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Teleconverter use with 70-210 f/4 (Beercan)

Started Mar 11, 2006 | Discussions thread
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cyclingchef New Member • Posts: 11
Teleconverter use with 70-210 f/4 (Beercan)

Please excuse my ignorance. The 70-210 is effectively a 105-315 due to the 1.5 crop factor, if I was to use a 2X teleconverter does this lens become a 210-630mm. Is it that simple? Also will the lens remain a constant f/4 ? Finally, I appreciate there has to be some (slight, I hope) loss of quality, would the 2X degrade more than the 1.4X ? Is it now obvious I know very little about teleconverters ? Who's gonna educate me please ?

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