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PostPosted: Fri Feb 17, 2012 1:05 am 
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Joined: Tue Feb 03, 2009 2:20 am
Posts: 66
Location: Parker, Colorado
I recently bought the EF 1.4x III to use with my 70-200 F/4L IS and they work great together, however, I tried it with my EF 100-400 L and was not overly impressed. I tried the live view magnified in to get the best focus possible and it still was not all that great. I took a lot of test shots of ducks and a couple were ok. I was even shooting at 1/1250, 1/1600 and 1/2000 and at the f8-f13 range.

Has anyone else tried the EF 100-400 L with the EF 1.4x III with any luck?

Thanks

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17-40 F/4L ~ 24-105 F/4L ~ EF 70-200mm f/4L IS ~ Tamron 28-75 f/2.8 ~ EF 50 f/1.4 ~ Lensbaby Composer ~ EF 100-400 L ~ EF 100 F/2.8 Macro ~ EF-S 18-135 ~ EF 24mm f/2.8 IS
EF 1.4x Extender III ~ Speedlite 600RT & 6 430EX II's with PW's ~ Speedlight MR-14EX


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PostPosted: Fri Feb 17, 2012 9:24 am 
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Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9824
Location: UK
Hi chadpope,

The 5D2 will struggle to AF with the 100-400mm lens plus a 1.4x extender (source). Even if the focus is perfect any extender will typically exacerbate optical issues with a lens. But that's just the theory and as I haven't any experience with that combination I'll pass the baton over to others who might...

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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