Nov 25, 2014 19:35 | #1 Will the 7D paired with the 100-400 and 1.4 converter loose auto focus? I have been drooling over the Sigma 150-600 but its a lot of cash for an extra 200MM. Does anyone have any input as to how I can push my 100-400 to 600MM with good results? Keeping auto focus would be a plus too.
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BigAl007 Cream of the Crop  8,120 posts Gallery: 556 photos Best ofs: 1 Likes: 1682 Joined Dec 2010 Location: Repps cum Bastwick, Gt Yarmouth, Norfolk, UK. More info | Nov 25, 2014 19:54 | #2 Well the 7DII supposedly AF's to f/8 according to the spec sheet, so yes it should work with the 100-400L + 1.4× Converter. How that will compare to either of the Sigma 150-600s or the Tamron is hard to say. From what I have read the 100-400 MKI can be very variable with converters. What the MKII will be like we will have to wait and see, although that will probably be a more expensive option than the Sigma Sport when you add the cost of lens and converter. You also need a 1 series or 5DIII (or already mentioned 7DII bodies to maintain AF. Sigma also suggest that the 150-600 Sport will work with the new Sigma 1.4× converter, while reporting aperture, while on a camera that will AF at f/8. This combination will then get you to 840mm.
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msowsun "approx 8mm"  More info | Nov 26, 2014 06:42 | #3 The 7D Mk I will not AF with a f/8 lens. I have read that even taping the pins doesn't work. Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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KaosImagery Goldmember  1,543 posts Gallery: 31 photos Best ofs: 3 Likes: 1955 Joined Sep 2009 Location: near Saratoga Springs, NY More info | Nov 26, 2014 07:25 | #4 I had a 100-400L for a while that I used with my 7D. I tried a Kenko 1.4x Pro 300DG with that combo and it did not work. I tried taping the pins as msowsun mentions and it did work - but focus was very slow and it hunted all over - in essence, it was unusable for moving objects. It was the middle of winter when I tried this and the light was very flat. It *may* work in really good light. In manual focus, I did get a couple nice shots of the moon though.
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Nov 26, 2014 17:20 | #5 Thats what I thought...Thanks for the confirmation.
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apersson850 Obviously it's a good thing  More info | Nov 27, 2014 15:13 | #6 msowsun wrote in post #17293855  The 7D Mk I will not AF with a f/8 lens. I have read that even taping the pins doesn't work. Oh yes it will. It has the same specification as the 1DX in that particular case. Anders
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DreDaze happy with myself for not saying anything stupid  More info | Nov 27, 2014 15:19 | #7 apersson850 wrote in post #17296451 Oh yes it will. It has the same specification as the 1DX in that particular case. the original 7D doesn't... Andre or Dre
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msowsun "approx 8mm" More info | Nov 27, 2014 15:19 | #8 msowsun wrote in post #17293855 The 7D Mk I will not AF with a f/8 lens. I have read that even taping the pins doesn't work. apersson850 wrote in post #17296451 Oh yes it will. It has the same specification as the 1DX in that particular case. The 7D Mk II does but not the original 7D. Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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