Converter Question

[brian_wallace5]

<p>I am looking at a 1.4x teleconverter to use with my Sigma 70-200 f/2.8 and to a lesser extent with my Tamron 70-300. I've got it narrowed to four models.</p>

<ul>

<li>Sigma APO Teleconverter 1.4 EX DG</li>

<li>Kenko Teleplus PRO 300 DGX 1.4x</li>

<li>Tamron SP AF 1.4x Teleconverter</li>

<li>Tamron AF 1.4x Teleconverter</li>

</ul>

<p>I know the Sigma would be the "best" model - but its the most expensive and will only work with my Sigma. The Kenko and the Tamron SP are about the same price and work with a variety of lenses but are they that much better than the regular Tamron to justify the cost difference? I am looking for something to use in a pinch as a 300 f/4 just isn't in the picture anytime soon. </p>

[nathangardner]

<p>My friend has the Kenko and I used it a couple weeks ago. I was impressed. Can't comment on the others.</p>

[jack_nordine]

<p>The Kenko is reported to be excellent.</p>

[sanjay_chaudary]

<p>Hi, is it a good idea to use a teleconverter with zooms? I have seen posts recommending usage only with prime lenses.</p>

[arie_vandervelden1]

<p><em>I know the Sigma would be the "best" model - but its the most expensive and will only work with my Sigma.</em></p>

<p>I have this converter and use it with a Canon 200/2.8L. It's a good extender. I've never had a chance to compare it to others, though. I got mine used at keh.com for a nice price.</p>