So I just picked up a used Canon 2x teleconverter to use with my Canon 70-200 f2.8 and my 1dmkII. Everything works fine but at 400mm I thought I should be getting f4 not f5.6. I heard with the 2x is a 2 stop loss, I'm getting 3 stop loss.
Gottria Member 109 posts Joined Feb 2008 Location: Castro Valley,CA More info | Mar 31, 2008 08:46 | #1 So I just picked up a used Canon 2x teleconverter to use with my Canon 70-200 f2.8 and my 1dmkII. Everything works fine but at 400mm I thought I should be getting f4 not f5.6. I heard with the 2x is a 2 stop loss, I'm getting 3 stop loss. ---------------
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Pete-eos Goldmember  1,999 posts Likes: 2 Joined Jul 2006 Location: SW London UK More info | Mar 31, 2008 08:59 | #2 In short..
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