Originally posted by sergysergy Thanks nater,
yes, I have been checking the pentax too, but lately it is like $400 and $500
I was asking about he non Pz version of the Kenko because it is much cheaper. I would not mind not being able to use it with other lenses but I would like to make sure it works with the sigma 70-200 (non HSM) and the quality is similar to the sigma.
anyone who has the answer to these questions?
No question that the Kenko 1.5x TC will work with the Sigma 70-200mm non-HSM f/2.8 (I say this because the Sigma 1.4x TC works and that will protrude slightly into the lens and the Kenko does not).
Chances are the Sigma will be better quality for three reasons:
1. Sigma 1.4x is a 5 element TC (Kenko 1.5x is a 4 element)
2. Sigma 1.4x is APO (apochromatic) and should be better corrected against chromatic aberrations (Kenko is not APO)
3. Sigma 1.4x protrudes slightly into lens body (when it's possible to use TCs with this design combined with a telephoto lens the results tend to be better)
How much better will need someone who has tested both TCs with this lens to chime in...