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DPChallenge Forums >> Photography Discussion >> teleconverter on a zoom lens/
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 12/04/2008 12:01:46 AM · #1
Does anyone use a 1.4 teleconverter on a zoom or are they best used on Primes?
 12/04/2008 12:15:05 AM · #2
I've used a Tamron 1.4 teleonverter with the 50-500 Bigma.

12/04/2008 12:22:48 AM · #3
Originally posted by brimac:
Does anyone use a 1.4 teleconverter on a zoom or are they best used on Primes?

The main issue with teleconverters is the loss of light. A 1.4x TC turns an f/4 lens into a longer f/5.6 lens, and your camera will not autofocus with an aperture smaller than f/5.6 (it'll still work manually). You lose a little sharpness, as you'd expect from any additional glass, but a sharp zoom lens will work fine. This was taken handheld at full zoom with a Canon 70-200 f/4L and 1.4X TC:

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