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Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
Clouds on Tres Cerros and
Mount Fitzroy, Argentinian Patagonia




 
 
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Old 5 Apr 2009
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f2.8 lens fitted with a 2x teleconverter will be useable on all cameras (though you might be restricted to centre AF point).

I have a f4-5.6/75-300 on my Canon 5D, fitted with a 2x teleconverter. OFFICIALLY, the 5D's center AF point only works up to f5.6. But because I fitted a Kenko teleconverter instead of a Canon one, the camera doesn't realize that the converter is there and AF still works. 9 out of 10 shots are in focus, good enough for me.

On a portrait lens (around 100mm), f2.8 is a nice thing to have for shallow depth of field. Other than that, I don't think it matters too much. As I said before: just set the camera to 400 or 800 ASA and you'll be fine (as long as you nail the exposure).

Also: Image stabilization is very nice on those long focal lenghts as it makes composing, panning & framing much easier. I'd DEFINITELY go for a stabilized lens if it's above 200mm.

Bjorn
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