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Old Dec 29, 2006, 7:18 PM   #1
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Would Canon 70-300 IS USM non-DO take good sharp pictures with 1.4x TC? How bad it would be wide open with TC?

Also, what TC to use so AutoFocus is not lost?
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Old Dec 29, 2006, 10:07 PM   #2
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harana wrote:
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Also, what TC to use so AutoFocus is not lost?
Any TC will work - you just need to tape up the pins that communicate the lens aperture to the camera
-> Problem is @ f/8 most bodies will have issue with low contrast

Just my humble opinion: the Sigma 100-300 f/4 with the 1.4x is a darn good lens (just check its higher MTF against the 100-400 f/5.6L) and @ 420mm f/5.6 it's still an HSM lens - you do get what you pay for... especially in the built quality of the EX!
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Old Jan 2, 2007, 7:30 PM   #3
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NHL wrote:
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harana wrote:
Quote:
Also, what TC to use so AutoFocus is not lost?
Any TC will work - you just need to tape up the pins that communicate the lens aperture to the camera
-> Problem is @ f/8 most bodies will have issue with low contrast

Just my humble opinion: the Sigma 100-300 f/4 with the 1.4x is a darn good lens (just check its higher MTF against the 100-400 f/5.6L) and @ 420mm f/5.6 it's still an HSM lens - you do get what you pay for... especially in the built quality of the EX!
I have already purchased the Canon 70-300mm IS lens and my photography budget is near dry for nowso I need to be creative. Are there any reviews on how this lensperforms with 1.4x TC?

Also, what TC works well and doesn't cost too much? Canon or Sigma or Kenko or....:-?
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Old Jan 2, 2007, 9:51 PM   #4
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The generic kenko is the least expensive and will 'work' just fine...
http://www.pbase.com/lightrules/image/66901565
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Old Jan 3, 2007, 2:42 PM   #5
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NHL wrote:
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The generic kenko is the least expensive and will 'work' just fine...
http://www.pbase.com/lightrules/image/66901565
Thanks! This is very helpful and much appreciated...
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