uOpt Goldmember  2,283 posts Likes: 3 Joined Jun 2009 Location: Boston, MA, USA More info | Oct 10, 2013 23:02 | #1 I use a 200 f/2.8 II prime and a 70-200 f/2.8 IS2 with the 1.4 and 2.0x Mk III extenders. My imagine composition sucks. I need a heavier lens.
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Oct 10, 2013 23:05 | #2 Teleconverters slow the AF speed of lenses. The 400mm f/5.6L would focus faster than either the 200mm or 70-200mm with the 2x teleconverter. 5D4 | 8-15L | 28-135mm f/3.5-5.6 IS | 24L II | 40mm pancake | 100L IS | 70-200mm f/2.8L IS mk2 | 400mm f/4 DO IS
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edrader "I am not the final word"  More info | Oct 10, 2013 23:10 | #3 uOpt wrote in post #16362072  I use a 200 f/2.8 II prime and a 70-200 f/2.8 IS2 with the 1.4 and 2.0x Mk III extenders. The speed of AF with the 2.x is frustrating. If I were to get a 400 f/5.6 prime, would AF speed improve or am I just screwed until I get a supertele and can go 400mm f/4.0? If I would upgrade, would there be a big difference between a 300mm f/2.8 + extenders and a non-extended f/4.0 or f/5.6? I really dislike TCs. i'd rather crop or just have more environment in my pictures. the 400 f5.6 is very fast focusing. it is a favorite for birders shooting BIF. http://instagram.com/edraderphotography/
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TomReichner "That's what I do."  17,611 posts Gallery: 213 photos Best ofs: 2 Likes: 8358 Joined Dec 2008 Location: from Pennsylvania, USA, now in Washington state, USA, road trip back and forth a lot More info | Oct 11, 2013 00:48 | #4 As Ed and Kawi said, the 400 f5.6 focuses way way way way way way faster than a 200mm with the 2x TC. It's like, half a second instead of 3 or 4 seconds. "Your" and "you're" are different words with completely different meanings - please use the correct one.
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lovemyram4x4 Goldmember  More info | Oct 11, 2013 01:17 | #5 I love TCs on my 300, the 1.4x is fine on the 70-200 but the 2x is just for it's all I have with me but need 400mm. On my 300 the fit on AF/IQ is so small it's hard tell if it was used or not, with the 2x it's a bigger hit but it can just fine for me for things like BIF and motorsports and even though the IQ isn't near what the lens can do naked it's not far off of what a 600mm lens does(I'm sometimes amazed at how sharp many of the shots I've taken with the 2x on are).
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bobbyz Cream of the Crop 20,506 posts Likes: 3479 Joined Nov 2007 Location: Bay Area, CA More info | Oct 11, 2013 08:02 | #6 400mm f5.6 can AF even faster than 300mm f2.8 IS I with 1.4xTC. Fuji XT-1, 18-55mm
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Oct 11, 2013 08:12 | #7 OK, I guess my 2x extender will end up in the marketplace. It's pretty big anyway so the whole affair didn't quite work the way I wanted with weaseling myself into a small bag. Sometimes I'm using extenders on my TS-Es but the 1.4x will do there, too. My imagine composition sucks. I need a heavier lens.
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