loose AF speed, AF accuracy, Degrades the image, and you loose one stop of light. An extremely poor way to get the focal length. I am always amazed at the folks that want these things.

The only lens that i can say is just ok. Is the 300mm Canon lens, not the 300mm 2.8 Sigma. I have never tried the Pentax FA* 300 2.8 but I understand it is excellent. but going from F2.8 to F4.0 is a big deal. Only the best cameras handle it. Even then when the light get lower. It suffers very very bad.

Don't listen to the guys that push these things It is not a good idea.

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Presently living in Asia

 garyknrd's gear list:garyknrd's gear list
Canon EOS 7D Canon EF 500mm f/4.0L IS II USM Canon EF 400mm F4 DO IS II USM
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